2016 Fiscal Year Final Research Report
Distribution of frictional heating temperature of fault surface estimated by carbonaceous material Raman geothermometer
| Project/Area Number |
15K21177
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
Solid earth and planetary physics
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| Research Institution | Shimane University |
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Principal Investigator |
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| Research Collaborator |
Hirono Tetsuro
Ikehara Minoru
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | ラマン分析 / 断層 / 摩擦発熱 / 付加体 / 炭質物 |
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| Outline of Final Research Achievements |
We performed microstructural observation and Raman spectroscopic analyses of carbonaceous materials (CM) in the fault rock of 2.5-5.5 km depth of an ancient megasplay fault (an outof sequence thrust in the Shimant accretionary complex) and 14 km depth of a thrust in the Emi group, Hota accretionary complex, exposed on Japan. We also conducted heating experiment of CM in host rock of these fault with anaerobic condition (range:100-1300℃, intervals: 100℃, rate of temperature increase: 20 K/min) in order to investigate the effects of fast heating rate like frictional heating during earthquake.
Raman spectrum of CM of both fault is similar to spectrum of 400-600℃ heating experiment of CM. This result shows that both fault had heating history of 400-600 ℃ by frictional heating. To evaluate the levels of friction, Raman spectrum of the short time maturated experimented CM is useful as calibration tool.
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| Free Research Field |
構造地質学
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