Apr. 2023, Research Category,Awards for Science and Technology,The Commendation for Science and Technology by the Minister of Education,,Culture, Sports, Science and Technology, A systematic research for the Matuyama-Brunhes geomagnetic reversal in the Kazusa Group, Ministry of Education, Culture, Sports, Science and Technology
Makoto OKADA;Yusuke SUGANUMA
Japan society

Dec. 2021, 水戸市文化栄誉賞, 学術研究分野, 水戸市
岡田 誠
Others

Sep. 2021, 日本地質学会表彰, 千葉セクションにおける日本初のGSSP認定, 日本地質学会
千葉セクションGSSP提案チーム

Jun. 2021, 日本第四紀学会学術賞, 房総半島の海成第四系を中心とした古地磁気層序に関する一連の研究, 日本第四紀学会
岡田 誠

Jun. 2021, 田中舘賞, 上総層群における松山−ブリュン地磁気逆転の系統的研究, 地球電磁気・地球惑星圏学会
岡田 誠;菅沼悠介

Dec. 2020, つくば賞, 我が国初の地質時代名称「チバニアン」承認の礎となった地磁気逆転および古海洋変動復元に関する研究, 茨城県科学技術振興財団
岡田 誠・菅沼悠介・羽田裕貴
Publisher

Nov. 2020, 茨城県特別功労賞, 日本初の地質年代名「チバニアン」承認（提案チーム代表）, 茨城県
岡田 誠
Others

Oct. 2020, 茨城大学学長学術特別表彰, 国立大学法人 茨城大学
岡田 誠・菅沼悠介・羽田裕貴
Publisher

Aug. 2020, Japan Association for Quaternary Research Merit Award, 日本初のGSSP認定, Japan Association for Quaternary Research
Chiba composite section research community
Japan society

Sep. 2016, 日本地質学会 小藤文次郎賞, 一般社団法人日本地質学会
菅沼悠介・岡田 誠・堀江憲路・竹原真美・木村純一・羽田裕貴・風岡 修
Official journal

Sep. 2006, 日本地質学会論文賞, 一般社団法人日本地質学会
辻 隆司・宮田雄一郎・岡田 誠・三田 勲・中川 洋・佐藤由理・中水 勝
Japan society

Orbital Scale Kuroshio Current Variations of the Northwestern Pacific Ocean in the Early Pleistocene (Marine Isotope Stage 40–36) Based on Calcareous Nannofossil Records
Daisuke Kuwano; Koji Kameo; Yoshimi Kubota; Masayuki Utsunomiya; Kanako Mantoku; Makoto Okada, Last, Abstract

The Quaternary period was marked by distinct glacial‐interglacial climate cycles driven by orbital forcing, which are closely linked to marine environmental change. In the northwestern Pacific Ocean, the subtropical Kuroshio Current and subarctic Oyashio Current play crucial roles in global climate modulation. Despite their significance, paleoceanographic studies with high temporal resolutions are scarce. Here, we investigated calcareous nannofossil assemblages of the Kazusa Group to reconstruct the sea‐surface conditions around the Japanese Archipelago during the marine isotope stage (MIS) 40–36, providing an important climatic record prior to the mid‐Pleistocene transition. A time‐series analysis of nannofossil floral changes revealed orbital scale Kuroshio Current variability as well as Kuroshio Front migrations, suggesting that the Kuroshio Current variations were linked to the variability of the North Pacific subtropical gyre. Moreover, orbital‐scale southward migrations of the Kuroshio Front during the glacial periods may be correlated with the displacement of the intertropical convergence zone caused by the northern hemisphere climate changes. Finally, spectral and wavelet analyses of calcareous nannofossil abundance showed a periodicity of ∼20 Kyr, indicating that these variabilities in the Kuroshio Current are predominantly controlled by high‐latitude climate forcings. Therefore, the results obtained in this study suggest that Kuroshio Current variations are related to climatic changes from low to high latitudes during the MIS 40–36., American Geophysical Union (AGU)
Paleoceanography and Paleoclimatology, 17 Feb. 2025, [Reviewed]

Seasonal Sea Surface Temperature Variations at the Northern Limit of the Kuroshio Current in Marine Isotope Stage 20–18
Hiroto Kajita; Yusuke Suganuma; Yuki Haneda; Makoto Okada; Masanobu Yamamoto; Osamu Seki; Naohiko Ohkouchi, Abstract

This study presents a high time‐resolution alkenone unsaturation ratios (U^K'₃₇) in the Chiba composite section, a marine sedimentary sequence formed in the Kazusa forearc basin in the northwestern Pacific under the influence of the Kuroshio and Oyashio currents. The U^K'₃₇ reflects summer sea surface temperature (SST) and records glacial‐interglacial to sub‐millennial‐scale variations spanning the marine isotope stage (MIS) 19, an analog of our Holocene interglacial. At the glacial‐interglacial scale, summer U^K'₃₇‐SST and previously published winter SST fluctuations are in tandem with East Asian Summer and Winter monsoon variabilities, respectively. Millennial‐scale U^K'₃₇‐SST variations correspond to meltwater events in the North Atlantic. Summer temperature amplitudes maybe half those in winter, suggesting the stable dominance of the Kuroshio Current during the summer and significant winter cooling caused by the Oyashio Current intrusion. Our study reveals the unique seasonally different atmosphere‐ocean coupling system during MIS 19 at the subarctic front in the northwestern Pacific., American Geophysical Union (AGU)
Geophysical Research Letters, 01 Feb. 2025, [Reviewed]

Reconstruction of high-resolution paleomagnetic variations in the middle Gauss chronozone, including the upper and lower boundaries of the Mammoth reversed subchronozone
Akihiro Tanimoto; Makoto Okada; Ryota Hayashi, Abstract

In this study, we provide paleomagnetic records, including the upper and lower boundaries of the Mammoth reversed subchronozone, reconstructed from a continuous outcrop of the upper marine Pliocene in the southernmost part of the Boso Peninsula, which is more than 200 m thick. In this interval, the Mammoth reversed subchronozone was recognized in an interval of approximately 50 m thickness, including a polarity transition zone at its lower boundary of approximately 10 m thickness. Simultaneously, the upper boundary showed no polarity transition zone and a rapid polarity reversal, suggesting a probable lack of strata. Several significant variations were recognized in the paleomagnetic directions in the middle Gauss chronozone, some of which may qualify as new geomagnetic excursions. The relative paleointensities (RPIs) obtained in this study are consistent in their character of change with those reported from deep-sea cores in the distant Caribbean Sea and the equatorial Pacific, indicating the potential of stratigraphic correlation using RPI. The RPI around the lower Mammoth boundary was significantly attenuated compared to the average of the entire section. On the other hand, the virtual geomagnetic pole (VGP) path of the lower Mammoth boundary shows a rapid shift from the southern hemisphere to the northern hemisphere during transition. This movement passes through regions affected by non-axial dipole fields. Following this, the RPI shows a recovery trend, and the VGP stabilizes in the southern hemisphere, forming clusters that align with records from Italy and Hawaii. This sequence offers significant insights into changes in the axial dipole field during geomagnetic polarity reversals.

Graphical Abstract, Springer Science and Business Media LLC
Earth, Planets and Space, 26 Dec. 2024, [Reviewed]

Paleomagnetic study of the 30 ka Aira caldera-forming eruption and 60–45 ka Iwato pyroclastic flow deposits, southern Kyushu, Japan
Takeshi Hasegawa; Nobutatsu Mochizuki; Hidetoshi Shibuya; Ayumu Nishihara; Chie Kusu; Shohei Shibata; Makoto Okada; Kuniaki Nishiki; Yuki Sato, Abstract

To constrain the age and duration of large-scale caldera-forming eruptions, we measured paleomagnetic directions of pyroclastic deposits from the 30 ka Aira caldera eruption sequence, and the 60–45 ka Iwato pyroclastic flow deposits around Aira caldera in southern Kyushu, Japan. The 30 ka Aira caldera eruption sequence consists of Osumi pumice fall (OS), Tarumizu pyroclastic flow deposit (TM), Ito ignimbrite (IT) and co-ignimbrite ash (AT), in ascending order. Oriented samples were collected by drilling for OS, TM and welded ignimbrites, and by cubing for non-welded (unconsolidated) pyroclastic flow deposit. We systematically sampled Ito ignimbrite with the degree of welding as: non-welded (IT1), moderately welded (IT2), and strongly welded (IT3) facies that is limitedly distributed in north of Aira caldera. Mean paleomagnetic directions of OS, TM, IT1 and IT2 are consistent with those previously reported for AT and welded facies of IT. Although OS samples were collected from multiple pumice clasts at proximal locations, we obtained well-defined mean paleomagnetic directions corresponding to those of co-eruptive pyroclastic flow (TM). This suggests that even clast-supported and non-welded pumice fall can retain thermoremanent magnetization at the time of deposition. Significance tests for our mean paleomagnetic directions showed that of all sequential units of the Aira caldera-forming eruption deposits, only IT3 has a different paleomagnetic direction. Based on reported paleosecular variation changing rates in Japan, and on the angular difference associated with error of the two paleosecular directions, we estimate the time gap between IT3 and IT2, to be 24.3 ± 16.3 years. A conductive cooling model explains this time difference as due to differences in cooling time between quickly, and slowly cooled parts of a thick single ignimbrite unit. Although the possibility that multiple flow units occurred within tens of years of each other cannot be excluded, there are no observations of clear flow unit boundaries in the Ito ignimbrite to support the suggestion that the Aira caldera-forming eruption sequence was deposited within a shorter time than years. In addition, the age of Iwato pyroclastic flow deposit, which has been situated between 60 and 45 ka, was estimated by calculating the angular distance between the mean paleomagnetic direction and the modeled secular variation curve from the GGF100 ka. As the result, we determine the most probable age to be around 56 ka.

