Presentations -
about 71-
Search for meteorite impact origin spherules in the Barberton greenstone belt
Hibiya Yuki, Yoshiya Kazumi, Iizuka Tsuyoshi, Yamamoto Shinji, Komiya Tsuyoshi, Suzuki Katsuhiko
Abstracts of Annual Meeting of the Geochemical Society of Japan 2022 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2022
Language：Japanese Presentation type：Oral presentation (general)
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Development of an evaluation method for Sc/Yb in Hadean zircons.
Takahashi Marika, Yokoyama Shou, Sakata Shuhei, Sawaki Yusuke, Yamamoto Shinji, Fukami Yusuke, Ohno Takeshi, Komiya Tsuyoshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2022 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2022
Language：Japanese Presentation type：Oral presentation (general)
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MORISHITA Tomoaki, FUJIE Gou, HIRAUCHI Ken-ichi, KATAYAMA Ikuo, KOUKETSU Yui, KURODA Jun-ichiro, OKAMOTO Atsushi, ONO Shigeaki, MICHIBAYASHI Katsuyoshi, MORONO Yuki, YAMAMOTO Shinji
Journal of Geography (Chigaku Zasshi) 2021.8 Tokyo Geographical Society
Event date： 2021.8
Language：Japanese Presentation type：Oral presentation (general)
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Trace elements in Hadean zircons indicate the evolution of the early crustal formation process.
Yokoyama Sho, Sakata Shuhei, Niki Souta, Hirata Takafumi, Sawaki Yusuke, yamamoto Shinji, Fukami Yusuke, Ohno Takeshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2021 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2021
Language：Japanese Presentation type：Oral presentation (general)
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Development of highly accurate analysis of trace elements in Zircon using LA-ICP-MS/MS
Yokoyama Sho, Sakata Shuhei, Sawaki Yusuke, Yamamoto Shinji, Fukami Yusuke, Ohno Takeshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2020 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2020
Language：Japanese Presentation type：Oral presentation (general)
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Research proposal for the Hadean geoscience in the Eoarchean high-grade orthogneiss, Mount Sones, Endarby Land, Antarctica
Shinji Yamamoto
The Tenth Symposium on Polar Science National Institute of Polar Research
Event date： 2019.12
Language：English Presentation type：Poster presentation
Venue：National Institute of Polar Research
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An evaluation of impact dating for shocked zircons with planar features (PFs) in the Vredefort dome by LA-ICP-MS multi-spot analysis
山本伸次、加藤大雅
⽇本地球惑星科学連合2019年⼤会 ⽇本地球惑星科学連合
Event date： 2019.5
Language：English Presentation type：Oral presentation (general)
Venue：幕張メッセ
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The Journal of the Geological Society of Japan 2019.2 The Geological Society of Japan
Event date： 2019.2
Language：English Presentation type：Oral presentation (general)
<p>The aim of this study is to addresses unresolved issues associated with the depositional and metamorphic ages of the Sanbagawa metamorphic rocks (central Shikoku, Japan). We performed laser-ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb analysis on psammitic schists from the Sanbagawa metamorphic rocks (sensu stricto) in the Besshi-Asemi-gawa region. Young U-Pb ages of ca. 100-90 Ma were found in all analysed samples, regardless of the metamorphic grade. These results suggest that the Sanbagawa metamorphic rocks from the upper chlorite to oligoclase-biotite zones are metamorphic equivalents of the Cretaceous Northern Shimanto accretionary complex, which also underwent prograde metamorphism after ca. 100-90 Ma. Based on our results and previous geochronological data from the Sanbagawa metamorphic rocks, we suggest that the Sanbagawa metamorphic belt consists of three metamorphic units, which are characterized by different depositional and metamorphic ages. These three units, from old to young, are here referred to as the Besshi, Asemi-gawa, and Oboke units.</p>
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Development of new analytical methods for promoting research on Earth Metallomics
Ohno Takeshi, Sakata Shuhei, Ijichi Yuta, Nakabayashi Kenichi, Fukami Yusuke, Sawaki Yusuke, Yamamoto Shinji
Abstracts of Annual Meeting of the Geochemical Society of Japan 2019 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2019
Language：Japanese Presentation type：Oral presentation (general)
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Zircon U-Pb ages and Geology of Eoarchean rocks in Acasta Gneiss Complex
Uehara Hiroki, Komiya Tsuyoshi, Ishikawa Akira, Yamamoto Shinji, Aoki Shogo, Kon Yoshiaki, Sakata Syuhei
Annual Meeting of the Geological Society of Japan 2018 The Geological Society of Japan
Event date： 2018
Language：Japanese Presentation type：Oral presentation (general)
