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Rheological behavior of glaucophane and lawsonite in experimentally deformed blueschists

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Title
Rheological behavior of glaucophane and lawsonite in experimentally deformed blueschists
Other Titles
실험적으로 변형된 청색편암 내 글루코펜과 로소나이트의 유동학적 특성
Authors
Kim, Daeyeong
Azuma, Shintaro
Seto, Yusuke
Miyake, Akira
Michibayashi, Katsuyoshi
Wallis, Simon
Katayama, Ikuo
Issue Date
2016
Citation
Kim, Daeyeong, et al. 2016. Rheological behavior of glaucophane and lawsonite in experimentally deformed blueschists. European Geosciences Union General Assembly 2016. 비엔나. 2016.04.17~2016.04.22.
Abstract
We performed a series of simple-shear deformation experiments on blueschist at 400?500 C and 1?2.5 GPa. Microstructures of samples deformed at 1?2 GPa are brittle, while they deformed at 2.5 GPa display ductile features. J-indices of glaucophane CPOs systematically decrease by increasing shear strain and confining pressure, and the angle to the shear direction is similar to that of a strain ellipsoid. These results, together with the variable orientations of recrystallized fine grains in a SAED image at 2 GPa, suggest that the brittle-ductile transition of glaucophane occurs at 2 GPa. On the other hand, lawsonite shows abundant fractures in the most specimens and a poor correlation among the J-index, shear strain, and confining pressure. The results demonstrate the predominant role of glaucophane on rheology of blueschist rather than lawsonite. Considering a strong fabric in the starting material and dry experimental condition, the brittle-ductile transition of glaucophane could occur at much shallower pressure than 2 GPa. Therefore our results indicate the dehydration embrittlement of subducting oceanic crust as an important factor in the origin of intermediate-depth earthquakes.
URI
http://repository.kopri.re.kr/handle/201206/8333
Conference Name
European Geosciences Union General Assembly 2016
Conference Place
비엔나
Conference Date
2016.04.17~2016.04.22
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