Graphical abstract, Springer Science and Business Media LLC
Earth, Planets and Space, 18 Dec. 2024, [Reviewed]

Application of a recently developed method of oriented drill coring to accumulative tephra layers: identification of the Matuyama-Brunhes geomagnetic reversal in Akan caldera-forming eruption deposits
Takeshi HASEGAWA; Chie Kusu; Makoto Okada; Aoi Hiratsuka; Kuniaki Nishiki; Yuki Sato; Masaru Koshigai; Takuya Matsuzaki; Yuhji Yamamoto
Earth, Planets and Space, Nov. 2024, [Reviewed]

Paleomagnetic Field Variability and Revised Chronostratigraphy of Bering Sea (IODP Expedition 323) Deep‐Sea Sediments During MIS 6–7 (130–144 ka)
Steve Lund; Emily Mortazavi; Joe Stoner; Makoto Okada, Abstract

We have developed replicate paleomagnetic secular variation (PSV) records for MIS 6–7 (130–244 ka) from IODP Ex. 3 23 Sites 1,343, 1,344, and 1,345 (Bering Sea). We can correlate the PSV at all three sites and identify 90 inclination features and 64 declination features. We have developed relative paleointensity records for all three sites by normalizing the demagnetized natural remanence to magnetic susceptibility. Paleointensity highs/lows can be tied to the PISO‐1500 global oxygen‐isotope‐dated paleointensity record. This provides a significant increase in chronostratigraphic resolution for these sites. Only one excursion is recorded in the MIS 6–7 sediments of the Bering Sea—the Iceland Basin Excursion (∼196 ± 3 ka). Replicate records of the inclinations and declinations both flip quickly to reversed polarity directions, stay there for several hundred years and then flip quickly back to normal polarity directions. However, the inclination flips occur without significant declinations changes and visa versa. A statistical PSV study was carried out by averaging the data in 3 ky and 9 ky windows. There is a distinctive bimodal pattern to the angular dispersions with most time spent with low angular dispersion values (∼10°–15°), but there is an interval of more than 30 ky (185–220 ka) with angular dispersions averaging two to three times higher amplitudes (∼25°–35°). This interval also has low paleointensities and the Iceland Basin Excursion. This same, coupled pattern of high angular dispersion, low paleointensity, and excursions is noted synchronously in the central North Atlantic Ocean and may indicate a global pattern to the geomagnetic field., American Geophysical Union (AGU)
Journal of Geophysical Research: Solid Earth, 23 Oct. 2024, [Reviewed]

On the relationship between paleomagnetic secular variation and excursions – Records from MIS 11 and 12 – ODP Leg 172, western North Atlantic Ocean
Steve Lund; Gary Acton; Brad Clement; Makoto Okada; Lloyd Keigwin, Elsevier BV
Physics of the Earth and Planetary Interiors, 18 Sep. 2024, [Reviewed]

Paleomagnetic secular variation and revised chronostratigraphy of Bering Sea (IODP expedition 323) deep-sea sediments (MIS 5)
Steve Lund; Makoto Okada; Emily Mortazavi, Elsevier BV
Deep Sea Research Part I: Oceanographic Research Papers, Jun. 2024, [Reviewed]

Paleomagnetism and paleomagnetic dating to large volcanic bombs: an example from the historical eruption of Azuma–Jododaira volcano, NE Japan
Takeshi Hasegawa; Bunta Kikuchi; Shibata Shohei; Yuhji Yamamoto; Takumi Imura; Masao Ban; Kae Tsunematsu; Chie Kusu; Makoto Okada; Tsukasa Ohba, Abstract

Vulcanian activity is one of the most common eruption styles of arc andesitic volcanism on Earth. It ejects and deposits volcanic bombs around the source crater. Although paleomagnetic studies of volcanic bombs are limited, such studies can potentially provide more opportunities for high-resolution paleomagnetic dating of volcanic activity. In this study, paleomagnetic dating was applied to large (> 1 m) volcanic bombs around active craters in the Azuma volcano group, NE Japan. Oriented samples were collected from the interior parts of five large volcanic bombs situated on gentle slopes, a few hundred meters from the source crater. More than six core samples were collected from each bomb and all samples were subjected to a range of rock magnetic experiments, including anisotropy of magnetic susceptibility (AMS) and thermal/alternating field demagnetization (THD/AFD) analyses. The Characteristic Remanent Magnetization (ChRM) directions for specimens from all bombs were well-defined, have small α₉₅ (< 2.5º), and are in close agreement with each other. Comparing our measured overall mean direction (D_m = 355.5º, I_m = 49.8º, α₉₅ = 1.6º) with modeled geomagnetic field estimates and a reference secular variation curve for this area (using MATLAB-based archaeomagnetic dating tool), we suggest that the volcanic bombs were produced in the historical Meiji period (1893–1895 CE) eruption. In addition, a combination of the data of ChRM, AMS, thermomagnetic analyses, hysteresis measurement, and XRF analysis indicates that the volcanic bombs were derived from a plug of lava in the conduit under the solidification point (ca. 800 °C), but above the Curie point of the titanomagnetite remanence carrier (around 300 °C). We show that volcanic bombs can be powerful for paleomagnetic dating if certain sampling conditions, such as quantity, situation, size and portion are satisfied.

Graphical Abstract, Springer
Earth, Planets and Space, 16 Nov. 2023, [Reviewed]

Stratigraphic correlation between the lower Pleistocene Chikura Group in the southern part of the Boso Peninsula and the Kazusa Group in the eastern part of the peninsula, based on magneto- and tephro-stratigraphy
Takumi Konishi; Masayuki Utsunomiya; Makoto Okada; Itoko Tamura, The Geological Society of Japan
Journal of the Geological Society of Japan, 31 Oct. 2023, [Reviewed]

Magma had ejected i;CE eruption;Meiji eruption;at Azuma-Jododaira volcano;Fukushima Prefecture;Inferred from paleomagnetic dating for;large volcanic;bombs arou;Tsubakurosawa craters
Takeshi HASEGAWA; Bunta KIKUCHI; Shohei SHIBATA; Takumi IMURA; Masao BAN; Kae TSUNEMATSU; Yuhji YAMAMOTO; Tsukasa OHBA; Kazuma SUZUKI; Atsuharu TOMARU; Chie KUSU; Makoto OKADA
火山, 30 Sep. 2023, [Reviewed]

Multi-method constraints on the age and timescale of silicic small-volume eruptions of Puketerata Volcanic Complex, Taupō Volcanic Zone, New Zealand
Szabolcs Kósik; Takeshi Hasegawa; Martin Danišík; Károly Németh; Makoto Okada; Bjarne Friedrichs; Axel K. Schmitt, Abstract

Accurate dating of young eruptions from explosive volcanoes is essential for forecasting future eruptions and for defining the hazardscape of volcanic fields. However, precise dating of Quaternary eruptions is often challenging due to limited number of applicable dating methods or lack of datable eruptive phases. Moreover, small volume eruptions (e.g., monogenetic type), despite their significance on regional scale, have traditionally deserved less attention than their large volume counterparts. Puketerata is a maar-lava dome complex in the central Taupō Volcanic Zone (New Zealand), encompassing mafic and silicic phreatomagmatic eruptions with well-preserved pyroclastic deposits sourced from closely spaced vents. Its most recent activity is estimated to ca. 16 ka based on medial and distal stratigraphic surveys. Here, we carried out two independent age determinations and an additional paleomagnetic analysis on the volcanic succession of the Puketerata maar-lava dome complex with an aim to unravel the timing of volcanic activity. Combined U-Th disequilibrium and (U-Th)/He dating of zircon from two lava domes yielded eruption ages of 11.3 ± 2.6 ka and 11.3 ± 1.7 ka, which are concordant with the radiocarbon ages of 11.3–11.7 ka obtained on charcoal from the base of the pyroclastic sequence. Paleomagnetic data on the lavas from the two lava domes suggest at least ~ 100 years difference between their emplacements. Our geochronological results and new stratigraphic observations suggest that the volcanic/magmatic history of the Puketerata is complex with multiple eruptions within a small, confined area, where the most recent eruptions occurred only at ca. 11.5 ka, which is significantly younger than previously thought. This provides an additional datum for volcanic hazards assessment and stratigraphic correlations in New Zealand.

Graphical Abstract, Springer Science and Business Media LLC
Earth, Planets and Space, 12 Jul. 2023, [Reviewed]

Rotated Transtensional Basins Formed During Back-Arc Spreading in Japan: Simultaneous Rapid Tectonic Rotation and Basin Subsidence
Hosoi; J.; Tanii; Y.; Okada; M.; Haneda; Y, John Wiley & Sons, Inc.
Tectonics, 27 Jun. 2023, [Reviewed]

Paleomagnetic constraint of the age and duration of the Taupō Eruption, New Zealand
Takeshi Hasegawa; Annika Greve; Darren M. Gravley; Chie Kusu; Yasuaki Kaneda; Shohei Shibata; Makoto Okada; Szabolcs Kósik; Nobutatsu Mochizuki; Gillian Turner
Earth, Planets and Space, Feb. 2023, [Reviewed]

On the relationship between paleomagnetic secular variation and excursions – Records from MIS 9 and 10 - ODP Leg 172
Steve Lund; Gary Acton; Brad Clement; Makoto Okada; Lloyd Keigwin, Elsevier
Physics of the Earth and Planetary Interiors, 26 Mar. 2022, [Reviewed]

Millennial-scale oscillations in the Kuroshio– Oyashio boundary during MIS 19 based,on the radiolarian record from the Chiba composite section, central Japan
Takuya Itaki; Sakura Utsuki; Yuki Haneda; Kentaro Izumi; Yoshimi Kubota; Yusuke Suganuma; Makoto Okada, Last
Progress in Earth and Planetary Science, 12 Jan. 2022, [Reviewed]

Paleoceanography and dinoflagellate cyst stratigraphy across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the Chiba composite section, Japan
Eseroghene J. Balota; Martin J. Head; Makoto Okada; Yusuke Suganuma; Yuki Haneda, A dinoflagellate cyst record from the highly resolved Chiba composite section in Japan has been used to reconstruct sea-surface paleoceanographic changes across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the global stratotype, constituting the first detailed study of this microfossil group from the Pleistocene of the Japanese Pacific margin. Cold, subarctic water masses from 794.2 ka gave way to warming and rapid retreat of the Subpolar Front at 789.3 ka, ~ 2000 years before the end of Marine Isotope Stage (MIS) 20. Throughout the fully interglacial conditions of MIS 19c, assemblages are consistent with warm sea surface temperatures but also reveal instability and latitudinal shifts in the Kuroshio Extension system. The abrupt dominance of Protoceratium reticulatum cysts between 772.9 and 770.4 ka (MIS 19b) registers the influence of cooler, mixed, nutrient-rich waters of the Kuroshio–Oyashio Interfrontal Zone resulting from a southward shift of the Kuroshio Extension. Its onset at 772.9 ka serves as a local ecostratigraphic marker for the Chibanian Stage Global Boundary Stratotype Section and Point (GSSP) which occurs just 1.15 m (= 1300 years) below it. An interval from 770.1 ka to the top of the examined succession at 765.8 ka (MIS 19a) represents warm, presumably stratified but still nutrient-elevated surface waters, indicating a northward shift of the Kuroshio Extension ~ 5 kyrs after the termination of full interglacial conditions on land., Springer Science and Business Media LLC
Progress in Earth and Planetary Science, Dec. 2021, [Reviewed]

Paleoceanography of the northwestern Pacific across the Early–Middle Pleistocene boundary (Marine Isotope Stages 20–18)
Yoshimi Kubota; Yuki Haneda; Koji Kameo; Takuya Itaki; Hiroki Hayashi; Kizuku Shikoku; Kentaro Izumi; Martin J. Head; Yusuke Suganuma; Makoto Okada, Last, Springer Science and Business Media LLC
Progress in Earth and Planetary Science, Dec. 2021, [Reviewed]

A tephra-based approach to calibrating relative geomagnetic paleointensity stacks to absolute values
Nobutatsu Mochizuki; Satomu Fujii; Takeshi Hasegawa; Yuhji Yamamoto; Tadahiro Hatakeyama; Daisuke Yamashita; Makoto Okada; Hidetoshi Shibuya
Earth and Planetary Science Letters, Oct. 2021, [Reviewed]