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Reconstruction of temporal change in mechanism of Hadean magmatism using detrital zircons
Sakata Shuhei, Obayashi Hideyuki, Yamamoto Shinji, Isozaki Yukio, Ohno Takeshi, Hirata Takafumi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2018 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2018
Language：Japanese Presentation type：Oral presentation (general)
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Subducted continental material in deep mantle: Diamond, zircon and rutile separated from peridotite of Horoman, Hokkaido, Japan
Li Yibing, Yang Jinsui, Nida Kiyoaki, Yamamoto Shinji, Lin Yangtin, Li Qiuli, Tian Min, Kon Yoshiaki, Komiya Tsuyoshi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2018 The Geological Society of Japan
Event date： 2018
Language：Japanese Presentation type：Oral presentation (general)
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(Cancel)Detrital chromian spinels from the Jack Hills metasedimentary rocks, Australia
Yamamoto Shinji, Komiya Tsuyoshi
Annual Meeting of the Geological Society of Japan 2018 The Geological Society of Japan
Event date： 2018
Language：Japanese Presentation type：Oral presentation (general)
This presentation has been canceled. Please don't quote this Abstract.
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Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys
Fujisaki Wataru, Sawaki Yusuke, Matsui Yohei, Yamamoto Shinji, Isozaki Yukio, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2018 The Geological Society of Japan
Event date： 2018
Language：Japanese Presentation type：Oral presentation (general)
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The Anatomy of detrital shocked zircons
Yammaoto Shinji
Annual Meeting of the Geological Society of Japan 2017 The Geological Society of Japan
Event date： 2017
Language：Japanese Presentation type：Oral presentation (general)
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Geology, geochronology and geochemistry of the orthogneisses and mafic rocks in Anshan, North China
Uehara Hiroki, Yamamoto Shinji, Kon Yoshiaki, Li Yibing, Jin Wei, Nishizawa Tatsuji, Sakata Syuhei, Ishikawa Akira, Komiya Tsuyoshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2017 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2017
Language：Japanese Presentation type：Oral presentation (general)
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A combined Hf and Zr isotopic study of Hadean zircons: Constraints on early Earth differentiation
Iizuka Tsuyoshi, Itano Keita, Yamamoto Shinji
Abstracts of Annual Meeting of the Geochemical Society of Japan 2017 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2017
Language：Japanese Presentation type：Oral presentation (general)
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Mineral inclusions and magnetic properties of single zircon crystals from the Tanzawa tonalitic pluton
Yamamoto Shinji, Sato Masahiko, Yamamoto Yuji, Ohno Masao, Ysunakawa Hideo
Annual Meeting of the Geological Society of Japan 2016 The Geological Society of Japan
Event date： 2016
Language：Japanese Presentation type：Oral presentation (general)
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Actual conditions of Tectonic erosion in the middle-Late Cretaceous Japan inferred from detrital zircon geochronology
Aoki Kazumasa, Isozaki Yukio, Sakata Shuhei, Sato Tomohiko, Yamamoto Shinji, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2016 The Geological Society of Japan
Event date： 2016
Language：Japanese Presentation type：Oral presentation (general)
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Uehara Hiroki, Yamamoto Shinji, Kon Yoshiaki, Li Yibing, Jin Wei, komiya Tsuyoshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2016 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2016
Language：Japanese Presentation type：Oral presentation (general)
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Mapping Analysis of U-Pb age from Single Zircon Crystal using Laser Ablation-ICP-MS
Hattori Kentaro, Sakata Shuhei, Yamamoto Shinji, Hirata Takafumi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2015 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
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The oldest supracrustal rocks: Implications for early earth evolution
Komiya Tsuyoshi, Yamamoto Shinji, Koshida Keiko, Aoki Shogo, Tashiro Takayuki, Ishikawa Akira
Annual Meeting of the Geological Society of Japan 2015 The Geological Society of Japan
Event date： 2015
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Reinterpretation of geotectonic history of Wales-England area based on Pacific-type orogeny
Asanuma Hisashi, Okada Yoshihiro, Sawaki Yusuke, Yamamoto Shinji, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2015 The Geological Society of Japan
Event date： 2015
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Atmospheric CO2 levels during the Paleoproterozoic global glaciation
