R6: Plutonic rocks, volcanic rocks and subduction factory

[R6P-07] Magma process of the Ryoke plutonic rocks, Yashiro-jima island, Yamaguchi Prefecture, SW Japan.

*Shogo Kodama¹, Masaaki Owada¹, Teruyoshi Imaoka¹, Atsushi Kamei², Yuki Ikeda³ (1. Yamaguchi Univ., 2. Shimane Univ., 3. FUKKEN CO., LTD.,)

Keywords:Southwest Japan, Cretaceous, Granite, Magma processes, Ryoke Belt

The granitoids of the Ryoke Belt in Yashiro-jima island are made up of the Towa Granite (Ryoke younger granite) and Gamano Granodiorite (Ryoke older granite). Both the Towa Granite and Gamano Granodiorite have the geochemical character similar to Volcanic Arc Granite. In addition, their Sr-Nd isotopic compositions resemble each other; thereby suggesting that the granitoids from Yashiro-jima island are originally derived from the similar source materials.