| 研究分担者 |
西 真之 愛媛大学, 地球深部ダイナミクス研究センター, 講師 (10584120)
河合 研志 東京大学, 大学院理学系研究科(理学部), 准教授 (20432007)
市川 浩樹 東京工業大学, 地球生命研究所, 研究員 (50570503)
丹下 慶範 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 研究員 (70543164)
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| 研究実績の概要 |
Magma ocean seems to be an inevitable stage of rocky planets formation where silicate and metals are melted together during accretionary processes that involved chondritic material. Knowledge of the melting temperature and phase relations of chondrite-like materials at high pressure are an important step to understand early planetary differentiation and core formation, as well as bulk composition and redox state of the primordial mantle in early terrestrial planets. The melting temperatures and phase relations of EH3 (Sahara 97027) and CI2 (Tagish Lake) were investigated using the multi-anvil press (MAP) apparatus. Carbonaceous and enstatite chondrites are considered the most relevant building blocks for terrestrial planets in our solar system. In this FY, we conducted a couple of experiments, which aimed to complete he large set of data collected during previous FY.
Our preliminary results show the effect of volatiles of the natural Tagish Lake (CI2) meteorite on its melting temperature with respect to Allende (CV3) meteorite, enstatite chondrite and KLB1, respectively. The coexistence of a metallic Fe-Ni-S liquid coexisting with a C- and H-rich melt is observed in our experiments along with graphite/diamond.
Results on the phase equilibria can be used to derive a model of accretion and possible core segregation that takes into consideration the possible stability of carbon and hydrous species along with a Fe-Ni sulfide melt with important implications for the evolution of the mantle redox state.
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