Shibuya Takazo, Takai Ken, Yoshida Naohiro, Maruyama Shigenori, Russell Michael, Ueno Yuichiro, Komiya Tsuyoshi, Nishizawa Manabu, Kitajima Kouki, Yamamoto Shinji, Saito Takuya, Matsui Yohei, Kawagucci Shinsuke
Abstracts of Annual Meeting of the Geochemical Society of Japan 2015 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
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Comparison of U-Pb dating of early Archean zircons and 40Ar-39Ar dating for their inclusions
Yamamoto Shinji, Hirata Takafumi, Komiya Tsuyoshi, Koshida Keiko, Hironobu Hyodo, Sato Keiko, Kumagai Hidenori, Shibuya Takazo, Shimojo Masanori, Sakata Shuhei
Abstracts of Annual Meeting of the Geochemical Society of Japan 2015 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
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Zircon U-Pb dating of Dongshan gneiss in Anshan of the North China Craton
Uehara Hiroki, Yamamoto Shinji, Li Yibing, Jin Wei, Kon Yoshiaki, Komiya Tsuyoshi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2015 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
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Shock-metamorphosed zircons recovered from the Jack Hills metaconglomerates in the Narryer Gneiss Complex, Western Australia
Yamamoto Shinji, Komiya Tsuyoshi, Iizuka Tsuyoshi, Shibuya Takazo, Collerson Kenneth
Annual Meeting of the Geological Society of Japan 2015 The Geological Society of Japan
Event date： 2015
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Reappraisal of geochronology of the Itsaq Gneisses in the Isua area
Sato Naoki, Yamamoto Shinji, Sakata Shuhei, Hirata Takafumi, Okamoto Kazuaki, Komiya Tsuyoshi
Annual Meeting of the Geological Society of Japan 2015 The Geological Society of Japan
Event date： 2015
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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FUJISAKI Wataru, SAWAKI Yusuke, YOKOYAMA Tetsuya, YAMAMOTO Shinji, MARUYAMA Shigenori
BUNSEKI KAGAKU The Japan Society for Analytical Chemistry
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
The cause of mass extinctions during the Phanerozoic period has been a long standing problem in geology. The large magmatic activity (CAMP: Central Atlantic Magmatic Province) associated with the breakup of Pangaea or a bolide impact event would have led the mass extinction at the Triassic–Jurassic (T–J) boundary. However, the cause of the mass extinction is still controversial because of insufficient geological evidences. In this study, we conducted detailed geological survey of the Inuyama area where good exposure of deep-sea sediments across the T–J boundary is observed. We collected rock samples bed-by-bed to analyze the abundances of platinum group elements (PGEs) with a high spatial resolution. Twenty-eight samples were powdered and spiked with <sup>99</sup>Ru, <sup>105</sup>Pd, <sup>190</sup>Os, <sup>191</sup>Ir, <sup>194</sup>Pt. The sample was digested by a 2 : 1 mixture of HNO<sub>3</sub> and HCl in a sealed Carious tube at 240°C for 48 hours. After chemical separation using an anion exchange resin, PGEs (except for Os) were measured by a quadrupole type inductively coupled plasma-mass spectrometry (ICP-MS). The PGEs concentrations were determined by the isotope dilution method. After solvent extraction with CCl<sub>4</sub> and HBr, micro-distillation method was employed to purify Os. The Os isotopes were determined by Negative-Thermal Ionization Mass Spectrometry (N-TIMS). The relationship between Pd/Pt and Ir/Pt, as well as the PGE patterns, demonstrate that the high PGEs contents in shales can be explained by the incorporation of basaltic rocks supplied from CAMP. In addition, compared with fossil records, the highest PGE abundances (Os and Pd) are discovered from a shale just above the chert including the first appearance of Jurassic type radiolarian. These lines of evidence indicate that the CAMP volcanism would have contributed to the mass extinction at the T–J boundary.
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Yamamoto Shinji, Komiya Tsuyoshi, Iiduka Tsuyoshi, Shibuya Takazo, Collerson Kenneth
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2015 Japan Association of Mineralogical Sciences
Event date： 2015
Language：Japanese Presentation type：Oral presentation (general)
Shock-metamorphosed zircons were recovered from the Jack Hills metaconglomerate in the in the Narryer Gneiss Complex, Western Australia. A total of 8993 detrital zircons were investigated for their external and internal structures using a SEM and optical microscope, and four types of shock-metamorphosed zircons were identified; (1) curviplanar features, (2) single or multiple sets of planar features, (3) partly granular features, and (4) fully granular features. Of these four, planar feature is the most diagnostic evidence for impact origin and preserved as annealed parallel fractures and deformation lamellae.
