Platinum-group element behavior during partial melting of mantle and a reevaluation of primitive upper mantle estimates

2010 Fiscal Year Final Research Report

• Project/Area Number: 21840068
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: The University of Tokyo (2010); Japan Agency for Marine-Earth Science and Technology (2009)
• Principal Investigator: ISHIKAWA Akira 東京大学, 大学院・総合文化研究科, 助教 (20524507)
• Research Collaborator: SUZUKI Katsuhiko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 主任研究員 (70251329) ; SENDA Ryoko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 技術研究副主任 (50377991) ; MARUOKA Teruyuki 筑波大学, 大学院・生命環境科学研究科, 准教授 (80400646) ; D. GRAHAM Pearson イギリス、ダラム大学, 教授 ; D. GRAHAM Pearson カナダ、アルバータ大学, 教授
• Project Period (FY): 2009 – 2010
• Keywords: 地殻・マントル物質 / 白金族元素 / オスミウム同位体 / かんらん岩

Research Abstract

With the aim of constraining the origin of the Earth's mantle, a renewed analytical protocol has been established for obtaining accurate 1870s/1880s ratios and platinum-group element concentrations for peridotite samples, and it has been applied for abyssal peridotites recovered from East Pacific Rise. The results demonstrate that the platinum-group elements in abyssal peridotites can provide direct information of source mantle and its compositional heterogeneity because of their low mobilities during mantle melting and subsequent alteration in mid-ocean ridge environments.

Research Products

• [Journal Article] インドネシア非火山性外弧のオフィオライト-世界最若オフィオライトの産状と岩石学的多様性 (2011)
  • Author(s): 石川晃, 金子慶之, 太田努, 磯崎行雄
  • Journal Title: 地学雑誌 Volume: 120 Pages: 52-64
  • Peer Reviewed
• [Journal Article] Ancient Os isotope signatures from the Ontong Java Plateau lithosphere : tracing lithospheric accretion history (2011)
  • Author(s): Ishikawa, A., Pearson, D. G., Dale, C. W.
  • Journal Title: Earth and Planetary Science Letters Volume: 301 Pages: 159-170
  • Peer Reviewed
• [Journal Article] Age, composition and thermal characteristics of South African off-craton mantle lithosphere : evidence for a multi-stage history (2010)
  • Author(s): Janney, P. E., Shirey, S. B., Carlson, R. W., Pearson, D. G., Bell, D. R., Le Roex, A. P., Ishikawa, A., Nixon, P. H., Boyd, F. R.
  • Journal Title: Journal of Petrology Volume: 51 Pages: 1849-1890
  • Peer Reviewed
• [Presentation] Trans-lithospheric variations in highly siderophile elements beneath the Ontong Java Plateau. (2011)
  • Author(s): Ishikawa, A., Maruoka, T., Pearson, D. G., Dale, C. W.
  • Organizer: The 21st V. M. Goldschmidt Conference
  • Place of Presentation: チェコ・プラハ
  • Year and Date: 2011-08-17
• [Presentation] Highly siderophile element geochemistry of high-Mg basalts from Pacific large igneous provinces (2011)
  • Author(s): Ishikawa, A., Sano, T., Senda, R., Chang, Q., Suzuki, K.
  • Organizer: Japan Geoscience Union International Symposium 2011
  • Place of Presentation: 日本・幕張メッセ
  • Year and Date: 2011-05-27
• [Presentation] Chemical properties of cratonic roots and their modern analogues : implications for the generation of cratons and their formation. (2011)
  • Author(s): Pearson, D. G., Ishikawa, A., Zhao, Z., Mather, K., Kjarsgaard, B.
  • Organizer: International Conference on Craton Formation and Destruction 2011
  • Place of Presentation: 中国・北京
  • Year and Date: 2011-04-28
• [Presentation] Lithosphere formation beneath the Ontong Java Plateau : An example of plume underplating and its relation to craton formation (2011)
  • Author(s): Ishikawa, A., Pearson, D. G., Dale, C. W.
  • Organizer: International Conference on Craton Formation and Destruction 2011
  • Place of Presentation: 中国・北京
  • Year and Date: 2011-04-26
• [Presentation] Re-Os isotopes and platinum-group elements in a peridotite-pyroxenite hybrid mantle (2009)
  • Author(s): Ishikawa, A., Pearson, D. G., Dale, C. W.
  • Organizer: The 19th V. M. Goldschmidt conference 2009
  • Place of Presentation: スイス・ダボス
  • Year and Date: 2009-06-25
• [Presentation] Platinum-group elements in the oceanic mantle beneath the Ontong Java Plateau (2009)
  • Author(s): Ishikawa, A., Pearson, D. G., Dale, C. W.
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 日本・幕張メッセ
  • Year and Date: 2009-05-19