2019 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 19 - Sep 23, 2019Kyushu University Ito Campus
2019 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 19 - Sep 23, 2019Kyushu University Ito Campus
[R8-02]LA-ICP-MS zircon U-Pb ages from Oshima metamorphic rocks and their tectonic background
*Yasuhito Osanai1, Ippei Kitano1, Nobuhiko Nakano1, Tatsuro Adachi1, Sinh Vuong Bui1, Masayuki Komatsu2(1. Kyushu Univ., SCS., 2. Ehime Univ., Sci.)
Keywords:
Zircon U-Pb age,2 stage metamorphism,Oshima metamorphic rocks,tectonic background
LA-ICP-MS zircon U-Pb ages were determined using 7 metamorphic rocks and related 4 plutonic rocks from the high-grade Oshima metamorphic rocks. Age of igneous activity indicates 113-108 Ma. On the other hand, ages of 2 stage of metamorphism were also detected as 121-118 Ma and 110-108 Ma. These igneous and metamorphic evolutions would be tectonically related with Higo metamorphic rocks, Kanto Mountains, and Akukuma metamorphic belt.