A record of the lower Mammoth geomagnetic polarity reversal from a marine succession in the Boso Peninsula, central Japan
Yuki Haneda; Makoto Okada,
Palaeomagnetic records from geological archives provide significant information about the nature of geomagnetic polarity reversals; however, there are few detailed palaeomagnetic records of pre-Pleistocene reversals. The lower Mammoth Subchron boundary (late Pliocene) is recorded in a 10-m interval of a marine succession deposited at high accumulation rates (9–66 cm/kyr) in the Boso Peninsula, central Japan. Here, we report a continuous palaeomagnetic record of the lower, normal to reverse boundary interval of the Mammoth Subchron, including the geomagnetic field direction and relative palaeointensity, with an average temporal resolution of ca 800 years. A hybrid method of thermal demagnetization at 200° C and progressive alternating field demagnetization were used to effectively extract the primary palaeomagnetic component, which is carried by magnetite. The lower Mammoth transition is characterized by palaeomagnetic direction of instability and decay of the relative palaeointensity, and occurred from late Marine Isotope Stage MG3 (3351 ka) to MG2 (3336 ka) or MG1 (3331 ka), spanning 15–20 kyr. Virtual geomagnetic poles (VGPs), calculated from primary palaeomagnetic directions, rapidly rebounded twice from southern latitudes to northern latitudes within the transition. In contrast to the complex lower Mammoth reversal behavior recorded in the Boso Peninsula succession, records from a lava sequence in O'ahu (Hawai'i) reveal a rebound following a 180° directional change, and those from a marl succession in Sicily (Italy) indicate a single rapid directional change. Diverse geomagnetic field evolution among these three sections is reflected resolution difference among the records likely in combination with an influence of non-axial dipole field., Oxford University Press (OUP)
Geophysical Journal International, 02 Sep. 2021, [Reviewed]

Formal ratification of the Global Boundary Stratotype Section and Point (GSSP) for the Chibanian Stage and Middle Pleistocene Subseries of the Quaternary System: the Chiba Section, Japan†
Yusuke Suganuma; Makoto Okada; Martin J. Head; Koji Kameo; Yuki Haneda; Hiroki Hayashi; Toshiaki Irizuki; Takuya Itaki; Kentaro Izumi; Yoshimi Kubota; Hiroomi Nakazato; Naohisa Nishida; Masaaki Okuda; Yasufumi Satoguchi; Quentin Simon; Yoshihiro Takeshita
Episodes, 01 Sep. 2021, [Reviewed]

On the relationship between paleomagnetic secular variation and excursions – Records from MIS 6 and 7 - ODP Leg 172
Steve Lund; Gary Acton; Brad Clement; Makoto Okada; Lloyd Keigwin, Elsevier BV
Physics of the Earth and Planetary Interiors, Sep. 2021, [Reviewed]

Marker Tephra Layers Indicating the Lowest Part of the Quaternary System Found in the Moroyama Hills and Kawajima Core, Western Kanto Plain, Central Japan
Tomonori NAYA; Makoto OKADA; Akira FURUSAWA; Kiyohide MIZUNO, Tokyo Geographical Society
Journal of Geography (Chigaku Zasshi), 25 Jun. 2021, [Reviewed]

Rock magnetic variability of quaternary deep-sea sediments from the Bering Sea and their environmental implications
Steve Lund; Emily Mortazavi; Ellen Platzman; Matt Kirby; Joe Stoner; Makoto Okada, Elsevier BV
Deep Sea Research Part I: Oceanographic Research Papers, Jun. 2021, [Reviewed]

On the relationship between palaeomagnetic secular variation and excursions—records from MIS 8–ODP Leg 172
Steve Lund; Gary Acton; Brad Clement; Makoto Okada; Lloyd Keigwin,
Palaeomagnetic secular variation (PSV) and excursion data obtained across MIS 8 (243–300 ka) from the western North Atlantic Ocean ODP (Ocean Drilling Program) sites 1060–1063 show composite high-resolution PSV records (both directions and relative palaeointensity) developed for each site and intercompared. Two methods of chronostratigraphy allow us to date these records. First, we used published results that compared the calcium carbonate records of ODP Leg 172 sediments and tuned them with Milankovich cyclicity. We also compared our palaeointensity records with the PISO-1500 global palaeointensity record that was dated with oxygen isotope stratigraphy. We prefer the PISO-1500 record to date our cores. Two excursions are preserved in our PSV records—Excursions 8α and 9α. Our revised age estimates for both excursions are 8α (236.7–239.8 ka) and 9α (283.7–286.9 ka). We have compared shipboard measurements of the two excursions with u-channel measurements of selected excursion intervals. Excursion 8α is interpreted as a ‘Class II’ excursion (local reversal) with in-phase inclination and declination changes; Excursion 9α is a ‘Class I’ excursion with 90° out-of-phase inclination and declination changes. Averaged directions (after removal of true excursional directions) and relative palaeointensity in 3 and 9 ka overlapping intervals show significant PSV directional variability over 104 yr timescales that is regionally correlatable among the four sites. A notable pattern of angular dispersion variability involves most time spent with low (∼10°) dispersion, with three shorter intervals of high (∼25°) dispersion. The relative palaeointensity variability also shows significant variability over 104 yr timescales with three notable intervals of low palaeointensity in all four records and a direct correspondence between the three low-palaeointensity intervals and the three intervals of high angular dispersion. The two magnetic field excursions occur in two of the three low-palaeointensity/high-dispersion intervals. This suggests that the geomagnetic field operates in two states between reversals, one with regular to high palaeointensity and low directional variability and one with low palaeointensity and significantly higher directional variability and excursions., Oxford University Press (OUP)
Geophysical Journal International, 11 Mar. 2021, [Reviewed]

Multiproxy sedimentological and geochemical analyses across the Lower–Middle Pleistocene boundary: chemostratigraphy and paleoenvironment of the Chiba composite section, central Japan
Kentaro Izumi; Yuki Haneda; Yusuke Suganuma; Makoto Okada; Yoshimi Kubota; Naohisa Nishida; Moto Kawamata; Takuya Matsuzaki, Springer Science and Business Media LLC
Progress in Earth and Planetary Science, 22 Jan. 2021, [Reviewed]

Correction to: Calcareous nannofossil biostratigraphy of the Lower–Middle Pleistocene boundary of the GSSP, Chiba composite section in the Kokumoto Formation, Kazusa Group, central Japan, and implications for sea-surface environmental changes (Progress in Earth and Planetary Science, (2020), 7, 1, (36), 10.1186/s40645-020-00355-x)
Koji Kameo; Yoshimi Kubota; Yuki Haneda; Yusuke Suganuma; Makoto Okada, Springer
Progress in Earth and Planetary Science, 01 Dec. 2020

Calcareous nannofossil biostratigraphy of the Lower–Middle Pleistocene boundary of the GSSP, Chiba composite section in the Kokumoto Formation, Kazusa Group, central Japan, and implications for sea-surface environmental changes
Koji Kameo; Yoshimi Kubota; Yuki Haneda; Yusuke Suganuma; Makoto Okada, Springer Science and Business Media LLC
Progress in Earth and Planetary Science, Dec. 2020, [Reviewed]

A full sequence of the Matuyama-Brunhes geomagnetic reversal in the Chiba composite section, Central Japan
Haneda, Y; Okada, M; Suganuma Y; Kitamura, T, Springer
Progress in Earth and Planetary Science, 01 Sep. 2020, [Reviewed]

A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from the transitional geomagnetic fields
Konishi, T; Okada, M, Corresponding, Springer
Progress in Earth and Planetary Science, 08 Aug. 2020, [Reviewed]

Millennial-scale hydrographic changes in the northwestern Pacific during marine isotope stage 19: teleconnections with ice melt in the North Atlantic
SUGANUMA Yuusuke
Earth and Planetary Science Letters, Jan. 2020, [Reviewed]

High-resolution 10Be and paleomagnetic recording of the last polarity reversal in the Chiba composite section: Age and dynamics of the Matuyama–Brunhes transition
Quentin Simon; Yusuke Suganuma; Makoto Okada; Yuki Haneda, Elsevier BV
Earth and Planetary Science Letters, Aug. 2019, [Reviewed]

Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications
Haneda, Y; Okada, M, Springer
Progress in Earth and Planetary Science, 21 Jan. 2019, [Reviewed]

A summary of the Chiba Section, Japan: a proposal of Global Boundary Stratotype Section and Point (GSSP) for the base of the Middle Pleistocene Subseries
菅沼悠介; 菅沼悠介; 羽田裕貴; 林広樹; 本郷美佐緒; 堀江憲路; 兵頭政幸; 五十嵐厚夫; 石塚治; 入月俊明; 板木拓也; 泉賢太郎; 亀尾浩司; 川又基人; 川村賢二; 木村純一; 小島隆宏; 久保田好美; 中里裕臣; 西田尚央; 岡田誠; 荻津達; 奥田昌明; 奥野淳一; 里口保文; 仙田量子; SIMON Quentin; 末吉哲雄; 紫谷築; 菅谷真奈美; 竹下欣宏; 竹原真美; 渡邉正巳; 八武崎寿史; 吉田剛
地質学雑誌, 15 Jan. 2019, [Reviewed]

Corrigendum to “Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early–Middle Pleistocene Subseries boundary” (Quaternary Science Reviews (2018) 191 (406–430), (S0277379117302251) (10.1016/j.quascirev.2018.04.022))
Suganuma, Y.; Haneda, Y.; Kameo, K.; Kubota, Y.; Hayashi, H.; Itaki, T.; Okuda, M.; Head, M.J.; Sugaya, M.; Nakazato, H.; Igarashi, A.; Shikoku, K.; Hongo, M.; Watanabe, M.; Satoguchi, Y.; Takeshita, Y.; Nishida, N.; Izumi, K.; Kawamura, K.; Kawamata, M.; Okuno, J.; Yoshida, T.; Ogitsu, I.; Yabusaki, H.; Okada, M.
Quaternary Science Reviews, 2019

Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early–Middle Pleistocene Subseries boundary
Yusuke Suganuma; Yuki Haneda; Koji Kameo; Yoshimi Kubota; Hiroki Hayashi; Takuya Itaki; Masaaki Okuda; Martin, J. Head; Manami Sugaya; Hiroomi Nakazato; Atsuo Igarashi; Kizuku Shikoku; Misao Hongo; Masami Watanabe; Yasufumi Satoguchi; Yoshihiro Takeshita; Naohisa Nishida; Kentaro Izumi; Kenji Kawamura; Moto Kawamata; Jun’ichi Okuno; Takeshi Yoshida; Itaru Ogitsu; Hisashi Yabusaki; Makoto Okada, Last
Quaternary Science Reviews, Jul. 2018, [Reviewed]

Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan
Makoto Okada; Yusuke Suganuma; Yuki Haneda; Osamu Kazaoka, Lead
Earth, Planets and Space, Dec. 2017, [Reviewed]

Chronostratigraphy of the Pliocene-Pleistocene boundary in forearc basin fill on the Pacific side of central Japan: Constraints on the spatial distribution of an unconformity resulting from a widespread tectonic event
Masayuki Utsunomiya; Chie Kusu; Ryuichi Majima; Yuichiro Tanaka; Makoto Okada, Last
QUATERNARY INTERNATIONAL, Oct. 2017, [Reviewed]

Millennial-scale northern Hemisphere Atlantic-Pacific climate teleconnections in the earliest Middle Pleistocene
Masayuki Hyodo; Balazs Bradak; Makoto Okada; Shigehiro Katoh; Ikuko Kitaba; David L. Dettman; Hiroki Hayashi; Koyo Kumazawa; Kotaro Hirose; Osamu Kazaoka; Kizuku Shikoku; Akihisa Kitamura
SCIENTIFIC REPORTS, Aug. 2017, [Reviewed]

CONNECTING MARINE AND ON-LAND PALEOINITENSITY STUDIES
Hidetoshi Shibuya; Nobutatsu Mochizuki; Takeshi Hasegawa; Makoto Okada, Geological Society of America
Geological Society of America Abstracts with Programs, 2017

Stephanodiscus akutsui, a new fossil diatom species from the Middle Pleistocene Miyajima Formation, Shiobara Group, Tochigi Prefecture, central Japan
Kojima; T.; Saito-Kato; M.; Okada; M., The Japanese Society of Diatomology
Diatom, 31 Dec. 2016, [Reviewed]

