初期地球進化解読

2016 Fiscal Year Annual Research Report

• Project/Area Number: 26220713
• Research Institution: The University of Tokyo
• Principal Investigator: 小宮 剛 東京大学, 大学院総合文化研究科, 准教授 (30361786)
• Co-Investigator(Kenkyū-buntansha): 横山 哲也 東京工業大学, 理学院, 教授 (00467028) ; 片山 郁夫 広島大学, 理学研究科, 教授 (10448235) ; 飯塚 毅 東京大学, 大学院理学系研究科(理学部), 准教授 (70614569)
• Project Period (FY): 2014-05-30 – 2019-03-31
• Keywords: 初期地球 / 冥王代 / 初期マントル大規模分化 / 消滅核種同位体進化解読 / 初期地球表層環境進化 / 最古の生命の痕跡

Outline of Annual Research Achievements

アカスタ片麻岩体の苦鉄質岩にRe-Os同位体系を適用し、その玄武岩マグマの形成年代（約42.7億年前）と形成時のOs同位体の初期値（0.4±1.1）を得た。得られた年代は、現存する地球最古の岩石の年代となる。アカスタ片麻岩体の苦鉄質岩は、NbやTaに負異常があること以外は、未分化マントル的な液相濃集元素パターンを持つ。NbやTaは核形成時に親鉄性の挙動をすることが知られており、その負異常はそのソースマントルが核形成時の分化の痕跡を残存していたことを示唆する。また、それは極めて高いOs初期値とも調和的である。また、その苦鉄質岩は現在の地球マントルのε142Nd値と同じ値を有することがわかった。その苦鉄質岩が未分化マントル的な親石性・液相濃集元素パターンを有することとε142Nd値に異常が見られないことから、地球のマントルは、42.7億年前には再均質化を受け、初期大規模分化の痕跡が一部を除き、消滅していたことを示唆する。また、その化学的特徴は地球の材料物質が普通や炭素質コンドライトとは異なり、エンスタタイトコンドライト的なε142Nd値を持っていたことを示す。
カナダ・ヌブアギツック表成岩帯の地質調査を行った。本地域は、これまでに147Sm/144Nd-142Nd/144Ndの擬似アイソクロン年代によって冥王代物質の存在が示唆されている地域である。しかし、その年代が真の火成年代なのか、複数の端成分の混合によるのかは、今なお議論がされている。私たちの地質調査に基づく新たな知見は主に三つあり、一つ目は本地域の苦鉄質岩体には極めて多数の珪長質貫入岩が存在すること、二つ目は従来の研究では超塩基性岩体は貫入岩であるとされたが噴出岩由来であること、三つ目は縞状鉄鉱層や礫岩の分布を詳細に記載したことである。一つ目の結果は、その擬似アイソクロンが混合によるものであることを示唆する。

Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

本年度の研究成果は、現存する最古の岩石であるアカスタ片麻岩体の苦鉄質岩から、Re-Os年代、Os同位体初期値、未分化マントルに比べてNbとTaに枯渇、NbとTaを除き未分化マントル的な液相濃集元素パターンやε142Nd値が新規に得られたことである。それぞれ、約42.7億年前という地球最古の岩石の年代、後期隕石重爆撃前の核形成の痕跡を示唆する極めて高いOs同位体比、核形成の痕跡、マントルの再均質化が42.7億年前以前に起きたことと地球の材料物質がエンスタタイトコンドライト質であったことを示す。地球の材料物質の特定や大規模初期分化の再均質化の時期の推定は本プロジェクトの当初予定の中核をなすものである。それらについて、新たな知見が得られたことは本研究が順調に進められていることを示す。

