| Project/Area Number |
21540495
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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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, 大学院・理学研究科, 教務補佐員 (00378605)
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| Co-Investigator(Renkei-kenkyūsha) |
ARAI Shoji 金沢大学, 自然システム学系, 教授 (20107684)
SHIBATA Tomoyuki 京都大学, 大学院・理学研究科, 助教 (40332720)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | マグマ / 火成岩 / 上部マントル / 捕獲岩 / Sr-Nd同位体組成 / 微量元素組成 / マントル捕獲岩 / 背弧リソスフェア / 開放的融解 / 沈み込み帯域マントル |
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| Research Abstract |
Ultramafic xenoliths from Kurose, Southwest Japan represent fragments of the lithospheric mantle beneath the back-arc of the active Southwest Japan volcano-tectonic arc. We divided the Kurose peridotite xenoliths into three types, on the basis of the Sr-Nd isotopic and trace element compositions of the clinopyroxenes in the 13 ultramafic xenoliths,(1) Japan-Sea basalt type which shows depletion of incompatible elements and similar variation of Sr-Nd isotopic compositions of Japan-Sea basalts,(2) EM I type which has similar Sr-Nd isotopic compositional range of Cenozoic balasts of Kyushu and(3) EM II type with enriched Sr-Nd isotopic composition and incompathible elements. These xenoliths would have experienced the following events ;(1) open-system partial melting of the continental lithosphere with influx of an asthenospheric melt with MORB-like isotopic composition during the back arc basin the Japan Sea opening,(2) metasomatism with the asthenospheric melt related to the Kyushu basalts.
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