Reexamination of the genesis of adakitic magma: with special reference to the significance of metamorphosed layered gabbros

• Project/Area Number: 18K03790
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: National Institute of Polar Research
• Principal Investigator: Motoyoshi Yoichi 国立極地研究所, その他部局等, 名誉教授 (90211606)
• Co-Investigator(Kenkyū-buntansha): 廣井 美邦 国立極地研究所, 研究教育系, 外来研究員 (40019427) ; 白石 和行 国立極地研究所, その他部局等, 特別客員研究員 (90132711) ; 川嵜 智佑 愛媛大学, 理学部, 研究員 (50136363) ; 土谷 信高 株式会社蒜山地質年代学研究所(地質技術センター), 地質技術センター, 研究員 (50192646)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: アダカイト / 海洋地殻 / 層状斑れい岩 / 高圧変成作用 / 大陸地殻 / 三波川変成帯 / 高温高圧実験 / アダカイト質マグマ / 大陸地殻形成 / 日の出岬 / 南極

Outline of Final Research Achievements

Based on the idea that the formation process of the continental crust on the early stage of Earth was closely related to the genesis of adakitic magma, we investigated the detailed petrological and mineralogical studies on metamorphosed layered gabbro from the Sambagawa metamorphic belt, which are supposed to be the main components of the oceanic crust. Chemical analysis of whole rock and minerals including rare earth elements was conducted, and the origin of adakitic magma was investigated by integrating the results of high-temperature and high-pressure experiments using a metamorphosed layered gabbro as the starting material. As a result, we confirmed that adakitic magma can be formed not only by the conventionally proposed MORB melting, but also by partial melting of layered gabbros beneath it along the subduction in the mantle.

Academic Significance and Societal Importance of the Research Achievements

本研究の目的は、アダカイト質マグマの成因として従来有力であったMORBの部分溶融に加え、海洋地殻の主要部分である層状斑れい岩の部分溶融が主要な要因ではないかとの発想から、その可能性を記載岩石学的、鉱物学的、実験岩石学的に検証することにあった。そのために、典型的な層状はんれい岩である四国三波川帯の藍晶石-ゾイサイト岩を海溝の奥部で変成した海洋地殻の一部とみなし、それを高温高圧実験によって部分溶融させ、生成したメルトと溶け残り物質を詳 細に記載するとともに、微量元素を含む化学分析から部分溶融過程ならびにその生成物の科学的特徴、多様性を明らかにすることであった。