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Demonstration of the Pacific-type orogeny forming northwest Wales region, U.K.
Asanuma HIsashi, Okada Yoshihiro, Sawaki Yusuke, Shinji Yamamoto, Hirata Takafumi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2014 The Geological Society of Japan
Event date： 2014
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Anatomy and chronology of the detrital shocked zircons
Yamamoto Shinji, Komiya Tsuyoshi, Sakata Shuhei, Hattori Kentaro, Hirata Takafumi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2014 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2014
Language：Japanese Presentation type：Oral presentation (general)
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Aoki Kazumasa, Sato Tomohiko, Yamamoto Shinji, Sakata Shuhei, Hirata Takafumi
Annual Meeting of the Geological Society of Japan The Geological Society of Japan
Event date： 2014
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Relationships among depositional environment, stratigraphy and geochemistry of the oldest BIFs in the Eoarchean-aged Nulliak supracrustal belts
Aoki Shogo, Yamamoto Shinji, Hirata Takafumi, Komiya Tsuyoshi
Annual Meeting of the Geological Society of Japan 2014 The Geological Society of Japan
Event date： 2014
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Redox changes in the Panthalassa ocean from the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements in deep-sea sediments of Mino-Tanba belt, SW Japan
Fujisaki Wataru, Sawaki Yusuke, Sawada Hikaru, Sato Tomohiko, Yamamoto Shinji, Akahori Hoshimitsu, Yanai Shuichi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2014 The Geological Society of Japan
Event date： 2014
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Komiya Tsuyoshi, Yamamoto Shinji, Aoki Shogo, Tashiro Takayuki, Ishikawa Akira, Hori Masako, Ishida Akizumi, Sano Yuji, Hirata Takafumi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2014 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2014
Language：Japanese Presentation type：Oral presentation (general)
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KON YOSHIAKI, KOMIYA TSUYOSHI, ANMA RYO, HIRATA TAKAFUMI, SHIBUYA TAKAZO, YAMAMOTO SHINJI, MARUYAMA SHIGENORI
Geochemical journal : journal of the Geochemical Society of Japan 一般社団法人日本地球化学会
Event date： 2013.4
Language：English Presentation type：Oral presentation (general)
Geochemical compositions are reported for Late Miocene to Pliocene granitoids from the Taitao Peninsula near the Chile ridge subduction zone. Major element compositions of Taitao granitoids show a resemblance with those of TTG suites. However, trace element compositions are characterized by low Sr (50-300 ppm), moderately high Y (10-45 ppm) and Yb concentrations (1-5 ppm), and low Sr/Y and La/Yb ratios compared with those of typical adakites, which are presumably produced by melting of young and hot oceanic crust under eclogite to garnet amphibolite conditions. Instead, trace element composition of the Taitao granitoids resembles that of typical calc-alkaline arc magmas. Based on trace element compositions, together with tectonic constraints, we infer that the Taitao granitoids were generated by partial melting of the subducted oceanic crust in garnet-free amphibolite conditions at depths shallower than 30 km. Our results indicate that slab-melting-related magmas do not necessarily show a HREE-depleted signature, which was used as evidence for slab-melting for granitic rocks of the TTG suites.
