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Microstructures of experimentally deformed blueschist

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Title
Microstructures of experimentally deformed blueschist
Other Titles
실험으로 변형된 청색편암의 미구조
Authors
Kim, Daeyeong
Azuma, Shintaro
Seto, Yusuke
Miyake, Akira
Michibayashi, Katsuyoshi
Wallis, Simon
Katayama, Ikuo
Issue Date
2016
Citation
Kim, Daeyeong, et al. 2016. Microstructures of experimentally deformed blueschist. Gordon Research Conference - Rock Deformation. Procdor Academy in Andover NH Unnited States. 2016.08.21~2016.08.26.
Abstract
We conducted a series of high-P deformation experiments under 400?500 °C and 1?2.5 GPa for deciphering the brittle-ductile transition of blueschist. Microstructures of lawsonite and titanite in the experimentally deformed samples are brittle at 1?2 GPa, however ductile at 2.5 GPa. J-indices for glaucophane systematically decrease with increasing shear strain and confining pressure while those for lawsonite are random, indicating strain during experiments is efficiently localized into glaucophane. Angular change of (100) peak with flow direction at >2 GPa is similar to that of a strain ellipsoid and the various orientations of fine grains in a selected area electron diffraction image suggest the brittle-ductile transition of glaucophane at 2 GPa. Considering a strong initial fabric in the starting material and a dry experimental condition, the brittle-ducting transition of glaucophane will be much shallower than 2 GPa. Therefore this study indirectly demonstrates the dehydration embrittlement of subducting oceanic crust (glaucophane) as an important contributor of intraplate intermediate-depth earthquake.
URI
http://repository.kopri.re.kr/handle/201206/8320
Conference Name
Gordon Research Conference - Rock Deformation
Conference Place
Procdor Academy in Andover NH Unnited States
Conference Date
2016.08.21~2016.08.26
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