| Project/Area Number |
24540511
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kyoto University |
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Principal Investigator |
YOSHIKAWA Masako 京都大学, 理学(系)研究科(研究院), その他 (00378605)
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| Co-Investigator(Renkei-kenkyūsha) |
ARAI Shoji 金沢大学, 大学院自然システム学系, 教授 (20107684)
KOBAYASHI Tetsuo 鹿児島大学, 大学院理学研究科, 教授 (70112430)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | かんらん岩捕獲岩 / 沈み込み帯 / 交代作用 / ピナツボ火山 / 微量元素組成 / Sr-Nd同位体比 / 火山フロント / Sr-Nd同位体 / マントル捕獲岩 / ウェッジマントル / マントルウェッジかんらん岩 / スラブ由来物質 |
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| Outline of Final Research Achievements |
Mantle xenoliths brought by subduction-zone magmas can record metasomatism in the mantle wedge (e.g. Arai and Ishimaru, 2008). Pinatubo volcano is located at the volcanic front of the Luzon arc of the Philippines. We present mineral major element compositions, and trace element and Nd-Sr isotopic compositions of amphibole in the Pinatubo peridotite xenoliths, which were observed in the dacite of the 1991 Pinatubo pyroclastic flow deposit. The amphibole exhibits enrichment of fluid-mobile elements such as Rb, Ba, U, Pb, and Sr, and Nd-Sr isotopic features reflecting mixing between asthenospheric mantle and subducting oceanic crusts. These petrological and geochemical characteristics of these mantle xenoliths suggest that mantle wedge beneath the Pinatubo volcano was metasomatized by aqueous fluids derived from subducted oceanic crust.
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