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Platinum group element anomalies in the Triassic-Jurassic deep-sea sediments
Fujisaki Wataru, Sawaki Yusuke, Yamamoto Shinji, Yokoyama Tetsuya, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2013 The Geological Society of Japan
Event date： 2013
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Apatite inclusions and shock-metamorphic texture in Hadean detrital zircon
Yamamoto Shinji, Komiya Tsuyoshi, Sakata Shuhei, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2013 The Geological Society of Japan
Event date： 2013
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Komiya Tsuyoshi, Yamamoto Shinji, Shimojo Masanori, Aoki Shogo
Abstracts of Annual Meeting of the Geochemical Society of Japan 2013 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2013
Language：Japanese Presentation type：Oral presentation (general)
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Geology and Geochemistry of the Eoarchaean BIFs, Northern Labrador: The oldest BIF in the earth
Aoki Shogo, Shimojo Masanori, Shinji Yamamoto, Hirata Takafumi, Komiya Tsuyoshi
Annual Meeting of the Geological Society of Japan 2013 The Geological Society of Japan
Event date： 2013
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Hadean crust inferred from apatite inclusions in Hadean detrital zircon
Yamamoto Shinji, Komiya Tsuyoshi, Sakata Shuhei, Hirata Takafumi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2013 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2013
Language：Japanese Presentation type：Oral presentation (general)
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Suzuki Kazue, Maruyama Shigenori, Yamamoto Shinji, Li Yibing, Hirata Takeshi, Kon Yoshiaki, Kato Yasuhiro, Fujinaga Koichiro, Takaya Yutaro, Omori Soichi
Abstracts of Annual Meeting of the Geochemical Society of Japan 2013 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2013
Language：Japanese Presentation type：Oral presentation (general)
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深部マントルへの新しい扉 : 南チベット, ルオブサオフィオライトにおけるポディフォームクロミタイト
山本 伸次, 徐 向珍, 楊 経綏
地學雜誌 公益社団法人 東京地学協会
Event date： 2012.2
Language：English Presentation type：Oral presentation (general)
 ルオブサオフィオライトに産するポディフォームクロミタイトからは，これまで数多くの"異常な"鉱物が見いだされている。それらは，マイクロダイヤモンドを含む種々の超高圧鉱物や，金属相などの還元的鉱物，そしてクロマイト中におけるディオプサイドやコーズ石などの異常な珪酸塩離溶相などである。これらの鉱物学的証拠は，本ポディフォームクロミタイト岩体が超深部マントル（おそらく380km以深）由来であることを強く示唆する。したがって，ルオブサオフィオライトにおけるポディフォームクロミタイトは，これまで手の届かなかった深部マントルに関する重要な知見をもたらすであろう。
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Geology and geochronology of northern Labrador, Canada
Shimojo Masanori, Yamamoto Shinji, Maki Kenshi, Sakata Shuhei, Sawaki Yusuke, Aoki Kazumasa, Ishikawa Akira, Okada Yoshihiro, Hirata Takafumi, Komiya Tsuyoshi
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Recycled crustal zircons from podiform chromitites in the Luobusa ophiolite, southern Tibet
Yamamoto Shinji, Komiya Tsuyoshi, Kon Yoshiaki, Hirata Takafumi, Shigenori Maruyama, Yang Jing-Sui, Robinson Paul
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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A granite classification system by zircon U-Pb dating using LA-ICP-MS
Suzuki Kazue, Yamamoto Shinji, Kon Yoshiaki, Maki Kenshi, Hirata Takafumi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Deep sea sediments of Mainoan Snowball Earth in Lleyn, Wales, U.K.
Okada Yoshihiro, Yamamoto Shinji, Windley Brian F., Shimojo Masanori, Saito Takuya, Fujisaki Wataru, Maki Kenshi, Hirata Takafumi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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A texture peculiar to ultra-high pressure podiform chromitites?
Arai Shoji, Miura Makoto, Yamamoto Shinji, Shmelev Vladimir R.
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2012 Japan Association of Mineralogical Sciences
Event date： 2012
Language：Japanese Presentation type：Oral presentation (general)
A texture possibly peculiar to ultra-high pressure podiform chromitites has been found from the Luobusa ophiolite, Tibet as well as from Ray-Iz, the Polar Urals. They show a kind of brecciated texture; fresh olivine filling fractures of chromian spinel grains. Such a texture has not been recognized from ordinary low-pressure chromitites, possibly indicating the history of the ultra-high pressure chromitites, namely, their solid-state uprise from deeper parts of the mantle. It is possibly in accordance with the deep recycling origin for the ultra-high pressure chromitites (Arai, 2010).