Strategy for Future Research Activity

平成29年度は、西グリーンランド、イスア表成岩帯の地質調査を行い、特に表成岩帯内部の地質調査と超塩基性岩、苦鉄質岩や堆積岩の試料採取を行う。最近、本地域でストロマトライト状構造を有する炭酸塩岩が報告されたので、その起源を地質学的、地球化学的に探求する。また、高精度Nd同位体分析をアカスタ片麻岩体苦鉄質岩に加えて、カナダ・ラブラドル・サグレック岩体のヌリアック表成岩帯の苦鉄質岩や北中国アンシャン地域の苦鉄質岩に適用し、初期マントル進化について読み解く。
カナダ・ラブラドル・サグレック岩体やグリーンランドイスア地域の炭酸塩岩や縞状鉄鉱層の微量元素を分析し、冥王代から初期太古代の海洋組成を推定する。また、サグレック岩体の泥質岩中の炭質物の微量元素組成や窒素同位体、さらに、それに伴う硫化物のFe同位体を分析し、それらの炭質物の由来となった生命種の特定を進める。

Research Products

• [Int'l Joint Research] The Australian National University/The University of Queensland(Australia)
  • Country Name: Australia
  • Counterpart Institution: The Australian National University/The University of Queensland
• [Int'l Joint Research] University of Colorado at Boulder/University of Maryland, College Park/The Arizona State University(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: University of Colorado at Boulder/University of Maryland, College Park/The Arizona State University
  • # of Other Institutions: 1
• [Int'l Joint Research] University of Alberta(Canada)
  • Country Name: Canada
  • Counterpart Institution: University of Alberta
• [Int'l Joint Research] University of Leicester/The University of Manchester(英国)
  • Country Name: UNITED KINGDOM
  • Counterpart Institution: University of Leicester/The University of Manchester
• [Int'l Joint Research] Chinese Academy of Geological Science/Northwest University(China)
  • Country Name: China
  • Counterpart Institution: Chinese Academy of Geological Science/Northwest University
• [Int'l Joint Research]
  • # of Other Countries: 4
• [Journal Article] A prolonged granitoid formation in Saglek Block, Labrador: Zonal growth and crustal reworking of continental crust in the Eoarchean (2017)
  • Author(s): Komiya, T., Yamamoto, S., Aoki, S., Koshida, K., Shimojo, M., Sawaki, Y., Aoki, K., Sakata, S., Yokoyama, T.D., Maki, K., Ishikawa, A., Hirata, T., Collerson, K.D.
  • Journal Title: Geoscience Frontiers Volume: 8 Pages: 355-385
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Investigating the influence of nonspectral matrix effects for determination of 22 trace elements in rock samples by ICP-QMS (2017)
  • Author(s): Yokoyama, T., Nagai, Y., Hinohara, Y. & Mori, T.
  • Journal Title: Geostandards and Geoanalytical Research Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] Chemical evolution of 244Pu in the solar vicinity and its implication for the properties of r-process production (2017)
  • Author(s): Tsujimoto, T., Yokoyama, T. & Bekki, K.
  • Journal Title: The Astrophysical Journal Letters Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] New Constraints on the Shergottite Petrogenesis by Analysis of Pb Isotopic Compositional Space: Implication for Mantle Heterogeneity and Crustal Assimilation on Mars (2017)
  • Author(s): Tobita, M., Usui, T. & Yokoyama, T.
  • Journal Title: Geochemical Journal Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] Fluid-fluxed melting of mantle vs. decompression melting of hydrous mantle plume as the cause of intraplate magmatism over a stagnant slab: implications from Fukue Volcano Group, SW Japan (2017)
  • Author(s): Kuritani, T., Sakuyama, T., Kamada, N., Yokoyama, T. & Nakagawa, M.
  • Journal Title: Lithos Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] Stable isotope fractionation of tungsten during adsorption on Fe and Mn (oxyhydr)oxides (2017)
  • Author(s): Kashiwabara, T., Kubo, S., Tanaka, M., Senda, R., Iizuka, T., Tanimizu, M. & Takahashi, Y.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 204 Pages: 52-67
  • Peer Reviewed
• [Journal Article] What Hf isotopes in zircon tell us about crust-mantle evolution (2017)
  • Author(s): Iizuka, T., Yamaguchi, T., Itano, K., Hibiya, Y. & Suzuki, K.
  • Journal Title: Lithos Volume: 274-275 Pages: 394-327
