Japan Geoscience Union Meeting 2016

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Poster

Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS27] Fault Rheology and Earthquake Physics

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Yuko Kase(Geological Survey of Japan, AIST), Ryosuke Ando(Graduate School of Science, University of Tokyo), Wataru Tanikawa(Japan Agency for Marine-Earth Science and Technology, Kochi Instutute for Core Sample Research), Hideki Mukoyoshi(Department of Geoscience Interdisciplinary Graduate School of Science and Engineering, Shimane University)

5:15 PM - 6:30 PM

[SSS27-P24] Experimental demonstration for blackening of pseudotachylyte

*Yuki Nakano1, Shunya Kaneki1, Tetsuro Hirono1 (1.Department of Earth and Space Science, Graduate School of Science Osaka University)

Keywords:pseudotachylyte, blackening

Pseudotachylyte, basically formed by frictional melting at earthquake, sometimes shows various colors of not only black but also of greenish black and grayish black. The color might be correlated to the mineral assemblage, slip parameter, and environmental condition, but such relationship has not yet been investigated. We here demonstrated to form pseudotachylyte by using high-temperature furnace on the artificial mixture samples of quartz, albite, biotite, and chlorite. The melted product after heating the mixture of quartz and albite at 1300 °C did not show the blackening, whereas the products using the mixtures with 10 wt.% biotite and/or 10 wt.% chlorite became remarkably black. By taking consideration into the SEM-ESD data, we concluded that Fe-bearing minerals plays an important role for the color transition, especially, blackening in pseudotachylyte.