Geometry, chemistry and hydraulic properties of shear cracks: Rock fracturing processes by geofluid infiltration
| 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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Report
(4 results)
Research Products
(42 results)
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[Journal Article] Contrasting geochemical signatures of Devonian and Permian granitoids from the Tseel terrane, SW Mongolia2016
Author(s)
Burenjargal, U., Okamoto, A., Tsuchiya, N, Uno, M., Horie, K., Hokada, T.
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Journal Title
Journal of Geosciences
Volume: 61
Pages: 51-66
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica2015
Author(s)
Kameda, J., Harris, R.N., Shimizu, M., Ujiie, K., Tsutsumi, A., Ikehara, M., Uno, M., Yamaguchi, A., Hamada, Y., Namiki, Y., Kimura, G.
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Journal Title
Geochemistry, Geophys. Geosystems
Volume: 16
Issue: 8
Pages: 2725-2742
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Geochemistry of accreted metavolcanic rocks from the Neoproterozoic Gwna Group of Anglesey-Lleyn, NW Wales, U.K: MORB and OIB in the Iapetus Ocean2015
Author(s)
Saito, T., Uno, M., Sato, T., Fujisaki, W., Haraguchi, S., Li, Y., Sawaki, Y., Yamamoto, S., Maruyama, S.
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Journal Title
Tectonophysics
Volume: 662
Pages: 243-255
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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