Osmium model age distribution of the Pacific mantle

2015 Fiscal Year Final Research Report

• Project/Area Number: 25870162
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry; Petrology/Mineralogy/Economic geology
• Research Institution: The University of Tokyo
• Principal Investigator: ISHIKAWA Akira 東京大学, 総合文化研究科, 助教 (20524507)
• Research Collaborator: SUZUKI Katsuhiko 国立研究開発法人海洋研究開発機構, 海底資源開発研究センター, センター長代理 (70251329) ; SENDA Ryoko 独立行政法人海洋研究開発機構, 地球内部物質循環研究分野, 技術研究副主任 (50377991) ; TANI Kenichiro 独立行政法人国立科学博物館, 地学研究部, 研究員 (70359206) ; ISHII Teruaki 公益財団法人深田地質研究所, 研究員 (80111582)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: マントル / オスミウム同位体 / 強親鉄性元素 / 地球化学的不均質

Outline of Final Research Achievements

In order to understand the chemical structure in the Earth's mantle, reflecting the pattern of mantle convection or mixing efficiency, extents of variations in Os isotope ratios and highly siderophile element concentrations for peridotite-serpentinite recovered from the Pacific area were examined. The results demonstrate that samples from the studied area display almost identical Os-isotope variations to the global population mainly comprised of data from other ocean. This suggests that small-scale heterogeneities created by Proterozoic melt extraction are homogeneously distributed over large scales within the modern convecting mantle.

Free Research Field

固体地球化学