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Tellurium isotope compositions in acid leach fractions of carbonaceous chondrites (2017)
  • Author(s): Fukami, Y. & Yokoyama, T.
  • Journal Title: Geochemical Journal Volume: 51 Pages: 17-29
  • Peer Reviewed
• [Journal Article] Precise Isotope Analysis for Sub-nanogram Lead by Total Evaporation Thermal Ionization Mass Spectrometry (TE-TIMS) coupled with 204Pb-207Pb Double Spike method (2017)
  • Author(s): Fukami, Y., Tobita, M., Yokoyama, T., Moriwaki, R. & Usui, T.
  • Journal Title: Journal of Analytical Atomic Spectrometry Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] Evaluation of long-term fluctuation in isotope ratios measured by TIMS with static, dynamic, and multistatic methods: A case study for Nd isotope measurements (2017)
  • Author(s): Fukai, R., Yokoyama, T. & Kagami., S.
  • Journal Title: International Journal of Mass Spectrometry Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evolution of rheological structure of Mars (2017)
  • Author(s): Azuma, S. & Katayama, I.
  • Journal Title: Earth, Planet and Space Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed
• [Journal Article] Influence of contamination on banded iron formations in the Isua supracrustal belt, West Greenland: Reevaluation of the Eoarchean seawater compositions (2017)
  • Author(s): Aoki, S., Morinaga, C., Kato, Y., Hirata, T. & Komiya, T.
  • Journal Title: Geoscience Frontiers Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Nucleosynthetic isotope variation of siderophile and chalcophile elements in the Solar System (2016)
  • Author(s): Yokoyama, T. & Walker, R.J.
  • Journal Title: Reviews in Mineralogy and Geochemistry Volume: 81 Pages: 107-160
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Occurrence and geochronology of the Eoarchean, ~3.9 Ga, Iqaluk Gneiss in the Saglek Block, northern Labrador, Canada: Evidence for the oldest supracrustal rocks in the world (2016)
  • Author(s): Shimojo, M., Yamamoto, S., Sakata, S., Yokoyama, T.D., Maki, K., Sawaki, Y., Ishikawa, A., Aoki, K., Aoki, S., Koshida, K., Tashiro, T., Hirata, T., Collerson, K.D. & Komiya, T.
  • Journal Title: Precambrian Research Volume: 278 Pages: 218-243
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] PIXE and microthermometric analyses of fluid inclusions in hydrothermal quartz from the 2.2 Ga Ongeluk Formation, South Africa: Implications for ancient seawater salinity (2016)
  • Author(s): Saito, T., Shibuya, T., Komiya, T., Kitajima, K., Yamamoto, S., Nishizawa, M., Ueno, Y., Kurosawa, M. & Maruyama, S.
  • Journal Title: Precambrian Research Volume: 286 Pages: 337-351
  • Peer Reviewed
• [Journal Article] Recognizing OIB and MORB in accretionary complexes: A new approach based on ocean plate stratigraphy, petrology and geochemistry (2016)
  • Author(s): Safonova, I., Maruyama, S., Kojima, S., Komiya, T., Krivonogov, S. & Koshida, K.
  • Journal Title: Gondwana Research Volume: 33 Pages: 92-114
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Molybdenum isotope analysis by negative thermal ionization mass spectrometry (N-TIMS): Effects of oxygen isotopic compositions (2016)
  • Author(s): Nagai, Y. & Yokoyama, T.
  • Journal Title: Journal of Analytical Atomic Spectrometry Volume: 31 Pages: 948-960
  • Peer Reviewed
• [Journal Article] Intensive hydration of the wedge mantle at the Kuril arc-NE Japan arc junction: implications from mafic lavas from Usu Volcano, northern Japan (2016)
  • Author(s): Kuritani, T., Tanaka, M., Yokoyama, T., Nakagawa, M. & Matsumoto, A.
  • Journal Title: Journal of Petrology Volume: 57 Pages: 1223-1240
  • Peer Reviewed
• [Journal Article] Very low isotope ratio of iron in fine aerosols related to its contribution to the surface ocean (2016)
  • Author(s): Kurisu, M., Takahashi, Y., Iizuka, T. & Uematsu, M.
