| Project/Area Number |
15K17783
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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 |
Petrology/Mineralogy/Economic geology
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| Research Institution | Tohoku University |
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Principal Investigator |
Uno Masaoki 東北大学, 環境科学研究科, 助教 (50748150)
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| Research Collaborator |
Mindaleva Diana
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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 |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 剪断クラック / 地殻流体 / 流体移動 / 変成岩 / 流体流入時間スケール / 流体圧勾配 / 透水係数 / 岩石―流体反応 / 亀裂閉塞タイムススケール / 流体圧分布 / 反応―移流―拡散 / 反応帯形成フォーワードモデル / 流体流れ / 力学ー化学ー水理学 / 歪み分配 / 反応帯 / エシュロンクラック / 流速 / 差応力 |
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| Outline of Final Research Achievements |
In this study, new methods were developed for constraining the time-scale, fluid-pressure gradients, and permeability of crustal fluid-rock fracture samples. As analogies for island arc and continental arc crusts, fluid-rock reaction zones were investigated for Sanbagawa metamorphic belt and Sor Rondane Mountains of east Antarctica. The results revealed very short fluid infiltration time-scales of several hours to days, high fluid-pressure gradients of ~kbar/cm from the cracks to the host rocks, and very high and low permeabilities for the cracks and the host rocks (~-15 and -20 to -23 in log10 [m2] unit, respectively). These time-scales and hydraulic parameters enables quantitative comparisons between geophysically-observed fluid transport phenomena and geologically-observed shear cracks.
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