2013 Fiscal Year Final Research Report
Rheology of serpentinites clarified by high-PT deformation experiments
| Project/Area Number |
22340148
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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 |
Geology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SHIMIZU Ichiko 東京大学, 理学(系)研究科(研究院), 助教 (40211966)
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| Co-Investigator(Kenkyū-buntansha) |
UEHARA Shinichi 東邦大学, 理学部, 准教授 (20378813)
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| Project Period (FY) |
2010-04-01 – 2013-03-31
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| Keywords | 蛇紋岩 / マントルウェッジ / 高温高圧実験 / 沈み込み帯 / 摩擦 / 地震発生過程 / 脆性ー延性転移 / 脱水反応 |
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| Research Abstract |
For better understanding of seismogenic processes in subduction zones in the presence of H2O-fluids, we performed high-temperature and high-pressure deformation experiments of serpentinites. Serpentinites exhibited drastic changes in mechanical properties associated with dehydration of antigorite, a high-temperature phase of serpentine polymorphs. This suggests a close relationship between intra-slab earthquakes and dehydration of serpentinites. In friction experiments of simulated serpentine gouges, dehydration reaction was enhanced along the shear planes. In the friction experiments with varying confining and pore pressures (up to 380 MPa), frictional properties deviated from those expected from the law of effective stress. These results give an insight for the strength of subduction zone megathrusts.
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Research Products
(29 results)
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[Presentation] Geofluid Processes in Subducation Zones and Mantle Dynamics2011
Author(s)
Shimizu I., Watanabe Y., Michibayashi K., Takahashi M., Uehara S., and Katsuta N.
Organizer
Dehydration softening of serpentinite and its roles in the intermediate-depth eartuquakes. First International Symposium on Geofluids
Place of Presentation
Tokyo Institute of Technology, Tokyo, Japan
Year and Date
2011-03-17
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