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 121 Pages: 11,119-11,136
  • Peer Reviewed
• [Journal Article] Petrology and geochemistry of mafic rocks in the Acasta Gneiss Complex: Implications for the oldest mafic rocks and their origin (2016)
  • Author(s): Koshida, K., Ishikawa, A., Iwamori, H. & Komiya, T.
  • Journal Title: Precambrian Research Volume: 283 Pages: 190-207
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] U-Pb and Al-Mg systematics of the ungrouped achondrite Northwest Africa 7325 (2016)
  • Author(s): Koefoed, P., Amelin, Y., Yin, Q.-Z., Wimpenny, J., Sanborn, M.E., Iizuka, T. & Irving, A.J.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 183 Pages: 31-45
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Chemical separation of Nd from geological samples for chronological studies using 146Sm-142Nd and 147Sm-143Nd systematics (2016)
  • Author(s): Kagami, S. & Yokoyama, T.
  • Journal Title: Analytica Chimica Acta Volume: 937 Pages: 151-159
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] U-Pb chronology and geochemistry of detrital monazites from major African rivers: Constraints on the timing and nature of the Pan-African Orogeny (2016)
  • Author(s): Itano, K., Iizuka, T., Chang, Q., Kimura, J.-I. & Maruyama, S.
  • Journal Title: Precambrian Research Volume: 282 Pages: 139-156
  • Peer Reviewed
• [Journal Article] The initial abundance and distribution of 92Nb in the Solar System (2016)
  • Author(s): Iizuka, T., Lai, Y.-J., Akram, W., Amelin, Y. & Schonbachler, M.
  • Journal Title: Earth and Planetary Science Letters Volume: 439 Pages: 172-182
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Frictional properties of clay minerals and implication to subduction zone seismicity (2016)
  • Author(s): Katayama, I.
  • Organizer: Gordon Research Conference, Rock Deformation
  • Place of Presentation: Andover, USA
  • Year and Date: 2016-08-22 – 2016-08-22
  • Int'l Joint Research / Invited
• [Presentation] Nucleosynthetic Yb isotope anomalies in meteorites (2016)
  • Author(s): Yokoyama, T., Nakahara, M. & Fukai, R.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Shock-metamorphosed zircons discovered in Jack Hills metaconglomerate from the Narryer Gneiss Complex, Western Australia (2016)
  • Author(s): Yamamoto, S., Komiya, T., Iizuka, T., Shibuya, T. & Collerson, K.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] The related Granitic intrusion events of an outcrop in Dongshan area, Anshan of the North China Craton (2016)
  • Author(s): Uehara, H., Yamamoto, S., Kon, Y., Li, Y., Jin, W. & Komiya, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Origin and evolution of r-process nuclides in Local Universe (2016)
  • Author(s): Tsujimoto, T. & Yokoyama, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Development of precise isotope analysis for small amount of Pb using 204Pb-207Pb double spike TIMS (2016)
  • Author(s): Tobita, M., Fukami, Y., Yokoyama, T., Usui, T., R., M. & Asanuma, H.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Hf-O isotope signature for zircons in the Taitao Granite: geochemical constraints on slab-melting (2016)
  • Author(s): Suzuki, K., Iizuka, T., Kitajima, K., Valley, J.W., Sawaki, Y., Hattori, K., Hirata, T. & Anma, R.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] U-Pb and Lu-Hf isotopic study of detrital zircons from the Paleoproterozoic Murmac Bay Group in the Rae craton (2016)
  • Author(s): Sawada, H., Isozaki, Y., Tsutsumi, Y. & Iizuka, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Ancient seawater salinity retained as fluid inclusions in hydrothermal quartz from the 2.2 Ga Ongeluk Formation, South Africa (2016)
  • Author(s): Saito, T., Shibuya, T., Komiya, T., Nishizawa, M., Maruyama, S. & Kurosawa, M.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] In situ analysis of Os isotopes and highly siderophile element concentrations in metal grains from CB chondrites (2016)
