2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

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Oral presentation

S1/R6 Joint session: Earth materials science related to igneous processes/Plutonic rocks, volcanic rocks and subduction factory

Sun. Sep 18, 2022 9:00 AM - 12:15 PM B351 (Adv. Edu. Res. Bldg. E-3F)

Chairperson: Atsushi Kamei(Shimane Univ.), Tatsuhiko Kawamoto(Shizuoka Univ.), Morihisa Hamada(JAMSTEC), Masao Banno(Yamagata Univ.)

9:15 AM - 9:30 AM

[S1R6-02] Magmatic processes and geochemical characteristics of Tsubashiki diorite complex, Sanyo belt, Shimonoseki, Yamaguchi Prefecture

*Masaaki Owada1, Satoko Matsumoto2, Atsushi Kamei3 (1. Yamaguchi Univ. Sci., 2. Kikukawa J-high sch., 3. Shimane Univ. Sci.)

Keywords:Sanyo belt, Magmatic activity, Tsubashiki diorite complex

The Tsubashiki diorite complex is situated in the Sanyo belt, Yamaguchi Prefecture, southwest Japan. Based on the petrological investigation, the diorite complex was caused by fractional crystallization from a single parental magma, and geochemically shares the previously activated north Kyushu batholiths rather than the plutonic rocks from the Sanyo belt. It is inferred that the petrogenetic processes partly take over the features from the north Kyushu magmatic activity.