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
[R8-08]Blueschist facies impure metachert as remarkable oxygen- and overlooked water-carriers in the subduction zone
*Wataru J YABUTA1, Takao HIRAJIMA1(1. Grad. Sci., Kyoto Univ.)
Keywords:
subduction zone,metacherts,deep-fluids,mass transfer
Chemical compositions and mode of occurrence of HP minerals are measured to appreciate mass transfer by lawsonite-blueshist facies Mn-bg. metacherts from the Kurosegawa Belt in Yatsuhiro, Kyushu. Mn-bg. lawsonite is the strongest water budget with 10 wt% H2O content, and enables 3 wt% in a certain sample. Oxygen is remarkably carried by haematite, with the carriage 500 times larger than eclogite (Malaspina et al., 2012). These findings are to draw a minute, lively image of the subduction zone.