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A lesson from SW Japan: Geochronological constraints on the formation of the Barrovian metamorphic zones and Caledonian granitoids in the Grampians of Scotland
Suzuki Kazue, Aoki Kazumasa, Yamamoto Shinji, Maki Kenshi, Hirata Takafumi, Windley Brian. F, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Ediacaran-Cambrian accretion tectonics of Anglesey and Lleyn Peninsula, Wales, U.K.: Reconstruction of ocean-plate stratigraphy (OPS) and detrital zircon chronology
Okada Yoshihiro, Yamamoto Shinji, Windley Brian F., Fujisaki Wataru, Saito Takuya, Aoki Kazumasa, Hirata Takafumi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2012 The Geological Society of Japan
Event date： 2012
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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ISOZAKI Yukio, MARUYAMA Shigenori, NAKAMA Takaaki, YAMAMOTO Shinji, YANAI Shuichi
Journal of Geography (Chigaku Zasshi) Tokyo Geographical Society
Event date： 2011.2
Language：Japanese Presentation type：Oral presentation (general)
 The <i>ca.</i> 700 million year-long geotectonic history of the Japanese Islands comprises three distinct intervals; <i>i.e.</i>, (1) the age of a passive continental margin off the South China continental margin (<i>ca.</i> 700-520 Ma), (2) the age of an active margin characterized by an arc-trench system (<i>ca.</i> 520-20 Ma), and (3) the age of an island arc off East Asia (20 Ma to the present). These three intervals are chronologically separated by two major boundaries with significant tectonic episodes; <i>i.e.</i>, the <i>ca.</i> 520 Ma tectonic inversion from a passive to an active margin by the initiation of subduction from the Pacific side, and the <i>ca.</i> 20 Ma tectonic isolation of the modern island arc system from the Asian margin by the back-arc basin (Japan Sea) opening. Here, the evolutionary history of the Japanese Islands is revised significantly on the basis of new lines of information that derived from a new dating technique of detrital zircon in sandstone. Particularly noteworthy is the recognition of the Early Paleozoic to Middle Mesozoic arc batholiths that were exposed extensively in the past but not at all at present because the pre-Cretaceous granites merely occur as kilometer-size blocks in the modern Japanese Islands. As to these older granites, the remarkable disagreement between the current distribution and the predominance of their clastic grains in younger sandstones suggests the effectiveness of past tectonic erosion processes in the fore-arc domains. The newly documented historical change in sandstone provenance suggests that proto-Japan has experienced not only accretionary growth but also large-scale tectonic erosion in multiple stages. During the <i>ca.</i> 500 million-year history of the Japanese Islands, a large amount of juvenile arc (continental) crust was formed several times, however, most has already disappeared from the Earth's surface. In short, the orogenic growth of Japan, even in a long-lasting active continental margin setting, is explained as the intermittent repetition of ocean-ward continental growth and continent-ward contraction of an active arc-trench system.<br> In contrast to these arc batholiths, the terrigenous flux from the neighboring two major continental blocks (South and North China) was less significant than previously imagined, except for the Jurassic to Early Cretaceous time when the collisional suture between North and South China blocks was selectively eroded to produce abundant terrigenous clastics. It is also significant that the eastern extension of this collisional suture was recognized in Japan as a chain of fragmentary remnants of the Triassic medium-pressure metamorphic belt. On the basis of these new lines of information, the South China-related origin of the main part of Japan is confirmed, whereas the Hida and Oki belts along the Japan Sea are identified as detached fragments of North China block.<br> Summarizing all of these results, a series of revised paleogeographic maps of Japan from the Late Neoproterozoic to the Miocene is illustrated.
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History of the oceanic plate and interpretation of accretionary mechanisms from Triassic-Jurassic deep-sea deposits in Kisogawa, Inuyama area, Japan
Fujisaki Wataru, Takeda Mitsutaka, Yamamoto Shinji, Miyahara Hiroko, Kataoka Ryuho, Saitou Takuya, Nakane Fumiko, Chikaraishi Yusuke, Ogasa Hiroki, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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Detrital zircon chronology: its benefits and future scope
Yamamoto Shinji, Komiya Tsuyoshi, Isozaki Yukio, Aoki Kazumasa, Rino Syuji, Nakama Takaaki, Maruyama Shigenori, Maki Kenshi, Yokoyama Takaomi, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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Tectonic development of Buchan metamorphic unit and Ballantrae complex in Scotland, UK: Interpretation of detrital zircon ages from sedimentary rocks
