| Project/Area Number |
22244067
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 |
HIRAJIMA Takao 京都大学, 理学(系)研究科(研究院), 教授 (90181156)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Takefumi 京都大学, 理学(系)研究科(研究院), 教授 (10251612)
OHSAWA Shinji 京都大学, 理学(系)研究科(研究院), 教授 (30243009)
KAWKAMI Tetsuo 京都大学, 理学(系)研究科(研究院), 助教 (70415777)
SHIMOBAYASHI Norimasa 京都大学, 理学(系)研究科(研究院), 教授 (70235688)
MIYAKE Akira 京都大学, 理学(系)研究科(研究院), 准教授 (10324609)
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| Project Period (FY) |
2010-04-01 – 2013-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥48,230,000 (Direct Cost: ¥37,100,000、Indirect Cost: ¥11,130,000)
Fiscal Year 2012: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2011: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2010: ¥37,310,000 (Direct Cost: ¥28,700,000、Indirect Cost: ¥8,610,000)
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| Keywords | 変成岩 / 深部流体 / 多相固体包有物 / ICP-MS / LA-ICP-MS / 流体包有物 / クラッシュリーチング法 / ICP-MS分析 |
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| Research Abstract |
Multi-solidphase inclusions (MSIs) composed of clinozoisite (Czo) + ky + qz have been found within garnets and in the matrix of metapelits from the Makbal complex in Kyrgyz. The reconstructed compositions of MSIs are consistent with lawsonite (Lws). Petrological study showed that Lws was stable at UHP stage (ca. 3 GPa and 550C) and decomposed to the MSIs during isothermal decompression around 1.6 GPa and 550C. Trace element characteristics of Czo grains in the MSIs show a flat REE chondrite-normalized pattern, identical to the typical REE pattern of Lws. Thus, the REE content of Czo in the MSIs included in garnet was likely inherited from the former Lws as the decomposition reaction took place isolated from the matrix. Lws decomposition and Czo-forming reactions accompany fluid release during the isothermal decompression stage, implying that the fluids can be generated not only during subduction, but also during exhumation of UHP rocks in cold subduction settings.
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