2016 Fiscal Year Final Research Report
Fundamental study on mineral vein formation by sealing experiment of rock fracture
| Project/Area Number |
26287132
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
渡邉 則昭 東北大学, 環境科学研究科, 准教授 (60466539)
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| Co-Investigator(Renkei-kenkyūsha) |
Muto Jun 東北大学, 大学院理学研究科, 准教授 (40545787)
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| Research Collaborator |
Yamada Ryo
Saishu Hanae
Tanaka Hiroto
Wendler Frank
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 水熱実験 / 岩石亀裂 / シリカ / 石英脈 / 溶解・析出 / 浸透率 / X線CT / 振動 |
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| Outline of Final Research Achievements |
A new hydrothermal flow-through apparatus was developed, which enables us to investigate the dissolution and precipitation processes of fractured rocks at sub to supercritical conditions under confining pressure, and the evolution of aperture structures by X-ray CT. In the dissolution experiments of fractured granite, large pores and preferential flow paths were created by rapid dissolution of quartz and gauge parts, suggesting that formation of large fluid pockets induced by water-rock interaction within the crusts. In silica precipitation experiment at supercritical condition, amorphous silica precipitated at the inlet, which caused fracture sealing effectively, compared to quartz overgrowth from the fracture walls. The fracture sealing by silica precipitation produced a characteristic fluid pressure oscillation, which may indicate an importance analogue of the cycle of silica precipitation - fluid pressure rise (earthquake).
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| Free Research Field |
岩石・鉱物・鉱床学
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