Japan Geoscience Union Meeting 2016

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International Session (Oral)

Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT06] Interaction and Coevolution of the Core and Mantle

Mon. May 23, 2016 1:45 PM - 3:15 PM 304 (3F)

Convener:*Satoru Tanaka(Department of Deep Earth Structure and Dynamics Research Japan Agency for Marine-Earth Science and Technology), Taku Tsuchiya(Geodynamics Research Center, Ehime University), Chair:Satoru Tanaka(Department of Deep Earth Structure and Dynamics Research Japan Agency for Marine-Earth Science and Technology), Hiroki Ichikawa(Geodynamics Research Center, Ehime University)

Recent observational and experimental investigations have significantly advanced our understanding of the structure and constituent materials of the deep Earth. However, details of the chemical composition of the mantle, accounting for 80% of the volume of the entire Earth, and light elements expected to exist in the core, corresponding to the remaining 20%, have remained unclear for over 60 years. Seismological evidence has suggested a vigorous convection at the core-mantle boundary region, whereas geochemistry has suggested the presence of stable regions that hold the chemical signature of early Earth's formation at 4.6 gigayears ago. In addition, the amounts and types of radioactive isotopes that act as the heat sources that drive the dynamic behaviors of the deep Earth are also still largely unknown. We provide an opportunity to exchange the achievements and ideas, and encourage the persons who try to elucidate these unresolved mysteries of deep Earth science through comprehensive investigations of the interactions between the core and mantle by combining high-pressure and high-temperature experiments, microscale geochemical analysis, high-resolution geophysical observations, geo-neutrino observations and large-scale numerical simulations.

2:15 PM - 2:30 PM

[SIT06-15] Dissolution of hydrogen into iron by the dissociation of hydrous minerals under pressure

Riko Iizuka2, *Takehiko Yagi1, Hirotada Gotou3, Takuo Okuchi4, Takanori Hattori5, Asami Sano-Furukawa5 (1.Geochemical Research Center, The University of Tokyo, 2.Geodynamics Research Center, Ehime University, 3.Institute for Solid State Physics, The University of Tokyo, 4.Institute for Study of the Earth's Interior, Okatama University, 5.J-PARC center, Japan Atomic Energy Agency)

2:45 PM - 3:00 PM

[SIT06-17] Electrical resistivity of substitutionally disordered hcp Fe-Si and Fe-Ni alloys: Chemically-induced resistivity saturation in the Earth’s core

*Hitoshi Gomi1, Kei Hirose2, Hisazumi Akai3, Yingwei Fei4 (1.Institute for Study of the Earth's Interior, Okayama University, 2.Earth-Life Science Institute, Tokyo Institute of Technology, 3.Institute for Solid State Physics of the University of Tokyo, 4.Geophysical Laboratory, Carnegie Institution of Washington)