Mass transfer from amphibolite-facies slab to the mantle and magma genesis in the initial stage of subduction

2009 Fiscal Year Final Research Report

• Project/Area Number: 18340171
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: ISHIKAWA Tsuyoshi Japan Agency for Marine-Earth Science and Technology, 高知コア研究所, グループリーダー (30270979)
• Project Period (FY): 2006 – 2009
• Keywords: オマーンオフィオライト / 島弧 / 火山岩 / ボニナイト / 微量元素 / 同位体 / マグマ / 流体

Research Abstract

Field survey and chemical analysis were carried out for the Oman ophiolite, a large fragment of 100 million year-old oceanic lithosphere. The field survey revealed widespread occurrence of boninite which represents the volcanic rock formed in subduction zone with extremely hot thermal structure. The chemical analysis showed that hydrous fluids liberated from subducted, amphibolite-facies oceanic crust (500～700℃) were widely incorporated in magma genesis in the initial stage of subduction.

Research Products

• [Journal Article] A simple method for the precise determination of boron, zirconium, niobium, hafnium and tantalum using ICP-MS and new results for rock reference samples. (2009)
  • Author(s): Nagaishi, K., Ishikawa, T.
  • Journal Title: Geochemical Journal 43 Pages: 133-141
  • Peer Reviewed
• [Journal Article] Browning, E.-L., Li, X., and The IODP Expedition 307 Scientists, Age constraints on the origin and growth history of a deep-water coral mound in NE Atlantic drilled in IODP Expedition 307. (2007)
  • Author(s): Kano, A., Ferdelman, T.G., Williams, T., Henriet, J.-P., Ishikawa, T., Kawagoe, N., Takashima, C., Kakizaki, Y., Abe, K., Sakai, S.
  • Journal Title: Geology 35 Pages: 1051-1054
  • Peer Reviewed
• [Journal Article] Amphibolite-facies metamorphism of the subducted slab and boninite magma genesis: An inference from the Oman ophiolite. (2007)
  • Author(s): Ishikawa, T., Nagaishi, K, Fujisama S.
  • Journal Title: Geochimica et Cosmochimica Acta 71 Pages: 1-A431
• [Journal Article] Development of rapid and precise Pb isotope analytical techniques using MC-ICP-MS and new results for GSJ rock reference samples. (2006)
  • Author(s): Tanimizu M., Ishikawa, T.
  • Journal Title: Geochemical Jounal 40 Pages: 121-133
  • Peer Reviewed
• [Journal Article] 北大東島の地表に分布するドロマイトのSr同位体組成
  • Author(s): 高柳栄子・中山裕樹・石川剛志・永石一弥・井龍康文
  • Journal Title: 地質学雑誌 (印刷中)
  • Peer Reviewed
• [Presentation] オマーンオフィオライトにおける海洋地殻岩のホウ素濃度および同位体組成 (2010)
  • Author(s): 山岡香子・石川剛志・永石一弥・川幡穂高
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張
  • Year and Date: 2010-05-27
• [Presentation] 北部伊豆弧火山岩の微量元素・同位体組成から見たスラブ脱水・流体移動と元素分別 (2009)
  • Author(s): 石川剛志
  • Organizer: 2009年度日本地球化学会年会
  • Place of Presentation: 広島
  • Year and Date: 2009-09-17
• [Presentation] Boron contents of the altered oceanic crust from the Oman ophiolite. (2008)
  • Author(s): Yamaoka, K., Kawahata, H., Nagaishi, K., Ishikawa, T.
  • Organizer: EGU General Assembly
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2008-04-18
• [Presentation] 神津島面房火山の玄武岩質包有物に見られる顕著な負のCe異常 (2007)
  • Author(s): 石川剛志・吉田忍
  • Organizer: 日本地球化学会第54回年会
  • Place of Presentation: 岡山
  • Year and Date: 2007-09-20
• [Presentation] ICP-MSを用いた標準岩石試料中のBおよびZr, Nb, Hf, Taの分析 (2007)
  • Author(s): 永石一弥・石川剛志・谷水雅治
  • Organizer: 日本地球化学会第54回年会
  • Place of Presentation: 岡山
  • Year and Date: 2007-09-20
• [Presentation] Amphibolite-facies metamorphism of the subducted slab and boninite magma genesis: An inference from the Oman ophiolite. (2007)
  • Author(s): Ishikawa, T., Nagaishi, K, Fujisama S.
  • Organizer: 17th V.M. Goldschmidt Conference
  • Place of Presentation: Cologne, Germany
  • Year and Date: 2007-08-23
• [Presentation] Origin of boninitic volcanism in the Oman ophiolite. (2006)
  • Author(s): Ishikawa, T.
  • Organizer: Symposium on the Oman Ophiolite and Oceanic Crust, Ministry of Commerce and Industry
  • Place of Presentation: Sultanate of Oman, Muscat
  • Year and Date: 2006-12-19
• [Presentation] 沈み込み帯形成最初期における角閃岩相スラブの脱水とボニナイトマグマ形成 (2006)
  • Author(s): 石川剛志, 永石一弥
  • Organizer: 日本火山学会2006年度秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2006-10-24
• [Remarks] 永石一弥,Fluid transfer and magmatism in the initial stage of subduction: Inference from the Oman ophiolite(沈み込み帯形成最初期の流体移動とマグマ形成過程:オマーンオフィオライトからの推定).博士論文,静岡大学大学院理工学研究科環境科学専攻,2009年3月
• [Remarks] 山岡香子, Study on hydrothermal alteration of oceanic crust in the Oman ophiolite based on isotope geochemistry(同位体地球化学に基づくオマーンオフィオライト海洋地殻の熱水変質).博士論文,東京大学大学院新領域創生科学研究科自然環境学専攻,2010年3月