A record of the upper Olduvai geomagnetic polarity transition from a sediment core in southern Yokohama City, Pacific side of central Japan
Chie Kusu; Makoto Okada; Atsushi Nozaki; Ryuichi Majima; Hideki Wada
Progress in Earth and Planetary Science, Dec. 2016, [Reviewed]

Calcareous nannofossil biochronology from the upper Pliocene to lower Pleistocene in the southernmost Boso Peninsula, central part of the Pacific side of Japan
K. Kameo; M. Okada
JOURNAL OF ASIAN EARTH SCIENCES, Nov. 2016, [Reviewed]

Sedimentary processes and depositional environments of a continuous marine succession across the Lower-Middle Pleistocene boundary: Kokumoto Formation, Kazusa Group, central Japan
Naohisa Nishida; Osamu Kazaoka; Kentaro Izumi; Yusuke Suganuma; Makoto Okada; Takeshi Yoshida; Itaru Ogitsu; Hiroomi Nakazato; Shun Kameyama; Atsushi Kagawa; Masaaki Morisaki; Hisashi Nirei
QUATERNARY INTERNATIONAL, Mar. 2016, [Reviewed]

High resolution stratigraphy across the early-middle Pleistocene boundary from a core of the Kokumoto Formation at Tabuchi, Chiba Prefecture, Japan
Masayuki Hyodo; Shigehiro Katoh; Akihisa Kitamura; Kenta Takasaki; Hayato Matsushita; Ikuko Kitaba; Ikuko Tanaka; Masakazu Nara; Takuya Matsuzaki; David L. Dettman; Makoto Okada
QUATERNARY INTERNATIONAL, Mar. 2016, [Reviewed]

Paleomagnetic field variability and chronostratigraphy of Brunhes-Chron deep-sea sediments from the Bering Sea: IODP Expedition 323
Steve Lund; Joseph Stoner; Makoto Okada; Emily Mortazavi
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, Mar. 2016, [Reviewed]

Quantitative paleoclimate reconstruction based on a 130 ka pollen record from the C9001C core off NE Japan
Manami Sugaya; Masaaki Okuda; Makoto Okada, Last
QUATERNARY INTERNATIONAL, Mar. 2016, [Reviewed]

Stratigraphy of the Kazusa Group, Boso Peninsula: An expanded and highly-resolved marine sedimentary record from the Lower and Middle Pleistocene of central Japan
Osamu Kazaoka; Yusuke Suganuma; Makoto Okada; Koji Kameo; Martin J. Head; Takeshi Yoshida; Manami Sugaya; Shun Kameyama; Itaru Ogitsu; Hisashi Nirei; Nobuyuki Aida; Hisao Kumai
QUATERNARY INTERNATIONAL, Oct. 2015, [Reviewed]

Spatial distribution of pollen assemblages in surface sediments on the Okhotsk Sea basin floor
Sugar; M; Okada.; M; Okada; M; Sakamoto; T, 日本地質学会
Journal of Geological Society of Japan, Oct. 2015, [Reviewed]

Early to Middle Miocene rotational tectonics of the Ou Backbone Range, northeast Japan
Jun Hosoi; Makoto Okada; Tomohiro Gokan; Kazuo Amano; Andrew James Martin
ISLAND ARC, Sep. 2015, [Reviewed]

Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra
Yusuke Suganuma; Makoto Okada; Kenji Horie; Hiroshi Kaiden; Mami Takehara; Ryoko Senda; Jun-Ichi Kimura; Kenji Kawamura; Yuki Haneda; Osamu Kazaoka; Martin J. Head
GEOLOGY, Jun. 2015, [Reviewed]

An integrated chronostratigraphy in the Anno Formation, Awa Group, middle part of the Boso Peninsula, central Japan, based on data from paleomagnetic and oxygen isotopic analyses
Haneda Yuki; Okada Makoto, The Geological Society of Japan
Annual Meeting of the Geological Society of Japan, 2015

三浦半島北部の上総層群中部（下部更新統）で掘削されたコアの堆積相とオルドバイ正磁極亜帯の上限
楠 稚枝; 野崎 篤; 岡田 誠; 和田秀樹; 間嶋隆一
地質学雑誌, Feb. 2014, [Reviewed]

前期〜中期中新世における東北日本弧内テクトニクス
細井 淳; 岡田 誠; 後閑友裕; 天野一男, 日本堆積学会
堆積学研究, Dec. 2013, [Reviewed]

房総半島南端千倉層群における鮮新統−更新統境界層準の古地磁気-酸素同位体複合層序
岡田 誠; 所 佳実; 内田剛行; 荒井裕司; 斉藤敬二, Lead, We propose a refined chronostratigraphy for the middle section of the Chikura Group, containing the Plio-Pleistocene boundary, from the southernmost part of the Boso Peninsula, Japan, based on magnetostratigraphy and oxygen isotopic stratigraphic analysis of benthic foraminifers. The stratigraphic interval examined here correlates with the chronostratigraphic interval from the upper Gauss chronozone, including the Kaena sub-chronozone, to the lower Matuyama chronozone. Our chronostratigraphic interpretation strongly suggests that the presently defined stratigraphic interval represents LR04 marine isotope stages (MIS) G16 to 93. The Matuyama—Gauss boundary present within the studied sequence is not within MIS 104, as is described in the LR04 time scale, but is in MIS 103. This interpretation is consistent with that of the boundarys stratigraphic horizon as reported in Mediterranean sapropel stratigraphy., The Geological Society of Japan
地質学雑誌, Feb. 2012, [Reviewed]

Coupled organic and inorganic carbon cycling in the deep subseafloor sediment of the northeastern Bering Sea Slope (IODP Exp. 323)
Laura M. Wehrmann; Nils Risgaard-Petersen; Heather N. Schrum; Emily A. Walsh; Youngsook Huh; Minoru Ikehara; Catherine Pierre; Steven D'Hondt; Timothy G. Ferdelman; Ana Christina Ravelo; Kozo Takahashi; Carlos Alvarez Zarikian
CHEMICAL GEOLOGY, May 2011, [Reviewed]

IODP Expedition 323-pliocene and pleistocene paleoceanographic changes in the Bering Sea
Kozo Takahashi; A. Christina Ravelo; Carlos Alvarez Zarikian
Scientific Drilling, Mar. 2011, [Reviewed]

Expedition 323 summary
K.Takahashi; A.C.Ravelo; C.A.Zarikaian; and the Expedition 323 Scientists: Ivano Aiello; Hirofumi Asahi; Gretta Bartoli; Beth Caissie; Muhong Chen; Elena Colmenero-Hidalgo; Mea Cook; Kelsie Dadd; Gilles Guèrin; Katrine Husum; Akira Ijiri; Sev Kender; Douglas LaVigne; Tanzhuo Liu; Steve Lund; Christian März; Alan Mix; Maheswar Ojha; Makoto Okada; Yusuke Okazaki; Jonaotaro Onodera; Taou␣k Radi; Tatsuhiko Sakamoto; David Scholl; and Zuzanna N. Stroynowski)
Proc. IODP, 2011, [Reviewed]

Description of basement volcanic sequences in Holes U1342A and U1342D on Bowers Ridge in the Bering Sea
H. Kawabata; K. Sato; Y. Tatsumi; D.W. Scholl; K. Takahashi; and the Expedition 323 Scientists
Proc. IODP, 2011, [Reviewed]

Data report: site surveys in the Bering Sea for Integrated Ocean Drilling Program Expedition 323 (as part of IODP Proposal 477)
T. Sakamoto; K. Takahashi; K. Iijima; Y. Kido; F. Yamamoto; T. No; T. Tsuru; U. Suzuki; M. Okada; Y. Okazaki; H. Tokuyama and A. Taira
Proc. IODP, 2011

Age model, physical properties and paleoceanographic implications of the middle Pleistocene core sediments in the Choshi area, central Japan
Koji Kameo; Makoto Okada; Moamen El-Masry; Toshio Hisamitsu; Saneatsu Saito; Hiroomi Nakazato; Naohiko Ohkouchi; Minoru Ikehara; Hisato Yasuda; Hiroshi Kitazato; Asahiko Taira
ISLAND ARC, Sep. 2006, [Reviewed]

Magnetostratigraphy of the Miocene Chiang Muan Formation, northern Thailand: Implication for revised chronology of the earliest Miocene hominoid in Southeast Asia
Y. Suganuma; T. Hamada; S. Tanaka; M. Okada; H. Nakaya; Y. Kunimatsu; H. Saegusa; S. Nagaoka; B. Ratanasthien
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, Sep. 2006, [Reviewed]

The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years
NP Ratnayake; N Suzuki; M Okada; M Takagi
CHEMICAL GEOLOGY, Apr. 2006, [Reviewed]

Congener-specific carbon isotopic analysis of 18 PCB products using two dimensional GC/IRMS
Y Horii; G Petrick; M Okada; K Amano; T Katase; T Gamo; N Yamashita
BUNSEKI KAGAKU, May 2005, [Reviewed]

二次元ガスクロマトグラフ/同位体比質量分析計を用いる18種のポリ塩化ビフェニル製品の異性体別炭素同位体比分析
堀井勇一; Gert Petrick; 岡田 誠; 天野一男; 片瀬隆雄; 蒲生俊敬; 山下信義, 世界各国から収集した18種類のPCB製品を，二次元GC/C/IRMSを用いて異性体別の炭素同位体分析を行い，その同位体比分布とPCB組成との関係を明らかにし，産出国による同位体比分布の違いを見いだした。担当部分：同位体分析法および同位体比と組成の関係に関する議論の指導
分析化学, 2005, [Reviewed]

房総半島に分布する下部更新統上総層群大田代層と梅が瀬層の高精度堆積年代ー石油公団研究井TR-3コアの酸素同位体比・古地磁気・石灰質ナンノ化石に基づく年代層序
辻 隆司; 宮田雄一郎; 岡田 誠; 三田 勲; 中川 洋; 佐藤由理; 中水 勝, 石油公団によって，房総半島上総層群梅ヶ瀬層下部〜大田代層で掘削された堆積岩コアの古地磁気・酸素同位体測・石灰質ナノ化石層序・火山灰層序により，詳細年代層序を構築した．これにより，梅ヶ瀬層下部がMIS27-28にあたり，大田代層の最上部がMIS29の間氷期にあたることがわかった．担当部分：古地磁気層序, The Geological Society of Japan
地質学雑誌, Jan. 2005, [Reviewed]

Chronostratigraphy of sediment cores from the Bering Sea and the subarctic Pacific based on paleomagnetic and oxygen isotopic analyses
M Okada; M Takagi; H Narita; K Takahashi, Lead
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2005, [Reviewed]

Characteristics of bottom surface sediments in relation to wind and wave action in Lake Kitaura, central Japan
T. Naya; K. Amano; M. Okada; R. Nakazato; F. Kumon; H. Nirei, 茨城県北浦湖底118地点で表層堆積物試料を採取し，粒度，全有機炭素量，全窒素量の分析を行い，風による波浪影響の強い浅い湖沼における堆積モデルを提唱した．担当部分：堆積物試料の採取，処理指導および堆積物組成に関する議論の一部．, The Geological Society of Japan
The Journal of Geological Society of Japan, 2004, [Reviewed]

