Geochemical study for fluid liberated from amphibolite-facies slaband magma genesis in the initial stage of subduction

2008 Fiscal Year Self-evaluation 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

沈み込み帯におけるマグマの生産が, 大陸地殻の形成・成長・進化に対して大きな役割を果たしていることは, 様々な研究によって広く支持されている。しかし一方で, 新たなプレートの沈み込みがいかにして始まり, どのような過程でどのような化学組成のマグマが生じ, それが時間と共にどう変化するのか, ということについては, 未だ断片的な情報しか得られていない。
本研究では, オマーンオフィオライトおよび伊豆小笠原弧の火山岩・変成岩について岩石学的・地球化学的研究を行うことにより, 沈み込み帯形成最初期における, 沈み込む海洋リソスフェア(スラブ)からマントルへの物質移動とそれに伴うマグマ形成過程を明らかにする。

Research Products

• [Journal Article] A simple method for the precisedetermination of boron, zirconium, niobium, hafnium and tantalum usingICP-MS and new results for rockreference samples (2009)
  • Author(s): Nagaishi, K. and Ishikawa, T
  • Journal Title: Geochemical Journal vol.43 Pages: 133-141
  • Peer Reviewed
• [Journal Article] The IODP Expedition 307Scientists(2007)Age constraints on the origin and growth history of adeep-water coral mound in NE Atlanticdrilled 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., Browning, E.-L., Li, X.
  • Journal Title: Geology vol.35 Pages: 1051-1054
  • Peer Reviewed
• [Journal Article] Development of rapid and precise Pbisotope analytical techniques usingMC-ICP-MS and new results for GSJrock reference samples. (2006)
  • Author(s): Tanimizu, M., and Ishikawa, T.
  • Journal Title: Geochemical Journal vol.40 Pages: 121-133
  • Peer Reviewed
• [Presentation] Boron contents ofthe altered oceanic crust from theOman ophiolite (2008)
  • Author(s): Yamaoka, K., Kawahata, H., Nagaishi, K., and Ishikawa, T.
  • Organizer: EGU General Assembly
  • Place of Presentation: Vienna, Austria A0033
  • Year and Date: 2008-04-18
• [Presentation] Amphibolite-faciesmetamorphism of the subducted slaband boninite magma genesis metamorphism of the subducted slab and boninite magma genesis : Aninference from the Oman ophiolite (2007)
  • Author(s): Ishikawa, T., Nagaishi, K, and Fujisama S.
  • Organizer: 17th V. M. Goldschmidt Conference
  • Place of Presentation: Cologne, Germany
  • Year and Date: 2007-08-23
• [Presentation] Origin of boniniticvolcanism in the Oman ophiolite (2006)
  • Author(s): Ishikawa, T.
  • Organizer: Symposium on the Oman Ophiolite and Oceanic Crust, Ministry of Commerceand Industry
  • Place of Presentation: Muscat, Sultanate of Oman
  • Year and Date: 2006-12-19