Research Products

• [Int'l Joint Research] Peradenya University/Geological Survey Department(スリランカ)
• [Journal Article] Counter-clockwise <i>P-T</i> history deduced from kyanite-bearing pelitic gneiss in Tenmondai Rock, Lützow-Holm Complex, East Antarctica (2023)
  • Author(s): Baba, S., Nantasin, P., Kamei, A., Kitano, I., Motoyoshi, Y., Setiawan, N.I., Dashbaatar, D., Hokada, T.
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 118 Issue: ANTARCTICA Pages: n/a
  • DOI: 10.2465/jmps.221202
  • ISSN: 1345-6296, 1349-3825
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multiple metasomatism in large-ion lithosphile element-rich mafic granulite from Austhovde, Lutzow-Holm Complex, East Antarctica (2023)
  • Author(s): Hiroi, Y., Hokada, T., Adachi, T., Kamei, A., Shiraishi, K., Motoyoshi, Y.
  • Journal Title: Journal of Mineralogical and Petrological Sciences (accepted for publication) Volume: -
  • Peer Reviewed / Open Access
• [Journal Article] Nanogranitoid inclusions with grandidierite in mafic granulite from Austhovde, Lützow-Holm Complex, East Antarctica (2023)
  • Author(s): Hiroi Yoshikuni、Hokada Tomokazu、Adachi Tatsuro、Shiraishi Kazuyuki、Motoyoshi Yoichi、Grew Edward S.
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 118 Issue: ANTARCTICA Pages: n/a
  • DOI: 10.2465/jmps.221209
  • ISSN: 1345-6296, 1349-3825
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Zoned quartz phenocrysts in supercooled melt inclusions in granulites from continental collision orogens (2020)
  • Author(s): 27.Yoshikuni Hiroi, Tomokazu Hokada, Masahiro Kayama, Akira Miyake, Tatsuro Adachi, Bernard Prame, Keerthi Perera, Madhusoodhan Satish-Kumar, Yasuhito Osanai, Yoichi Motoyoshi, David J. Ellis, Kazuyuki Shiraishi
  • Journal Title: Island Arc Volume: 29 Issue: 1 Pages: 1-16
  • DOI: 10.1111/iar.12374
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Geological subdivision of the Lutzow-Holm Complex in East Antarctica: From the Neoarchean to the Neoproterozoic (2020)
  • Author(s): Dunkley Daniel J.、Hokada Tomokazu、Shiraishi Kazuyuki、Hiroi Yoshikuni、Nogi Yoshifumi、Motoyoshi Yoichi
  • Journal Title: Polar Science Volume: 26 Pages: 100606-100606
  • DOI: 10.1016/j.polar.2020.100606
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Tectono-metamorphic evolution and significance of shear-zone lithologies in Akebono Rock, Lutzow-Holm Complex, East Antarctica (2020)
  • Author(s): Baba Sotaro、Hokada Tomokazu、Kamei Atsushi、Kitano Ippei、Motoyoshi Yoichi、Nantasin Prayath、Setiawan Nugroho Imam、Dashbaatar Davaa-Ochir
  • Journal Title: Antarctic Science Volume: 33 Issue: 1 Pages: 52-72
  • DOI: 10.1017/s0954102020000450
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] FeAlO₃ under ultrahigh–temperature metamorphic conditions: Experimental evidence from the sillimanite–Fe₂O₃ and sillimanite–Fe₃O₄ systems (2019)
  • Author(s): Kawasaki, T., Adachi, T., Ofuji, H., Osanai, Y.
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 114 Issue: 5 Pages: 238-251
  • DOI: 10.2465/jmps.190509
  • NAID: 130007757384
  • ISSN: 1345-6296, 1349-3825
  • Peer Reviewed / Open Access
• [Journal Article] Felsite-nanogranite inclusions and three Al2SiO5 polymorphs in the same garnet in ultrahigh-temperature granulates from Rundvagshetta, Lutzow-Holm Complex, East Antarctica (2019)
  • Author(s): Yoshikuni Hiroi, Tomokazu Hokada, Mutsumi Kato, Ayahiko Yanagi, Tatsuro Adachi, Yasuhito Osanai, Yoichi Motoyoshi, Kazuyuki Shiraishi
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 114 Pages: 60-78
  • Peer Reviewed / Open Access
• [Presentation] 変形に起因する藍晶石から紅柱石への相転移：ボヘミア地塊南部Gfohlグラニュライトの例 (2022)
  • Author(s): 吉岡 拓郎、金川 久一、廣井 美邦、平島 崇男、スフォイッカ マルティン、外田 智千、本吉 洋一、ウォリス サイモン、永冶 方敬
  • Organizer: Japan Geoscience Union Meeting 2022
  • Int'l Joint Research
• [Presentation] Infiltration of K-Cl-rich fluid in mafic granulite from Austhovde (2022)