Concentrations and fluxes of chloronaphthalenes in sediment from Lake Kitaura in Japan in past 15 centuries
Y Horii; J Falandysz; N Hanari; P Rostkowski; T Puzyn; M Okada; K Amano; T Naya; S Taniyasu; N Yamashita
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 2004, [Reviewed]

Diatom assemblage and productivity changes during the last 340,000 years in the subarctic Pacific
K Katsuki; K Takahashi; M Okada
JOURNAL OF OCEANOGRAPHY, Oct. 2003, [Reviewed]

Carbonate dissolution and planktonic foraminiferal assemblages observed in three piston cores collected above the lysocline in the western equatorial Pacific
K Kimoto; H Takaoka; M Oda; M Ikehara; H Matsuoka; M Okada; T Oba; A Taira
MARINE MICROPALEONTOLOGY, Mar. 2003, [Reviewed]

千倉層群下部の石灰質ナンノ化石群集に基づく本邦中部太平洋側海域の後期鮮新世表層海洋環境
亀尾浩司; 斎藤敬二; 小竹信宏; 岡田 誠, 房総半島南端部に分布する上部鮮新統千倉層群より産出する石灰質ナンノ化石群集を検討し，後期更新世の房総沖における海洋表層環境の変遷を考察した．担当部分：古地磁気層序による地層の詳細な年代決定に関する議論．, The Geological Society of Japan
地質学雑誌, 2003, [Reviewed]

Paleomagnetic overprints in ocean sediment cores and their relationship to shear deformation caused by piston coring
GD Acton; M Okada; BM Clement; SP Lund; T Williams
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Apr. 2002, [Reviewed]

茨城県北浦における柱状底質試料中の塩素化ナフタレン・ダイオキシン類異性体別分析　　　　　　　　　　　　　　　
Y. Horii; M. Okada; K. Amano; N. Hanari; S. Taniyasu; N. Yamashita, 堆積物に含まれる塩素化ナフタレン(PCNs)やダイオキシン状物質の分離および異性体別分析を高精度で行う手法を確立した．さらに茨城県北浦湖底堆積物試料を用い，PCNs汚染の歴史復元を行った．担当部分：テーマ設定，堆積物試料採取指導，年代決定の議論．
分析化学, 2002, [Reviewed]

タイ北部 Chian Muan に分布する第三系 Mae Moh 層群の古地磁気層序（予報）　　　　　　　　　　　　　　　
Y. Suganuma; M. Okada; N. Nagaoka, 東南アジア初の中新世大型類人猿化石が発見されたタイ北部に分布する Mae Moh層群の年代を古地磁気層序学的手法で調査し，11Ma前後であることを初めて明らかにした．担当部分：古地磁気分析およびデータ処理の指導，年代決定の議論．
霊長類研究, 2002, [Reviewed]

Records of the Cobb Mountain Subchron from the Bermuda Rise (ODP LEG 172)
Z Yang; BM Clement; GD Acton; SP Lund; M Okada; T Williams
EARTH AND PLANETARY SCIENCE LETTERS, Dec. 2001, [Reviewed]

Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan
T Kojima; M Okada; H Ohira; K Tokieda; H Komuro; K Amano, Corresponding
EARTH PLANETS AND SPACE, 2001, [Reviewed]

Brunhes chron magnetic field excursions recovered from Leg 172 sediments
S.P.Lund; T.Williams; G.D.Acton; B.Clement; M.Okada, 国際深海掘削計画第172節航海 (ODP Leg172) によって採取された西大西洋の海底堆積物コアの古地磁気記録から最後の地磁気逆転以降の期間である過去78万年間に数多くの地磁気エクスカーションが起こっていたことを明らかにした．担当部分：試料の古地磁気測定およびデータ解析に関する議論．
Proceedings of the Ocean Drilling Program, Scientific Results, 2001, [Reviewed]

Paleomagnetic records of Stage 3 excursions, Leg 172
S.P.Lund; G.D.Acton; B.Clement; M.Okada; T.Williams, 国際深海掘削計画第172節航海 (ODP Leg172) によって採取された堆積物コアに，酸素同位体ステージ３においてLaschamp Excursionに対応する地磁気エクスカーションが記録されていることを明らかにした．担当部分：試料の古地磁気測定およびデータ解析に関する議論．
Proceedings of the Ocean Drilling Program, Scientific Results, 2001, [Reviewed]

Sulfur isotope records around Livello Bonarelli (northern Apennines, Italy) black shale at the Cenomanian-Turonian boundary
N Ohkouchi; K Kawamura; Y Kajiwara; E Wada; M Okada; T Kanamatsu; A Taira
GEOLOGY, Jun. 1999, [Reviewed]

Further application of the deconvolution method of post-depositional DRM to the precise record of the Matuyama-Brunhes reversal in the sediments from the Bose Peninsula, Japan
H Tsunakawa; M Okada; N Niitsuma
EARTH PLANETS AND SPACE, 1999, [Reviewed]

Quaternary geomagnetic field intensity: Constant periodicity or variable period?
T Sato; H Kikuchi; M Nakashizuka; M Okada
GEOPHYSICAL RESEARCH LETTERS, Jun. 1998, [Reviewed]

Deconvolution of paleomagnetic directions from marine sediments in the Boso Peninsula, Japan, and its implications for the Matuyama-Brunhes transition field
H Tsunakawa; M Okada; N Niitsuma
JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1996, [Reviewed]

Detailed variation of geomagnetic field intensity during the late Pleistocene at Site 882　　　　　　　　　　　　　　　
Ocean Drilling Program
Proceedings of the Ocean Drilling Program, Scientific Results, Aug. 1995, [Reviewed]

WAS DEEP-WATER FORMED IN THE NORTH PACIFIC DURING THE LATE QUATERNARY - CADMIUM EVIDENCE FROM THE NORTHWEST PACIFIC
N OHKOUCHI; H KAWAHATA; M MURAYAMA; M OKADA; T NAKAMURA; A TAIRA
EARTH AND PLANETARY SCIENCE LETTERS, Jun. 1994

DETAILED PALEOMAGNETIC RECORDS DURING THE BRUNHES-MATUYAMA GEOMAGNETIC REVERSAL, AND A DIRECT DETERMINATION OF DEPTH LAG FOR MAGNETIZATION IN MARINE-SEDIMENTS
M OKADA; N NIITSUMA, Lead
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, Jul. 1989, [Reviewed]

Chibanian GSSP site and the stratigraphy of an on-land forearc basin Kazusa Group
Makoto OKADA; Yuki HANEDA
The Journal of the Geological Society of Japan, 06 Apr. 2023, [Reviewed], [Invited]
Lead

千葉複合セクションのn-アルカン分析による海洋酸素同位体ステージ19の陸上気候・植生変動復元
梶田 展人; 関 宰; 山本 正伸; 大河内 直彦; 岡田 誠; 羽田 裕貴; 菅沼 悠介
日本地球化学会第69回年会講演要旨集, Nov. 2022

チバニアンGSSPの特徴と、その学術上の意義　　　　　　　　　　　　　　　
岡田 誠
学術の動向, 01 Nov. 2022, [Invited]
Lead

Early Pleistocene Paleoceanography in the Northwestern Pacific Ocean based on the microfossil analyses of the upper part of the Kiwada Formation in the Kazusa Group
桑野太輔; 土屋祐貴; 亀尾浩司; 林広樹; 宇都宮正志; 久保田好美; 万徳佳菜子; 大浦佑馬; 岡田誠
日本地質学会学術大会(Web), 2022

Paleomagnetic dating of Taupo eruption, New Zealand
長谷川健; GREVE Annika; GRAVLEY Darren; 楠稚枝; 岡田誠; KOSIK Szabolcs; 望月伸竜; 金田泰明
日本火山学会講演予稿集, 2021

「チバニアン」と地質学
岡田 誠
環境管理 = Environmental management, Jun. 2019, [Invited]

未来技術の旗手たち 地層の古地磁気から読み解いた地質時代"チバニアン"
小川 明; 岡田 誠
商工ジャーナル, May 2019

Refined chronology for geomagnetic reversal boundaries
菅沼 悠介; 岡田 誠; 堀江 憲路
号外地球, 2014

広域テフラに対比される溶結凝灰岩による絶対古地磁気強度測定:相対古地磁気強度との対比と絶対値較正
藤井哲夢; 望月伸竜; 長谷川健; 岡田誠; 渋谷秀敏
地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2013

地球磁場極性逆転年代の高精度化　　　　　　　　　　　　　　　
菅沼悠介; 岡田誠; 堀江憲路
月刊地球号外, 2013

Geomagnetic field excursions occurred often during the last million years(jointly worked)
LUND S. O.
EOS, transactions, AGU, Aug. 1998

Paleomagnetic and tephrochronological analyses of a sediment core from Lake Kitaura(jointly worked)　　　　　　　　　　　　　　　
Okada M.; Amano; K.; Kikuchi; Y.; Itoda; C
Publication of Itako Hydrobiological Station, Oct. 1997
Lead

BENTHIC FORAMINIFERA CADMIUM RECORD FROM THE WESTERN EQUATORIAL PACIFIC
N OHKOUCHI; H KAWAHATA; M OKADA; M MURAYAMA; E MATSUMOTO; T NAKAMURA; A TAIRA
MARINE GEOLOGY, Sep. 1995

北太平洋における新生代の古海洋学的変遷 ーODP Leg145の成果ー　　　　　　　　　　　　　　　
岡田 誠; ODP Leg; 乗船研究者一同
月刊海洋,海洋出版, Aug. 1993
Lead

最新 地学事典　　　　　　　　　　　　　　　
地学団体研究会 編, Contributor
平凡社, 21 Mar. 2024
9784582115086

古生物学の百科事典　　　　　　　　　　　　　　　
日本古生物学会 編; 西 弘嗣 編集委員長, Contributor
丸善出版, 01 Feb. 2023
9784621307588

チバニアン誕生 : 方位磁針のN極が南をさす時代へ
岡田, 誠, Single work
ポプラ社, Jun. 2021
9784591170342

地球・惑星・生命 = The earth, planets, and life
日本地球惑星科学連合, Contributor
東京大学出版会, May 2020
9784130637152

海洋底科学の基礎　　　　　　　　　　　　　　　
日本地質学会「海洋底科学の基礎」編集委員会編, Joint work
共立出版, 15 Sep. 2016
9784320047297

Field Geology 2, Stratigraphy and Chronology　　　　　　　　　　　　　　　
Hasegawa, S; Nakajima, T; Okada, M, Joint work
Kyoritsu Shuppan, 25 Jan. 2006
432004682X

Professional English-Japanese Dictionary, SPED TERRA　　　　　　　　　　　　　　　
Horiuchi; K.; Kanie; Y.; et al.; edt., Contributor
Shogakukan, 20 Jul. 2004
409506711X

房総半島南端地域に分布する海成層の第四系基底部付近におけるボーリングコアを用いた超高時間解像度を持つ古地磁気-酸素同位体複合層序構築の試み　　　　　　　　　　　　　　　
柚原 涼花; 岡田 誠; 長友 大輝; 菅沼 悠介
日本地質学会第131年学術大会, 09 Sep. 2024
20240908, 20240910

房総半島南端に分布する千倉層群から得られた中期鮮新世温暖期末期の古地磁気-酸素同位体複合層序　　　　　　　　　　　　　　　
谷元 瞭太; 岡田 誠
日本地質学会第131年学術大会, 09 Sep. 2024
20240908, 20240910