SUZUKI Hiroaki, YAMAMOTO Shinji, AOKI Kazumasa, KON Yoshiaki, MARUYAMA Shigenori
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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Geotectonic evolution of Japan revisited: alternate growth and shrinkage of arc crust
Isozaki Yukio, Aoki Kazumasa, Yamamoto Shinji, Nakama Takaaki, Maruyama Shigenori, Omori Soichi
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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Zircon response to tectonic erosion of Cretaceous tectonics in Japan
Aoki Kazumasa, Yamamoto Shinji, Isozaki Yukio, Maki Kenshi, Yokoyama Takaomi, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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Komiya Tsuyoshi, Shimojo Masanori, Yamamoto Shinji, Sawaki Yusuke, Ishikawa Akira, Aoki Kazumasa
Abstracts of Annual Meeting of the Geochemical Society of Japan 2011 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2011
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Petrological characteristics of mafic enclaves in the Yule Batholith, the Mount Edgar Batholirh and the Shaw Batholith, Pilbara Block, Western Australia
Suzuki Kazue, Yamamoto Shinji, Yokoyama Takaomi, Hirata Takahumi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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In-situ iron isotope analyses of pyrites from 3.5 to 3.2 Ga sedimentary rocks of the Barberton Greenstone Belt, Kaapvaal Craton
Yoshiya Kazumi, Sawaki Yuusuke, Shibuya Takazo, Yamamoto Shinji, Komiya Tsuyoshi, Maruyama Shigenori, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2011 The Geological Society of Japan
Event date： 2011
Language：Japanese Presentation type：Oral presentation (general)
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SUZUKI Kazue, MARUYAMA Shigenori, YAMAMOTO Shinji, OMORI Soichi
Journal of Geography (Chigaku Zasshi) Tokyo Geographical Society
Event date： 2010.12
Language：Japanese Presentation type：Oral presentation (general)
 The Japanese Islands have long been considered to be the most evolved of all the island arcs in the oceans. A simple scenario has been implicitly accepted for the growth of the Japanese Islands: since subduction started sometime around 520 Ma, the TTG crust has increased over time in association with the steady-state growth of the accretionary prism in front. Here, we show very different dynamic growths of TTG crusts over time than previously thought, <i>i.e.</i>, four times more TTG crusts than at present must have gone into the deep mantle due to tectonic erosion, which occurred six times since subduction was initiated at 520 Ma. Tectonic erosion is a major process that has controlled the development history of the Japanese islands. It can be traced as a serpentinite mélange belt, which indicates the upper boundary of past extensive tectonic erosion.
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Tectonic Erosion : New Perspectives on Pacific-type Orogeny and Continental Growth Models
YAMAMOTO Shinji
Journal of Geography (Chigaku Zasshi) Tokyo Geographical Society
Event date： 2010.12
Language：Japanese Presentation type：Oral presentation (general)
 This is a brief review of tectonic erosion originally proposed by von Huene and Scholl (1991) who have spent most of their academic careers studying marine geophysics along the circum-Pacific subduction zone.<br> Accretionary complex is considered to be formed by trench turbidite resting on the subducting oceanic plate that accretes against a hanging wall at a shallow or deep crustal level due to off-scraping or underplating. This concept was introduced to Japan in the early 1970s and was developed in great detail to propose a new paradigm for accretionary geology that involves ocean-plate stratigraphy. Later, identification of accretionary complex on-land in Japan became the mainstream. A new idea refutes the common occurrence of an on-going accretion process forming accretionary complexes along the circum-Pacific subduction zone. Instead, the concept of tectonic erosion has emerged to explain extensive crustal thinning and subsidence as an on-going process destroying the hanging wall of an older subduction complex or even the basement of the overriding plate at more than half of the active trench.<br> During the past three decades, marine geophysicists and geologists have documented tectonic erosion as a more common process than the formation of an accretional complex in subduction zones, and supeculate that a large volume of the continental crust is subducted into the mantle at both accretionary and erosive convergent margins. A simple calculation of the amount of subducting continental material versus arc producted at the subduction zone suggests a balance, resulting in no growth of continental crust at present (<i>e.g.</i> Clift and Vannuchi, 2004; Scholl and von Huene, 2007). However, considering direct subduction of intra-oceanic arcs and foundering of the continental lower crust into the mantle, we must conclude there is negative growth of the continental crust on the Earth at present.
