| Project/Area Number |
15H03746
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Hokkaido University |
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Principal Investigator |
Kameda Jun 北海道大学, 理学研究院, 准教授 (40568713)
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| Co-Investigator(Renkei-kenkyūsha) |
SUGIYAMA Kazumasa 東北大学, 金属材料研究所, 教授 (40196762)
TSUTSUMI Akito 京都大学, 大学院理学研究院, 助教 (90324607)
TAKESHITA Toru 北海道大学, 大学院理学研究院, 教授 (30216882)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | 断層岩 / メカノケミストリー / 摩擦発熱 / 粘土鉱物 / スメクタイト / 非晶質 / 断層ガウジ / X線構造解析 / 地震 / 断層 |
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| Outline of Final Research Achievements |
Thermal and mechanical activations on hydrous clay minerals in fault zones are examined. High-temperature XRD experiments demonstrated that kaolinite and chlorite, typical clay components in crustal faults, dehydroxylate in a different manner, which can be utilized as a new temperature proxy for seismogenic faults in subduction zones. In addition, we showed that mechanical action can facilitate mineral dehydroxylation reaction due to selective degradation of clay interlayers connected by hydrogen bondings. We also investigated smectite/illite mixed layers around a slip zone of the mega-branching fault of the Nankai Trough, and showed that mechanochemical processes possibly associated with seismogenic faulting can activate its transfrormation reaction by reducing the activation energy of the reaction.
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