[S-IT18] GEOPHYSICAL PROPERTIES AND TRANSPORT PROCESSES IN THE DEEP CRUST AND MANTLE

[SIT18-P01] Using LitMod3D for Geophysical and Petrological Modelling of Lithosphere beneath the Japanese Islands

*Tamer Mahmoud Ragab Farag^1,2、Hideki Mizunaga¹、Mohamed Sobh³ (1.Exploration Geophysics lab., Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University、2.Exploration Sector, Nuclear Materials Authority, Egypt、3.Institute of Geophysics and Geoinformatics, TU Bergakademie Freiberg, Germany)

キーワード：Japanese Islands, integrated petrological-geophysical, Thermal modeling

From the late Pliocene to early Quaternary, the east-west compression is dominated the present-day arc system, and the most important geologic events were back-arc opening and arc-arc collision. During the Cenozoic era, the arc-arc collision occurred between the Honshu and Izu-Bonin (Izu-Ogasawara) and the Honshu and Chishima (Kuril) arcs. The main components of Cenozoic Japan are four major island arcs, i.e., Honshu Arc, Ryukyu Arc, Izu-Bonin Arc, and Kuril Arc. We analyzed satellite gravity data to construct a 3-D crustal density model for the Japanese islands. The aim is to model the upper mantle the thermochemical structures by the integration of thermodynamics, mineral physics, geochemistry, petrology, and solid Earth geophysics of the upper mantle around the Japanese Islands using an integrative 3-D approach (LitMod3D). The crustal thickness and Mantle mineralogical composition are constrained by the available seismic data, the gravity inversion constrained by seismic data, and Xenoliths samples, respectively. The highly heterogeneous lithospheric structure reflecting the interplay of the subduction and the tectonics of the area