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Goto Kosuke, Sekine Yasuhito, Suzuki Katsuhiko, Tajika Eiichi, Senda Ryoko, Nozaki Tatsuo, Tada Ryuji, Goto Kazuhisa, Yamamoto Shinji
Abstracts of Annual Meeting of the Geochemical Society of Japan 2010 GEOCHEMICAL SOCIETY OF JAPAN
Event date： 2010
Language：The in addition, foreign language Presentation type：Oral presentation (general)
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Processes of continental decrease in a subduction zone: Arc subduction and tectonic erosion
Yamamoto Shinji, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2010 The Geological Society of Japan
Event date： 2010
Language：Japanese Presentation type：Oral presentation (general)
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Age distribution of zircon from mafic xenolith in granite and its significance: a case study in the Tanzawa tonalite
Suzuki Kazue, Yamamoto Sinji, Li Yibing, Hirata Takafumi, Kon Yoshiaki, Kato Yasuhiro, Fujinaga Kouichiro, Takaya Yutaro, Omori Soichi, Maruyama Shigenori
Annual Meeting of the Geological Society of Japan 2010 The Geological Society of Japan
Event date： 2010
Language：Japanese Presentation type：Oral presentation (general)
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Zircon from big-garnet amphibolite, Gore Mountain, Adirondack, NY
Omori Soichi, Sato Kei, Yamamoto Shinji, Miyashita Atsushi, Hayashi Mamoru, Shigenori Maruyama
Annual Meeting of the Geological Society of Japan 2009 The Geological Society of Japan
Event date： 2009
Language：Japanese Presentation type：Oral presentation (general)
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U-Pb dating of zircons in granulite facies rocks from Achankovil Shear Zone in southern India using LA-ICP-MS
Sato Kei, Santosh M, Tsunogae Toshiaki, Kon Yoshiaki, Yamamoto Shinji, Hirata Takafumi
Annual Meeting of the Geological Society of Japan 2008 The Geological Society of Japan
Event date： 2008
Language：Japanese Presentation type：Oral presentation (general)
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Micro-analysis on ultrahigh-pressure minerals with an ATEM, FE-EPMA and Laser-Raman.
Shinji Yamamoto, Akiyama Daisuke, Hirose Kei, Komiya Tsuyoshi, Maruyama Shigenori, Collerson Ken
Annual Meeting of the Geological Society of Japan 2008 The Geological Society of Japan
Event date： 2008
Language：Japanese Presentation type：Oral presentation (general)
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吉崎 もと子, 鈴木 勝彦, 中村 謙太郎, 山口 耕生, 渋谷 岳造, 山本 伸次, 大森 聡一, 高井 研, 丸山 茂徳
日本地球化学会年会要旨集 2008 一般社団法人日本地球化学会
Event date： 2008
Language：Japanese Presentation type：Oral presentation (general)
近年、インド洋中央海嶺の海洋底熱水活動域(Kairei フィールド)にて水素を主なエネルギー源とする独立栄養微生物生態系の存在が発見された微生物生態系の存在様式と生息環境は、地質学的研究から予想される太古代の海洋底及び海底熱水活動と整合し、かつ生物系統学や進化生化学の見地から推測される極めて原始的な微生物系統ならびに代謝様式にも合致することから、この微生物生態系とそれを支える熱水活動が、原始地球の最古の生態系とそのゆりかごであったことが指摘された。その栄養源となる水素の無機的な発生源として考えられるのがカンラン岩の蛇紋岩化反応である。 本研究では、カンラン岩の蛇紋岩化反応を室内で精密に再現するために、バッチ型熱水実験システムの改良、及びフロー型実験装置の導入を行い、新たな実験システムの立ち上げを行った。
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S-36 Zircon U-Pb ages and UHP minerals from podiform chromitites in the Luobusa ophiolite, Tibet : Implications for material circulation in the mantle
Yamamoto S., Komiya T., Maruyama S.
Annual Meeting of the Geological Society of Japan 2006 The Geological Society of Japan
Event date： 2006
Language：English Presentation type：Oral presentation (general)
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Extraction of lung blood vessels from chest X-ray CT image
FUKANO Gentaro, TAKIZAWA Hotaka, YAMAMOTO Shinji, NAKAGAWA Tohru, MATSUMOTO Tohru, TATENO Yukio, IINUMA Takeshi, MATSUMOTO Mitsuomi
IEICE technical report. The Institute of Electronics, Information and Communication Engineers
Event date： 2001.1
Language：Japanese Presentation type：Oral presentation (general)
In this paper, we suggest automatic extraction method of lung blood vessels from X-ray CT image and reducing false positive cancer candidates. First, the ridge area is emphasized by using the Tophat-by-Partial Reconstruction Method which is a kind of the Mathematical Morphology filter. And then, only the blood vessel area has been selectively extracted by using the distance transformation. Finally, if a cancer candidate is on the blood vessel area, the candidate eliminates. This method was applied to the 93 cases. The rate of reduction was 60%.