  • Author(s): Nakanishi, N., Yokoyama, T., Usui, T. & Iwamori, H.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Mo isotope evidence for distinct isotope reservoirs in the early Solar System (2016)
  • Author(s): Nagai, Y. & Yokoyama, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Uranium-thorium-lead isotope systematics in depleted shergottites: Implications for the heterogeneous shergottite source mantle (2016)
  • Author(s): Moriwaki, R., Usui, T. & Yokoyama, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Chromite: Accessory tracers of pallasite parent body differentiation (2016)
  • Author(s): McKibbin, S., Hecht, L., Iizuka, T. & Claeys, P.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Detection of remarkably low isotopic ratio of iron in anthropogenic aerosols and investigation of their sources (2016)
  • Author(s): Kurisu, M., Sakara, K., Iizuka, T. & Takahashi, Y.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Re-Os constraints on the formation age of Acasta mafic rocks (2016)
  • Author(s): Koshida, K., Ishikawa, A., Suzuki, K. & Komiya, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] The Nulliak supracrustal rocks, Labrador, Canada: Their occurrence, age, and the oldest evidence for life (2016)
  • Author(s): Komiya, T., Aoki, S., Koshiba, K., Tashiro, T., Yamamoto, S., Ishikawa, A., Ishida, A., Hori, M., Igisu, M. & Sano, Y.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Halogen and noble gas systematics within mantle xenoliths from intraplate settings (2016)
  • Author(s): Kobayashi, M., Sumino, H., Burgess, R., Iizuka, T., Nagao, J., Nakamura, M., Takahashi, E. & Ballentine, C.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] 146Sm-142Nd whole-rock isochron age of basaltic eucrites (2016)
  • Author(s): Kagami, S., Yokoyama, T. & Usui, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Accurate LA-ICP-MS determination of HREE abundances in monazite (2016)
  • Author(s): Itano, K., Iizuka, T. & Hoshino, M.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] U-Pb systematics of eucrites: A record of the thermal history (2016)
  • Author(s): Iizuka, T., Yamaguchi, A., Koefoed, P., Hibiya, Y. & Amelin, Y.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Constraints on the origin of primitive achondrites from NWA 6704 (2016)
  • Author(s): Hibiya, Y., Iizuka, T., Ozawa, K. & Yamaguchi, A.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Nucleosynthetic neodymium isotope anomalies in bulk chondrites (2016)
  • Author(s): Fukai, R. & Yokoyama, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Origins of transition elements of the BIFs: Implications for the Archean Seawater chemistry (2016)
  • Author(s): Aoki, S., Sakata, S., Kato, Y., Hirata, T. & Komiya, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Fractionation of radiogenic Pb isotopes induced by acid leaching: a pervasive phenomenon in Pb-isotopic dating of meteorites (2016)
  • Author(s): Amelin, Y., Yin, Q.-Z., Koefoed, P., Merle, R., Huyskens, M.H. & Iizuka, T.
  • Organizer: The 26th V.M. Goldschmidt Conference
  • Place of Presentation: Pacifico Yokohama (Yokohama, Kanagawa Prefecture, JAPAN)
  • Year and Date: 2016-06-26 – 2016-07-01
  • Int'l Joint Research
• [Presentation] Rheological behavior of glaucophane and lawsonite in experimentally deformed blueschists (2016)
  • Author(s): Kim, D., Katayama, I., Wallis, S., Michibayashi, K., Miyake, A., Seto, Y. & Azuma, S.
  • Organizer: European Geophysical Union General Assembly 2016
  • Place of Presentation: Viena, Austria
  • Year and Date: 2016-04-19 – 2016-04-19
  • Int'l Joint Research
• [Remarks] 小宮研究室 地球生命環境進化史
  • URL: http://www43.tok2.com/home/isua/