Updated on 2022/08/10

写真a

 
HIDAKA, Yoshihiro
 
Affiliation
Faculty of Education and Integrated Arts and Sciences, School of Education
Job title
Assistant Professor(without tenure)
 

Papers

  • Siderophile element characteristics of acapulcoite-lodranites and winonaites: Implications for the early differentiation processes of their parent bodies.

    Y. Hidaka, N. Shirai, A. Yamaguchi, M. Ebihara

    Meteoritics & Planetary Science   54 ( 5 ) 1153 - 1166  2019  [Refereed]

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    We have studied magnetic fractions of five acapulcoites, three lodranites, and two winonaites to investigate chemical compositions of their precursor materials and metallic partial melting processes occurring on their parent bodies. One winonaite metal is similar in composition to low Au, low Ni IAB iron subgroup, indicating genetic relationship between them. Magnetic fractions of chondrule-bearing acapulcoite and winonaite have intermediate chemical compositions of metals between H chondrites and EL chondrites. This fact indicates that the precursor materials of acapulcoite-lodranites and winonaites were similar to H and/or EL chondrites in chemical compositions. Magnetic fractions in acapulcoite-lodranites have a large variety of chemical compositions. Most of them show enrichments of W, Re, Ir, Pt, Mo, and Rh, and one of them shows clear depletion in Re and Ir relative to those of chondrule-bearing acapulcoite. Chemical compositional variations among acapulcoite-lodranite metals cannot be explained by a single Fe-Ni-S partial melting event, but a two-step partial melting model can explain it.

    DOI

  • Further evidence for an impact origin of the Tsenkher structure in the Gobi-Altai, Mongolia: geology of a 3.7 km crater with a well-preserved ejecta blanket

    G. Komatsu, J. Ormo, T. Bayaraa, T Arai, K. Nagao, Y. Hidaka, N. Shirai, M. Ebihara, C. Alwmark, L. Geraltsetseg, S. Tserendug, K. Goto, T. Matsui, S. Demberel

    Geological Magazine   156 ( 1 ) 1 - 24  2019  [Refereed]

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    © 2017 Cambridge University Press. The Tsenkher structure in the Gobi-Altai, Mongolia is a c. 3.7 km diameter crater with a well-preserved ejecta blanket. It has been hypothesized to be either of impact or volcanic origin in our previous work. Observations during our 2007 expedition and related sample analyses give further support for an impact origin. The evidence includes the presence of a structurally uplifted near-circular rim surrounded by an ejecta blanket, and abundant breccias, some of which are melt- A nd millimetre-scale spherule-bearing. Planar deformation features (PDFs) were found in one quartz grain in a breccia sample. Fe-rich grains are found in a vesicular melt sample that is also characterized by elevated platinum group element (PGE) abundances with respect to the sedimentary bedrock of the area (approximately an order of magnitude). Noble gas analysis of one breccia sample yielded an elevated 3 He/ 4 He value of (5.0±0.2) × 10 -6 . Although not conclusive alone, these geochemical results are consistent with a contribution of meteoritic components. A volcanic origin, in particular a maar formation, would require explanations for the unusual conditions associated with Tsenkher, including its large size occurring in isolation, the structurally uplifted rim and the lack of a bedded base surge deposit. A pronounced rampart structure observed at the eastern ejecta is also unusual for any volcanic origin. 40 Ar- 39 Ar dating of a vesicular melt sample gives an age of the Tsenkher structure of 4.9±0.9 Ma. The rampart structure could provide insights into the formation of similar ejecta morphologies associated with numerous impact craters on Mars.

    DOI

  • Determination of siderophile and chalcophile elements in NIST SRM 610 and 612 using laser and solution based ICP-MS analyses

    Shirai Naoki, Hidaka Yoshihiro, Yamaguchi Akira, Ebihara Mitsuru

    Abstracts of Annual Meeting of the Geochemical Society of Japan   64   259 - 259  2017

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    DOI CiNii

  • Neutron activation analysis of iron meteorites

    Naoki Shirai, Yoshihiro Hidaka, Akira Yamaguchi, Shun Sekimoto, Mitsuru Ebihara, Hideyasu Kojima

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY   303 ( 2 ) 1375 - 1380  2015.02  [Refereed]

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    A simple and effective instrumental neutron activation analysis for iron meteorites is presented in this study. In order to design the analytical procedure, self-absorption of gamma-rays on samples, interfering nuclides and their respective reactions were examined. Seventeen elements (Fe, Co, Ni, Cu, Ga, Ge, As, Mo, Ru, Rh, Sb, W, Re, Os, Ir, Pt and Au) could be nondestructively determined in Canyon Diablo and Cape York iron meteorites. Our data of these two iron meteorites are consistent with the corresponding literature values. This study confirms that our analytical procedure with INAA is simple and effective in classification of iron meteorites.

