一般社団法人日本鉱物科学会2019年年会・総会

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R8: 変成岩とテクトニクス

2019年9月20日(金) 09:30 〜 17:00 A-プレゼンスペース (イースト1号館)

09:30 〜 17:00

[R8P-11] Pressure–temperature condition of pelitic gneisses from the Mutis Metamorphic Complex, Timor Island, Indonesia

*Fransiska Ayuni Catur Wahyuandari1, Yasuhito Osanai1, Nobuhiko Nakano1, Tatsuro Adachi1, Nugroho Imam Setiawan2 (1. Kyushu University, 2. Universitas Gadjah Mada)

キーワード:Geothermobarometry, P-T condition, Mutis Metamorphic Complex, Timor

Garnet-bearing pelitic gneisses mostly exhibit prograde zoning pattern meanwhile 1 rock sample of pelitic gneiss containing sillimanite exhibits homogenous wide core with a retrograde thin rim. Partial replacement of garnet grain by biotite, chlorite, and other secondary minerals suggest that metamorphic rocks in Mutis metamorphic complex are affected by retrograde metamorphism during cooling.