| Project/Area Number |
15K13579
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Yamaguchi University |
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Principal Investigator |
Owada Masaki 山口大学, 大学院創成科学研究科, 教授 (50213905)
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| Co-Investigator(Kenkyū-buntansha) |
亀井 淳志 島根大学, 総合理工学研究科, 教授 (60379691)
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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 |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 花崗岩体 / 化学的風化 / 化学的風化指標 / 土石流 / 花崗岩 / 風化過程 / 変質作用 / 斜面崩壊 / 風化 / 化学的指標 |
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| Outline of Final Research Achievements |
Some of chemical index are powerful tools for estimating degree of chemical weathering. I determined the chemical compositions from fresh to decomposed granitic rocks using CN(CaO+Na2O), A(Al2O3), K(K2O) diagram, and can classify these rocks into three types; Type 1 to Type 3 with increasing degree of weathering. Type 1 shows decreasing CN from fresh to decomposed rocks. Type 2 indicates increasing K at the beginning of weathering, then decreasing CN. A chemical trend of Type 3 are similar to that of Type 1 but it finally shows decreasing K. Type 2 is most dominant type of chemical weathering in the rock-avalanched fields. It suggests that the cause of decomposed granitic rocks is affected by hydrothermal alteration, and the chemical weathering of Type 2 could be a useful index for the risk of rock avalanche.
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