    DOI

  • Lunar meteorite, Dhofar 1428: Feldspathic breccia containing KREEP and meteoritic components

    Yoshihiro Hidaka, Akira Yamaguchi, Mitsuru Ebihara

    METEORITICS & PLANETARY SCIENCE   49 ( 5 ) 921 - 928  2014.05  [Refereed]

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    We have studied the feldspathic lunar meteorite Dhofar 1428 chemically and petrologically to better understand the evolution of the lunar surface. Dhofar 1428 is a feldspathic regolith breccia derived from the lunar highland. Bulk chemical and mineral compositions of Dhofar 1428 are similar to those of other feldspathic lunar meteorites. We found a few clasts of evolved lithologies, such as K-rich plagioclases and quartz monzogabbro. Dhofar 1428 contains approximately 1 wt% of chondritic materials like CM chondrite on the basis of abundances of platinum group elements (Ru, Rh, Pd, Os, Ir, and Pt).

    DOI

  • Deep-sea record of impact apparently unrelated to mass extinction in the Late Triassic

    Tetsuji Onoue, Honami Sato, Tomoki Nakamura, Takaaki Noguchi, Yoshihiro Hidaka, Naoki Shirai, Mitsuru Ebihara, Takahito Osawa, Yuichi Hatsukawa, Yosuke Toh, Mitsuo Koizumi, Hideo Harada, Michael J. Orchard, Munetomo Nedachi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 47 ) 19134 - 19139  2012.11  [Refereed]

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    The 34-million-year (My) interval of the Late Triassic is marked by the formation of several large impact structures on Earth. Late Triassic impact events have been considered a factor in biotic extinction events in the Late Triassic (e. g., end-Triassic extinction event), but this scenario remains controversial because of a lack of stratigraphic records of ejecta deposits. Here, we report evidence for an impact event (platinum group elements anomaly with nickel-rich magnetite and microspherules) from the middle Norian (Upper Triassic) deep-sea sediment in Japan. This includes anomalously high abundances of iridium, up to 41.5 parts per billion (ppb), in the ejecta deposit, which suggests that the iridium-enriched ejecta layers of the Late Triassic may be found on a global scale. The ejecta deposit is constrained by microfossils that suggest correlation with the 215.5-Mya, 100-km-wide Manicouagan impact crater in Canada. Our analysis of radiolarians shows no evidence of a mass extinction event across the impact event horizon, and no contemporaneous faunal turnover is seen in other marine planktons. However, such an event has been reported among marine faunas and terrestrial tetrapods and floras in North America. We, therefore, suggest that the Manicouagan impact triggered the extinction of terrestrial and marine organisms near the impact site but not within the pelagic marine realm.

    DOI

  • 化学組成から見た始原的エコンドライト母天体における部分溶融過程

    日高 義浩

    首都大学東京大学院  

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Misc

  • POSSIBLE LINKAGE BETWEEN PRIMITIVE ACHONDRITES AND EL CHONDRITES FROM SIDEROPHILE ELEMENT CHARACTERISTICS OF ACAPULCOITE-LODRANITES AND WINONAITES

    Y. Hidaka, A. Yamaguchi, N. Shirai, M. Ebihara

    METEORITICS & PLANETARY SCIENCE   47   A184 - A184  2012.07

    Research paper, summary (international conference)  

  • TRACE ELEMENT CHARACTERISTICS OF A LUNAR METEORITE DHOFAR 1428

    Y. Hidaka, A. Yamaguchi, M. Ebihara

    METEORITICS & PLANETARY SCIENCE   45   A81 - A81  2010.07

    Research paper, summary (international conference)  

  • GEOCHEMISTRY AND PETROLOGY OF LUNAR METEORITE DHOFAR 1428

    Y. Hidaka, A. Yamaguchi, M. Ebihara

    METEORITICS & PLANETARY SCIENCE   44   A91 - A91  2009.07

    Research paper, summary (international conference)  

Specific Research

  • 岩石・隕石試料の化学組成分析

    2020  

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    誘導結合プラズマ質量分析計 (ICP-MS) や実験室の維持管理に必要な消耗品類や実験器具の購入に必要な費用の捻出を行えたため、装置の定常運用が可能となり、希土類元素測定や親鉄・親銅元素測定のための実験を行う環境を整えることが出来た。それにより実試料の分析を行い、本年度は環境試料測定、地球岩石の希土類元素測定、親鉄・親銅元素組成測定などを行った。

  • 岩石・隕石試料の主要および微量元素測定

    2019  

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    昨年度に移管した誘導結合プラズマ質量分析計 (ICP-MS) や実験室の維持管理に必要な消耗品類や実験器具の購入に必要な費用の捻出を行えたため、装置の定常運用が可能となり、希土類元素測定や親鉄・親銅元素測定のための実験を行う環境を整えることが出来た。それにより実試料の分析を開始し、本年度はCBおよびCHコンドライト隕石についての確度の良い親鉄・親銅元素の全岩組成を得ることが出来た。その他、地球の岩石試料の希土類元素分析への着手も開始しており、分析例の少ない標準試料の高確度・高精度の希土類元素組成情報を得られるよう、継続して実験を行っている。

 

Syllabus