日本鉱物科学会年会

This study deals with multi-stage mineral growth recorded by lawsonite-blueshist facies metacherts from the Kurosegawa Belt in the Yatsuhiro area, Kyushu. First near-peak stage is represented by Mn-bg. lawsonite and other high pressure hydrous minerals and zig-zag shaped veins. Later post-peak stages are featured by ultra-oxidized and alkali-rich fluid activities which formed todorokite and Ba-bg. K-feldspar veins. These findings are to portlay the fluid activities in shallower part of a subduction zone.