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
[R8-10]Metamorphism and geochronology of epidote blueschists and eclogitic rocks from the Gotsu area, SW Japan
*Akira Takasu1, Fazle Md Kabir2, Shunsuke Endo1, Weimin Li3(1. Shimane Univ., 2. Fujii Consulting & Associates, 3. Jiling Univ. Chaina)
Keywords:
Suo belt,Renge belt,blueschist,pseudosection modeling,K-Ar age
The peak metamorphic conditions blueschist and eclogitic rock exposed in the Gotsu area are estimated as 475-500 C, 14-16 kbar and 570-580 C, 24-25 kbar, respectively. The eclogitic rock is probably correlated to the eclogites in the Renge belt because of the similarity of mode of occurrence and metamorphic condition. K-Ar age of phengite separated from the eclogitic rock is measured as 216 +- 4.6 Ma, which is not the age of the Range metamorphic rock (ca. 300 Ma) but the Suo metamorphic rock (ca. 200 Ma).