複数の地層群から復元した同一地磁気逆転周辺の古地磁気変動記録の比較　　　　　　　　　　　　　　　
小西 拓海; 岡田 誠; 小塚 大輝
日本地質学会第131年学術大会, 09 Sep. 2024
20240908, 20240910

房総半島南端に分布する海成更新統の2.17Ma付近の層準で検出された地磁気エクスカーション記録　　　　　　　　　　　　　　　
岡田 誠; 前田 郷; 小塚 大輝; 小西 拓海
日本地質学会第131年学術大会, 09 Sep. 2024
20240908, 20240910

Lithofacies and rock-magnetic properties of borehole cores drilled on the submarine caldera wall of the Kikai Caldera　　　　　　　　　　　　　　　
西来 邦章; 佐藤 勇輝; 羽生 毅; 宮崎 隆; Tejada Maria Luisa; 上木 賢太; 臼井 洋一; 金子 克哉; 清杉 孝司; 鈴木 桂子; 中岡 礼奈; 長谷川 健; 岡田 誠
JpGU 2024, 31 May 2024
20240524, 20240531

Piacenzian oxygen isotope-magnetostratigraphy constrained by U-Pb;dating of tephra beds from a marine;sucession in central Japan　　　　　　　　　　　　　　　
羽田 裕貴; 岩野 英樹; 檀原 徹; 平田 岳史; 細井 淳; 久保田 好美; 中谷 是崇; 岡田 誠
JpGU 2024, 29 May 2024
20240524, 20240531

A magneto-oxygen isotopic stratigraphy using an oriented boring core drilled through the Quaternary base horizon in the southernmost Boso Peninsula, Japan　　　　　　　　　　　　　　　
柚原 涼花; 岡田 誠; 長友 大輝; 菅沼 悠介
JpGU 2024, 28 May 2024
20240524, 20240531

A geomagnetic excursion detected at the lower Matuyama reversed polarity chronozone in a marine Pleistocene sequence distributed in the southernmost Boso Peninsula　　　　　　　　　　　　　　　
岡田 誠; 前田 郷; 小塚 大輝; 小西 拓海
JpGU 2024, 28 May 2024
20240524, 20240531

Investigation of the carriers of secondary magnetization using micro-magnetic analysis with SQUID microscopy　　　　　　　　　　　　　　　
谷元 瞭太; 小田 啓邦; 岡田 誠
JpGU 2024, 27 May 2024
20240524, 20240531

Rotated Transtensional Basins Formed During Back-arc Spreading in Japan: Simultaneous Rapid Tectonic Rotation and Basin Subsidence　　　　　　　　　　　　　　　
Jun Hosoi; Yurie Tanii; Makoto Okada; Yuki Haneda
AGU23 (American Geophysical Union, 2023 fall meeting), 12 Dec. 2023
20231209, 20231213

Continuous Relative paleointensity records for the C2An.3n-C2An.2n period from the marine succession in the southernmost part of the Boso Peninsula, central Japan　　　　　　　　　　　　　　　
Akihiro Tanimoto; Makoto Okada
AGU23 (American Geophysical Union, 2023 fall meeting), 12 Dec. 2023
20231209, 20231213

房総半島南端地域に分布する海成上部鮮新統千倉層群布良層における層序学的研究　　　　　　　　　　　　　　　
谷元 瞭太,岡田 誠,柴田 翔平
日本地質学会第130年京都大会, 19 Sep. 2023, 日本地質学会
20230917, 20230919

南房総海成鮮新−更新統の第四系基底部における定方位ボーリングコアを用いた超高時間解像度を持つ古地磁気−酸素同位体複合層序構築の試み　　　　　　　　　　　　　　　
岡田 誠,柚原 涼花,長友 大輝,菅沼 悠介
日本地質学会第130年京都大会, 19 Sep. 2023, 日本地質学会
20230917, 20230919

古地磁気層序とテフラ層序に基づく房総半島南端の下部更新統千倉層群と同半島東部の上総層群の対比　　　　　　　　　　　　　　　
小西 拓海,岡田 誠,宇都宮 正志,田村 糸子,小塚 大輝
日本地質学会第130年京都大会, 19 Sep. 2023, 日本地質学会
20230917, 20230919

房総半島南端に分布する海成更新統の約1.9-2.2Maの年代区間における詳細な古地磁気－酸素同位体複合層序　　　　　　　　　　　　　　　
小塚 大輝,岡田 誠,小西 拓海,江部 裕太
日本地質学会第130年京都大会, 19 Sep. 2023, 日本地質学会
20230917, 20230919

Paleomagnetic and oxygen isotopic analyses on a boring core drilled through the base of Quaternary from the marine sedimentary succession Chikura Group in the southern Boso Peninsula, Japan　　　　　　　　　　　　　　　
Makoto Okada; Joan Songeons; Daiki Nagatomo; Yusuke Suganuma
XXI INQUA congress in Roma, 18 Jul. 2023, International Union for Quaternary Research
20230714, 20230720

Paleomagnetic and 10Be records across the Pleistocene and Pliocene geomagnetic polarity transitions from the Boso Peninsula, central Japan　　　　　　　　　　　　　　　
Yuki Haneda; Yusuke Suganuma; Hiroto Kajita; Masayuki Utsunomiya; Makoto Okada
XXI INQUA congress in Roma, 17 Jul. 2023, International Union for Quaternary Research
20230714, 20230720

Coupled terrestrial and oceanic variability during marine isotope stage 19 reconstructed from biomarkers in the Chiba Composition Section　　　　　　　　　　　　　　　
Hiroto Kajita; Osamu Seki; Masanobu Yamamoto; Makoto Okada; Yuki Haneda; Naohiko Ohkouchi; Yusuke Suganuma
XXI INQUA congress in Roma, 15 Jul. 2023, International Union for Quaternary Research
20230714, 20230720

南房総に分布する海成更新統を用いた地磁気逆転イベントと海洋同位体層序との精密対比　　　　　　　　　　　　　　　
岡田 誠,小塚 大輝,小西 拓海,江部 裕太
Japan Geoscience Union Meeting 2023, 26 May 2023, Japan Geoscience Union
20230521, 20230526

北西太平洋における後期鮮新世の酸素同位体ー古地磁気複合層序と古気候復元　　　　　　　　　　　　　　　
羽田 裕貴,岡田 誠,久保田 好美,本郷 美佐緒,中谷 是崇
Japan Geoscience Union Meeting 2023, 26 May 2023, Japan Geoscience Union
20230521, 20230526

海成鮮新-更新統千倉層群における第四紀開始境界付近の年代層序　　　　　　　　　　　　　　　
長友 大輝,岡田 誠,Sngeons Joan
Japan Geoscience Union Meeting 2023, 26 May 2023, Japan Geoscience Union
20230521, 20230526

房総半島南端に分布する千倉層群布良層から得られたMammoth逆磁極亜帯周辺の古地磁気記録　　　　　　　　　　　　　　　
谷元 瞭太,岡田 誠
Japan Geoscience Union Meeting 2023, 26 May 2023, Japan Geoscience Union
20230521, 20230526

北海道東部，阿寒カルデラ噴出物ボーリングコア中に認められたMatuyama-Brunhes逆転境界　　　　　　　　　　　　　　　
長谷川 健,楠 稚枝,岡田 誠,平塚 葵,西来 邦章,佐藤 勇輝
Japan Geoscience Union Meeting 2023, 26 May 2023, Japan Geoscience Union
20230521, 20230526

房総半島に分布する鮮新－更新統の堆積岩に記録された残留磁化の構成成分のSQUID顕微鏡を用いた予察的分析　　　　　　　　　　　　　　　
谷元 瞭太,小田 啓邦,岡田 誠,福與 直人
Japan Geoscience Union Meeting 2023, 24 May 2023, Japan Geoscience Union
20230521, 20230526

チバニアンGSSPの批准とその年代層序学的意義　　　　　　　　　　　　　　　
岡田 誠
日本地質学会第129年学術大会, 05 Sep. 2022, 一般社団法人日本地質学会, [Invited]
20220904, 20220906

第四紀更新世における地質年代境界決定の現状　　　　　　　　　　　　　　　
岡田 誠
日本地質学会第129年学術大会, 05 Sep. 2022, 一般社団法人日本地質学会, [Invited]
20220904, 20220906

房総半島の海成鮮新ー更新統における古地磁気ー同位体複合層序の構築とその意義
岡田 誠
日本第四紀学会 2021年日本第四紀学会学会賞・学術賞受賞記念 第2回講演会, 04 Jun. 2022, 日本第四紀学会, [Invited]
20220604, 20220604

A preliminary paleomagnetic study using an oriented-boring core on the base of Quaternary of the Plio-Pleistocene marine sedimentary succession in the southern Boso Peninsula, Japan
Makoto Okada; Joan Songeons
Japan Geoscience Union Meeting 2022, 22 May 2022, Japan Geoscience Union
20220522, 20220602

Characteristics of Chibanian GSSP and its scientific significance
Makoto Okada
日本学術会議公開シンポジウム「チバニアン、学術的意義とその社会的重要性」, 24 May 2022, Japan Science Council, [Invited]
20220524, 20220524

GSSP, Chibanian ,and Geology of Boso Peninsula　　　　　　　　　　　　　　　
Makoto Okada
Development of Joint Research between Mongolia and Japan on Geological Information, Natural Resources, and Analytical Technologies of Geological Samples, 02 Mar. 2022, 産業技術総合研究所・さくらサイエンスプログラム, [Invited]
20220301, 20220302

房総の地質と松山-ブリュン境界,～チバニアン前夜～
岡田 誠・菅沼悠介
2021年度 田中舘賞受賞講演, 03 Nov. 2021, 地球電磁気・地球惑星圏学会, [Invited]
20211102, 20211104

チバニアン認定と，その古生物学・古環境学への貢献
岡田 誠
日本古生物学会第170回例会 シンポジウム１「南関東の前弧海盆堆積物に記録された古環境変遷ー年代層序と化石記録からー, 05 Feb. 2021, 日本古生物学会, [Invited]
20210205, 20210207

チバニアンと古環境学 −陸上地質のススメ−
岡田 誠
地球環境史学会2020年大会, 07 Nov. 2020, 地球環境史学会, [Invited]
20201107, 20201107

第四紀 “千葉時代”（チバニアン）の決定とその意義　　　　　　　　　　　　　　　
岡田 誠
日本第四紀学会普及講演, 29 Aug. 2020, 日本第四紀学会, [Invited]
20200829, 20200829

Geomagnetic reversals occurred during the last 4.5 million years recorded on the Plio-Pleistocene marine successions distributed in the Boso Peninsula and its surrounding region, central Japan
Makoto Okada
JpGU-AGU Joint Meeting 2020, 13 Jul. 2020, JpGU（日本地球惑星科学連合）, [Invited]
20200712, 20200715

日本最初の地質時代名称チバニアンと最後の地磁気逆転
岡田 誠
JpGUトップセミナー, 12 Jul. 2020, JpGU（日本地球惑星科学連合）, [Invited]
20200712, 20200712

Millennial scale paleoceanographic variation during MIS 19 based on foraminiferal isotope records from the Chiba composite section
Haneda Yuki; Okada Makoto; Kubota Yoshimi; Suganuma Yusuke
Annual Meeting of the Geological Society of Japan, 2019, The Geological Society of Japan
2019, 2019

千葉セクションにおける地磁気逆転記録　　　　　　　　　　　　　　　
岡田 誠
産業技術総合研究所 海外卓越研究院招聘事業成果発表会「地球惑星科学における磁場逆転と磁性物質」, 14 Mar. 2019, 産業技術総合研究所, [Invited]
20180314

