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
[R8P-02]Estimation of P-T path of garnet peridotite from a northeastern part of the Su-Lu region, China「発表賞エントリー」
*Yu Oikawa1,2, Daisuke Nakamura1, Takao Hirajima2, Tomoaki Morishita3, Akihiro Tamura3, Hajime Yamane1(1. Okayma Uni. Sci., 2. Kyoto Uni. Sci., 3. Kanazawa Uni. Sci.)
Keywords:
garnet peridotite,Su-Lu region,Chijiadian
We estimated P-T path of garnet peridotite from a northeastern part of the Su-Lu region of China. A garnet megacryst in the studid sample has Cr-rich rim. Cr contents discontinuously increase at the rim. Applying thermobarometers, pairs of the Cr-rich rim and matrix Opx gave higher P-T (4.1GPa, 770 ºC) than those of its core and Opx inclusions (1.0GPa, 660 ºC). Thus, this garnet megacryst grew at relatively low T and shallow levels, and then the Cr-rich rim was formed by rapid compression. In addition, we interpret this Cr-rich rim has been also affected by metasomatic fluid infiltration.