  • Author(s): Hiroi Yoshikuni, Hokada Tomokazu, Adachi Tatsuro, Kamei Atsushi, Shiraishi Kazuyuki, Motoyoshi Yoichi
  • Organizer: The 13th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] U-Pb zircon geochronology of high-grade metamorphic rocks from outcrops along the Prince Olav Coast, East Antarctica (2021)
  • Author(s): Ippei Kitano, Tomokazu Hokada, Sotaro Baba, Atsushi Kamei, Yoichi Motoyoshi, Tsuyoshi Toyoshima, Masahiro Ishikawa, Takuma Katori, Nobuhiko Nakano, Yasuhito Osanai
  • Organizer: The 12th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Cordierite megacrysts in felsic gneiss from Botunnuten in southern Lutzow-Holm Complex, East Antarctica (2020)
  • Author(s): Baba. S., Oshiro, S., Hokada, T., Kamei, A., Kitano, I. and Motoyoshi, Y.
  • Organizer: The 11th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Geologic nature and evolution of Western Rayner Complex, with reference to Point Windows charnockite and its localized hydration process (2020)
  • Author(s): Hokada, T., Baba, S., Kamei, A., Kitano, I. and Motoyoshi, Y.
  • Organizer: The 11th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] The petrographu of staurolite-bearing garnet-gedrite-biotite-chlorite gneiss from the northeastern part of Akebono Rock in the Lutzow-Holm Complex, East Antarctica (2020)
  • Author(s): Kitano, I., Hokada, T., Baba, S., Kamei, A. and Motoyoshi, Y.
  • Organizer: The 11th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Geochemical study on charnockite in Rundvagshetta, Lutzow-Holm complex (2020)
  • Author(s): Kamei, A., Awata, H., Hokada, T., Baba, S., Kitano, I. and Motoyoshi, Y.
  • Organizer: The 11th Symposium on Polar Science
• [Presentation] Letters from Deep Crust - What we received from Antarctica and Gondwana (2019)
  • Author(s): Motoyoshi, Y.
  • Organizer: XIII International Symposium on Antarctic Earth Sciences
  • Int'l Joint Research / Invited
• [Presentation] Metamorphic P-T path of West Ongul Island, Lutzow-Holm Complex, East Antarctica inferred from inclusions within magnetite - ilmenite megacryst in microcline pegmatite dyke. (2019)
  • Author(s): Kawasaki, T., Adachi, T., Nakano, N., Osanai, Y.
  • Organizer: 2019 IAGR Annual Convention & 16th International Conference on Gondwana to Asia.
  • Int'l Joint Research
• [Presentation] Adakitic granodiorite derived from normal thickened crust inactive continental margin, Shikanoshima Island, Kyushu, southwest Japan. (2019)
  • Author(s): Owada, M., Kawasaki, T., Kamei, A.
  • Organizer: 2019 IAGR Annual Convention & 16th International Conference on Gondwana to Asia.
  • Int'l Joint Research
• [Presentation] Geologic connection between Drowning Maud Land and Enderby Land (2019)
  • Author(s): Hokada, T., Horie, K., Baba, S., Kamei, A., Kitano, I., Motoyoshi, Y., Hiroi, Y., Takehara, M., Shiraishi, K.
  • Organizer: The 10th Symposium on Polar Science
  • Int'l Joint Research
• [Presentation] Geology of the eastern Drowning Maud Land, East Antarctica: Missing link to Sri Lanka (2019)
  • Author(s): Shiraishi, K., Hokada, T., Hiroi, Y., Nogi, Y., Motoyoshi, Y.
  • Organizer: The 10th Symposium on Polar Science
• [Presentation] 東南極プリンスオラフ海岸に分布する泥質片麻岩の変成条件 (2019)
  • Author(s): 馬場壮太郎、外田智千、亀井淳志、北野一平、本吉洋一
  • Organizer: 日本地質学会第126年学術大会
• [Presentation] スリランカ・ハイランド岩体に産する高温変成岩中のザクロ石・ジルコン希土類元素組成 (2019)
  • Author(s): 東野文子・廣井美邦・本吉洋一・石川正弘・小林記之・本多聡子・プレーム・バーナード・青木一勝・青木翔吾
  • Organizer: 日本地質学会第126年学術大会
• [Presentation] 東南極ドロンイングモードランド東部の地質：スリランカとのリンク (2019)
  • Author(s): 白石和行、外田智千、廣井美邦、野木義史、本吉洋一
  • Organizer: 日本鉱物科学会2019年会
• [Presentation] 花崗岩岩石学から見た日本列島大陸地殻成長史 (2018)
  • Author(s): 土谷信高
  • Organizer: 日本地質学会第125年学術総会
  • Invited
• [Presentation] Evidence of partial melting and melt extraction in mafic granulates (2018)
  • Author(s): Yoshikuni Hiroi, Tomokazu Hokada, Kazuyuki Shiraishi, Yoichi Motoyoshi, Edward S. Grew
  • Organizer: 第9回極域科学シンポジウム