A multi-millennial scale paleoceanographic variation during MIS 19 based on foraminiferal isotope records from the Chiba composite section
Haneda Yuki; Okada Makoto; Kubota Yoshimi; Suganuma Yusuke
Annual Meeting of the Geological Society of Japan, 2018, The Geological Society of Japan
2018, 2018

Comparison of paleomagnetic variation between the upper Chikura Group and the lower Kazusa Group distributed on the Boso Peninsula
takumi konishi; Makoto Okada; Toru Maruoka; Masayuki Utsunomiya
Annual Meeting of the Geological Society of Japan, 2017, The Geological Society of Japan
2017, 2017

Detailed paleomagnetic and oxygen isotopic records during the M-B polarity transition from the Chiba section, Boso Peninsula, Japan
Okada Makoto; Haneda Yuki; Suganuma Yusuke; Kazaoka Osamu
Annual Meeting of the Geological Society of Japan, 2015, The Geological Society of Japan
2015, 2015

Neogene and Quaternary calcareou nannofossil datums recognized in and around the Pacific side of Japanese islands
Kameo Koji; Okada Yoshiaki; Chiyonobu Shun; Okada Makoto
Annual Meeting of the Geological Society of Japan, 2015, The Geological Society of Japan
2015, 2015

An integrated chronostratigraphy in the Anno Formation, Awa Group, middle part of the Boso Peninsula, central Japan, based on data from paleomagnetic and oxygen isotopic analyses
Haneda Yuki; Okada Makoto
Annual Meeting of the Geological Society of Japan, 2015, The Geological Society of Japan
2015, 2015

過去500万年間のベーリング海気候変動―海氷出現と寒冷化―IODP Expedition323掘削成果
高橋孝三; 岩崎晋弥; 兼松芳幸; 小野寺丈尚太郎; 岡崎裕典; 須藤斎; 朝日博史; 池上隆仁; 坂本竜彦; 池原実; 関宰; 堀川恵司; 岡田誠; 井尻暁; RAVELO A.C; ZARIKIAN ALVAREZ C
日本海洋学会大会講演要旨集, 01 Sep. 2012
20120901, 20120901

The early to middle Miocene tectonics of Ou backbone ranges in Nishiwaga town, Iwate prefecture, northeast Japan
Hosoi Jun; Okada Makoto; Amano Kazuo
Annual Meeting of the Geological Society of Japan, 2012, The Geological Society of Japan
2012, 2012

Planktonic foraminiferal biostratigraphy of the Plio-Pleistcene Chikura Group, southernmost part of the Boso Peninsula, central Japan and inferred sea surface environmental changes
Hamada Sanae; Kameo koji; Hayashi Hiroki; Okada Makoto
Annual Meeting of the Geological Society of Japan, 2012, The Geological Society of Japan
2012, 2012

Neogene-Quaternary boundary of the Miura-Kazusa Groups in Miura peninsula
Utsunomiya Masayuki; Kusu Chie; Nakamura Ayako; Majima Ryuichi; Tanaka Yuichiro; Okada Makoto
Annual Meeting of the Geological Society of Japan, 2012, The Geological Society of Japan
2012, 2012

O-1 Chronostaratigraphy of the Choshi Core
OKADA Makoto; Kameo Koji; Nakazato Hiroomi; Ohkouchi Naohiko; Hisamitsu Toshio; Kitazato H
Annual Meeting of the Geological Society of Japan, 2004, The Geological Society of Japan
2004, 2004

O-144 Reconstruction of Late Pleistocene Marine Environmental Changes Based on Chemical Analyses of an On-Land Sediment Core From the Choshi Area, Central Japan
Okada Makoto; Maruta Kana
Annual Meeting of the Geological Society of Japan, 2002, The Geological Society of Japan
2002, 2002

P-114 Miocene Tectonics of the Northeast Japan Based on Paleomagnetism
KOJIMA Takeshi; OKADA Makoto; AMANO Kazuo
Annual Meeting of the Geological Society of Japan, 2000, The Geological Society of Japan
2000, 2000

Reconstruction of the eastern part of the Misaka mountains based on the accretional tectonics of island arcs in the South Fossa Magna, central Japan
TANAKADATE Hirokitsu; AMANO Kazuo; OKADA Makoto
Annual Meeting of the Geological Society of Japan, 1999, The Geological Society of Japan
1999, 1999

Rotation of a segment of the Honshu arc caused by collisions in the South Fossa Magna, central Japan
Amano Kazuo; Ishida Takashi; Martin Andrew James; Tanakadate Hirokitsu; Naya Tomonori; Suzuki Kumiko; Suganuma Yusuke; Okada Makoto
Annual Meeting of the Geological Society of Japan, 1998, The Geological Society of Japan
1998, 1998

Movemensts Oki-Dogo Island during the Japan Sea opening from paleomagnetic studies
KOJIMA Takeshi; OKADA Makoto; TOKIEDA Katsuyasu; KOMURO Hiroaki; AMANO Kazuo
Annual Meeting of the Geological Society of Japan, 1998, The Geological Society of Japan
1998, 1998

13 Magnetostratigraphy of the Plio-Pleistocene Chikura Group, southernmost prat of the Boso Peninsula, central Japan
SAITO K.; OKADA M.; KAMEO K.; KOTAKE N.
Annual Meeting of the Geological Society of Japan, 1997, The Geological Society of Japan
1997, 1997

555 Magnetostratigraphy of Hata Formation, Chikura Group distributing on the southern Boso Peninsula
SAITOH Keiji; OKADA Makoto; KOTAKE Nobuhiro; KAMEO Koji
Annual Meeting of the Geological Society of Japan, 1996, The Geological Society of Japan
1996, 1996

554 Correlation between the Umegase Formationof the Kazusa Group and the Kanamari Formation of the Chikura Grupe based on geomagnetic excursions
KORIYA Yorihide; OKADA Makoto; KAMEO Koji; TAKAYAMA Toshiaki; AMANO Kazuo
Annual Meeting of the Geological Society of Japan, 1996, The Geological Society of Japan
1996, 1996

571 Relation between turbidite facies and sea level change : An example from the Kazusa Group
Tsuji Takashi; Satoh Yuri; Mita Isao; Uchida Ei-ici; Okada Makoto; Miyata Yuichiro; Nakamizu Masaru
Annual Meeting of the Geological Society of Japan, 1996, The Geological Society of Japan
1996, 1996

45. Maguneto-biostratigraphy of marine sediments around the Plio-Pleistocene boundary distributing on the southern most part of the Boso Peninsula
Saitoh Keiji; Okada Makoto; Kameo Kouji
Annual Meeting of the Geological Society of Japan, 1995, The Geological Society of Japan
1995, 1995

May 2010 - Present, Paleosciences Society

Apr. 2000 - Present, 日本第四紀学会

Apr. 1991 - Present, アメリカ地球物理学会(American Geophysical Union)

Aug. 1989 - Present, The Geological Society of Japan

Oct. 1986 - Present, 地球電磁気・地球惑星圏学会

地磁気逆転現象が気候・生態系に対して与えた影響の検証
基盤研究(S)
茨城大学
Apr. 2024 - Mar. 2029

Reconstruction of geomagnetic field and its influence on history of the Earth and life using magnetic microscopy around the formation of inner core
Grant-in-Aid for Scientific Research (A)
National Institute of Advanced Industrial Science and Technology
Apr. 2021 - Mar. 2025

水蒸気噴火の推移予測法の開発：物質科学的特徴から探る熱水ーマグマ系プロセス
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Ibaraki University
Apr. 2021 - Mar. 2024

〔Major achievements〕Age determination of the geomagnetic reversals for the last 4 million years ago, and evaluation for its effect on biota and climate
Grant-in-Aid for Scientific Research (A)
Ibaraki University
Apr. 2019 - Mar. 2023

Estimation of location, magnitude, and mode of the impact of a small solar system body in Southeast Asia at ca. 0.8 Ma and its effect on the surrounding environment
Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
Oct. 2018 - Mar. 2022

火山灰層の古地磁気方位を利用した巨大噴火同時発生イベントの検証
Grant-in-Aid for Scientific Research (C)
Apr. 2016 - Mar. 2020

High-resolution reconstruction of the paleoenvironmental changes recorded in the Kokumoto Formation, Kazusa Group, based on multiproxy analysis
Grant-in-Aid for Research Activity Start-up
Chiba University
Aug. 2017 - Mar. 2019

〔Major achievements〕Age determination for the Matuyama-Brunhes geomagnetic reversal boundary and comprehensive calibration of geologic ages
Grant-in-Aid for Scientific Research (B)
Ibaraki University
Apr. 2016 - Mar. 2019

Establishment of calcareous nannofossi biohorizons around the Northwestern Pacific based on the examination of the upper Cenozoic in Japan
Grant-in-Aid for Scientific Research (C)
Chiba University
Apr. 2014 - Mar. 2017

急激な温暖化における太平洋高緯度海洋の役割～過去１１回の温暖化アーカイブの構築
Grant-in-Aid for Scientific Research(A)
Apr. 2011 - Mar. 2014

地磁気逆転期における寒冷化イベントの発生 原因の解明
Grant-in-Aid for Scientific Research(B)
Kobe University
Apr. 2010 - Mar. 2013

フィリピンから産出する化学合成化石群集の成立条件の解明
Grant-in-Aid for Scientific Research(B)
Yokohama National University
Apr. 2011 - Mar. 2012

Paleoenvironments reconstructed from formation processes of recent and fossil oyster reefs, and the paleoecological evolution of oysters
Grant-in-Aid for Scientific Research (B)
Ibaraki University
2010 - 2012

〔Major achievements〕房総半島に分布する海成堆積層を用いた，鮮新統〜更新統における高精度基準層序の確立
Grant-in-Aid for Scientific Research(C)
Ibaraki University
Apr. 2008 - Mar. 2011

光ルミネッセンス年代決定法を用いた極域寒冷圏の高分解能古海洋変動解析
Grant-in-Aid for Scientific Research(A)
Japan Agency for Marine-Earth Science and Technology
Apr. 2008 - Mar. 2011

Cretaceous-Paleogene paleoenvironmental changes in the Yezo basin, Northeast Japan.
Grant-in-Aid for Scientific Research (C)
Ibaraki University
2005 - 2007

〔Major achievements〕地層褶曲等による堆積物変形が残留磁化方位に及ぼす影響の評価
Grant-in-Aid for Exploratory Research
茨城大学
Apr. 2003 - Mar. 2006

〔Major achievements〕Reconstraction of the Neogen techtonic evolution at the Boso and Miura peninsulas based on paleomagnetic studies
Others
茨城大学
Apr. 2000 - Mar. 2002

Sequence stratigraphy and biofacies of the Cretaceous and Tertiary (K/T) boundary and its nearby horizons in Hokkaido, northern Japan
Grant-in-Aid for Scientific Research (C)
IBARAKI UNIVERSITY
1998 - 2001

Environmental changes from greenhouse earth to icehouse earth through a study of chalk/black shale sequence
Grant-in-Aid for Scientific Research (A).
The University of Tokyo
1998 - 2000

Study of Ocean Floor Structure and Evolution by Drilling
Grant-in-Aid for international Scientific Research
Ocean Research Institute, Univ.of Tokyo
1994 - 1996

Study of World Ocean Floor by Drilling & Down hole Measurement
Grant-in-Aid for international Scientific Research
Ocean Research Institute, Univ. of Tokyo
1992 - 1993

地質年代チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
一般社団法人 建設コンサルタンツ協会, 令和４年度地質技術勉強会, 23 Jul. 2022 - 23 Jul. 2022

チバニアンズガイド講座 房総の地質の特徴とチバニアン　　　　　　　　　　　　　　
lecturer
NPO法人チバニアンズ, チバニアンズガイド講座, 10 Jul. 2022 - 10 Jul. 2022

千葉県立中央博 特別講演会「親子で学ぶチバニアン 〜地層の声をきこう！〜」
lecturer
千葉県立中央博物館, 03 Jul. 2022

千葉の自然シリーズ 地層の声を聴け！〜チバニアンから探る地球の歴史〜
lecturer
千葉市科学館, 大人が楽しむ科学教室2022, 03 Jul. 2022

チバニアンと房総半島
lecturer
mihorin企画, 安房の魅力とさかなクン〜東京湾と館山〜, 26 Jun. 2022

2022年度いきいき大学教養文化教室,チバニアン 〜千葉の名前が地球の歴史に〜　　　　　　　　　　　　　　
lecturer
いきいき大学, 2022年度いきいき大学教養文化教室, 25 Apr. 2022

蛍雪時代2022年4月増刊号 全国大学学部・学科案内号 理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2021年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2022

NPOチバニアンズガイド講習会 ラボ見学会
lecturer
NPO法人チバニアンズ, ガイド講習会, 16 Dec. 2021 - 16 Dec. 2021

石から見える世界,〜鉄道でいこう！１００万年前の深海への旅〜
lecturer
ちば子ども大学, 2021年度 ちば子ども大学講座, 14 Dec. 2021 - 14 Dec. 2021

茨城大学図書館土曜アカデミー 新著を語る「チバニアン誕生」　　　　　　　　　　　　　　
lecturer
茨城大学図書館, 土曜アカデミー 新著を語る, 06 Nov. 2021

地質時代チバニアンと房総の地質　　　　　　　　　　　　　　
lecturer
市原市加茂公民館, 講演会, 16 Oct. 2021

チバニアンとは? ~千葉時代と地磁気の逆転~　　　　　　　　　　　　　　
lecturer
土木学会関東支部, 土木学会関東支部談話会, 05 Oct. 2021

チバニアン 〜千葉の名前が地球の歴史に〜　　　　　　　　　　　　　　
lecturer
いきいき大学, 2021年度いきいき大学教養文化講座, 17 Aug. 2021

チバニアン見学会　　　　　　　　　　　　　　
lecturer
mihorin企画, 11 Jul. 2021

チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
かわさき市民アカデミー, 講座４「広がる生命科学の世界」, 26 Apr. 2021

小湊鉄道と房総の地質　　　　　　　　　　　　　　
lecturer
いきいき大学, 2021年度いきいき大学教養文化教室, 26 Apr. 2021

日本初の地質時代名称「チバニアン」誕生とその意義　　　　　　　　　　　　　　
lecturer
一般社団法人日本外科学会, 第121回定期学術集会 特別講演, 10 Apr. 2021

蛍雪時代2021年4月増刊号 全国大学学部・学科案内号 理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2021年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2021

第四紀“千葉時代”（チバニアン）の決定とその意義　　　　　　　　　　　　　　
lecturer
日本第四紀学会, 普及講演, 27 Dec. 2020

チバニアンズ ガイド講座　　　　　　　　　　　　　　
lecturer
NPO法人 チバニアンズ, 17 Dec. 2020

チバニアンと地層のでき方　　　　　　　　　　　　　　
lecturer
NPO法人ひと・まちねっとわーく, いばらき子ども大学デリバリー事業, 14 Dec. 2020

チバニアン見学会　　　　　　　　　　　　　　
lecturer
一般社団法人 学士会, 08 Nov. 2020

地質時代「チバニアン」　　　　　　　　　　　　　　
lecturer
市原市加茂公民館, 講演会, 17 Oct. 2020

地層学から見た地球温暖化と気候変動「チバニアンの発見と研究から見えてきた新たな気候学」　　　　　　　　　　　　　　
lecturer
一般社団法人 茨城県環境管理協会, 第3回エコ・カレッジ職域コース, 25 Sep. 2020

「チバニアン」から読み解く地球の謎　　　　　　　　　　　　　　
lecturer
毎日新聞千葉支局, 企業人大学9月講座, 16 Sep. 2020

チバニアンの全て〜最後の地磁気逆転はどのように起こったのか　　　　　　　　　　　　　　
lecturer
一般社団法人 学士会, 夕食会講演, 07 Sep. 2020

新地質年代・チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
鉄道・運輸機構東京支社, 第16回業務研究発表会 特別講演, 25 Aug. 2020

日本最初の地質時代名称チバニアンと最後の地磁気逆転　　　　　　　　　　　　　　
lecturer
公益社団法人 日本地球惑星科学連合, トップセミナー, 12 Jul. 2020

蛍雪時代2020年4月増刊号 全国大学学部・学科案内号 理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2020年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2020

理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2020年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2020

「チバニアン」と地質時代　　　　　　　　　　　　　　
lecturer
深田地質研究所, 第196回深田研談話会, 13 Dec. 2019

地質時代「チバニアン」ー地質学で探る地球の歴史ー　　　　　　　　　　　　　　
lecturer
城里町教育委員会, 東茨城郡教育振興大会, 12 Nov. 2019

チバニアンと地質時代　　　　　　　　　　　　　　
lecturer
千葉県生涯大学校, 千葉県生涯大学校京葉学園講座, 31 Oct. 2019

チバニアンと地質時代　　　　　　　　　　　　　　
lecturer
茨城大学, 茨城大学創立70周年記念講演会, 26 Oct. 2019

チバニアンについて学ぶ　　　　　　　　　　　　　　
lecturer
東海大浦安高等学校, サイエンスクラス講座, 18 Oct. 2019

チバニアンからひもとく地球の歴史　　　　　　　　　　　　　　
lecturer
茨城高等学校, 1 day キャンパス in 茨城高校, 22 Sep. 2019

千葉セクションから読み解く地球史　　　　　　　　　　　　　　
lecturer
市原市田淵町会, 田淵ガイド養成講座, 22 Aug. 2019

「チバニアン」から学ぶ地質学 GSSPと地質時代　　　　　　　　　　　　　　
lecturer
2019年 茨城大学高校生公開講座, 08 Aug. 2019

「チバニアン」と地質学　　　　　　　　　　　　　　
lecturer
いきいき大学, いきいき大学教養文化教室, 13 May 2019

地磁気の逆転とチバニアン　　　　　　　　　　　　　　
lecturer
兵庫県立大学大学院地域資源マネジメント研究科, サイエンスカフェRRM, 12 May 2019

蛍雪時代2019年4月増刊号 全国大学学部・学科案内号 理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2019年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2019

理学部系統 地学分野　　　　　　　　　　　　　　
contribution
蛍雪時代2019年4月増刊号 全国大学学部・学科案内号, 30 Mar. 2019

「チバニアン」と地磁気逆転　　　　　　　　　　　　　　
lecturer
放送大学茨城学習センター, 放送大学ライブラリー講演会, 15 Dec. 2018

チバニアンと地質学　　　　　　　　　　　　　　
lecturer
東京私立中学高等学校協会, 理数系教科研究会（理科・地学）講演会, 07 Dec. 2018

チバニアン現地巡検　　　　　　　　　　　　　　
lecturer
茨城県高等学校教育研究会, 平成30年度茨城県高等学校教育研究会地学部地区合同研修会, 28 Nov. 2018

房総地質巡検　　　　　　　　　　　　　　
lecturer
(株)建築技術研究所, 平成30年度CTIグループ地質部門 地質巡検, 30 Aug. 2018 - 31 Aug. 2018

チバニアン　　　　　　　　　　　　　　
appearance
NHK ETV放送, サイエンスZERO特別編 ５７５でカガク！, 26 Aug. 2018

「チバニアン」と地学・地質学教育　　　　　　　　　　　　　　
lecturer
京都大学防災研究所, 京大防災研研究集会「地学教育の展望ー来たるべき南海トラフ地震に備えてー」, 25 Aug. 2018

「チバニアン」と地質時代　　　　　　　　　　　　　　
lecturer
全国私立幼稚園連合会, 関東大会記念講演会, 21 Aug. 2018

チバニアンと地質学　　　　　　　　　　　　　　
lecturer
地学団体研究会, 2018年度総会記念講演会, 19 Aug. 2018

「チバニアン」と地質時代　　　　　　　　　　　　　　
lecturer
一般社団法人総合科学研究機構, CROSS2018総合科学市民公開講座 太陽系と地球誕生の謎に迫る, 18 Aug. 2018

「チバニアン」から探る地球の歴史　　　　　　　　　　　　　　
lecturer
茨城新聞社, 茨城新聞政経懇話会講演会, 26 Jul. 2018

“チバニアン”って何だろう？　　　　　　　　　　　　　　
lecturer
千葉県立佐倉高等学校, 佐倉高校SSH講演会, 17 Jul. 2018

「チバニアン」から探る地球の歴史　　　　　　　　　　　　　　
lecturer
ひたちなか市, 平成30年度ひたちなか市民大学 基調講演, 22 Jun. 2018

地質学で地球の歴史を探る　　　　　　　　　　　　　　
lecturer
所沢市民大学, 第26期所沢市民大学講座, 11 Jun. 2018

チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
慶應学術事業会, 慶應MCC夕学50講, 17 May 2018

チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
水戸ロータリークラブ, 水戸ロータリークラブ卓話, 30 Apr. 2018

「チバニアン」と地質学　　　　　　　　　　　　　　
lecturer
明治大学博物館友の会, 友の会講演会, 26 Apr. 2018

チバニアン現地見学会　　　　　　　　　　　　　　
lecturer
よみうりカルチャー船橋ららぽーと, 地層のふしぎ「チバニアン」を知ろう 公開講座, 31 Mar. 2018

チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
里山会（千葉市）, 里山トークリレー, 30 Mar. 2018

地質時代とはなにか？ 地磁気逆転ってなんだろう？　　　　　　　　　　　　　　
lecturer
よみうりカルチャー船橋ららぽーと, 地層のふしぎ「チバニアン」を知ろう 定期講座, 30 Mar. 2018

GSSP申請と千葉セクション　　　　　　　　　　　　　　
lecturer
千葉県立中央博物館, 中央博記念事業 「誕生なるか！チバニアン」講演会, 18 Mar. 2018

知りたい！チバニアン 地層が語る地球の歴史　　　　　　　　　　　　　　
lecturer
毎日新聞社, 毎日新聞メディアカフェ, 22 Jan. 2018

地球最後の地磁気逆転を記録した「千葉セクション」の研究とその意義　　　　　　　　　　　　　　
lecturer
日本技術士会応用理学部会, 日本技術士会応用理学部会講演会, 16 Dec. 2017

チバニアンと地磁気逆転　　　　　　　　　　　　　　
lecturer
放射線医学総合研究所, 放射線医学総合研究所創立60周年記念講演会, 27 Nov. 2017

最後の地磁気逆転が記録された“千葉セクション”の国際標準模式層への認定(チバニアン)と想定される地学教育への貢献　　　　　　　　　　　　　　
lecturer
東京大学地震研究所, 東大地震研共同研究集会「地震・火山現象を含む学校地学教育の現状とそのイノベーション」, 11 Nov. 2017