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HIGH-PRESSURE EXPERIMENTAL, STUDIES OF DIFFERENTIATION AND LAYERED STRUCTURE OF THE EARTH

高压实验、地球分异和层状结构研究

基本信息

批准号：
10440154
负责人：
NAKAMURA Eizo
金额：
$ 8.19万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10440154/
关键词：
SINTERED DIAMOND SYNCHROTRON DADIATION SnO2 HIGH-PRESSEURE PHASE IRON MELTING EXPERIMENT LIQUIDUS PHASE MORB SUBDUCTED SLAB マグマオーシャン中心核の分離元素分配圧力発生 Spring-8 立方晶SnO2

项目摘要

In situ X-ray study at high-pressure and high -temperature has been developed using the synchrotron radiation at SPring-8 and a multi-anvil apparatus MA) equipped with sintered diamond (SD). Pressures to 40 GPa were generated over ca.5mmィイD13ィエD1. Using this systems termoelastic properties of the cubic SnOィイD22ィエD2 (Pa3-) were determined up to 29 GPa and 1500 K. Exploration of iron "β-Fe" has not be successful so far, and ε-phase is stable up to ca.40 GPa and 1700 K.Melting experiments on natural peridotite were carried out to 35 GPa. It was observed that the first liquidus phase changed from magnesiowustite (Mw) to Mg-perovskite (Mg-Pv) at 31 GPa with increase of pressure. Phase differentiation and element partitioning upon melting were clarified based on analyses of the experimental charges. Fractionation of Mg-Pv and Ca-Pv should proceed predominantly in a magma ocean deeper than 1000 km, which may be directly related to the formation of the geochemical reservoir in the lower mantle. Partioning of Ni and Co between molten iron, and silicate liquid, Mg-Pv and Mw were examined up to 29 GPa. The experimental results suggest that core formation in a 1000km-depth magma ocean is consistent with the observed partitioning data of Ni and Co between the mantle and core.

本文介绍了在SPring-8同步辐射装置和装有烧结金刚石（SD）的多砧装置上进行的高压高温原位X射线研究。在大约5 mm厚D13厚D1上产生了40 GPa的压力。利用该系统测定了立方相SnO_xO_（22）O_xO_（22）O_xO_（22）（Pa ~（3-））在29 GPa和1500 K下的热弹性性质。铁的“β-Fe”相至今尚未发现，ε相在40 GPa和1700 K下稳定。在31 GPa压力下，随着压力的增加，第一液相由镁橄榄石（Mw）转变为镁钙钛矿（Mg-Pv）。根据对实验炉料的分析，阐明了熔化过程中的相分化和元素分配。Mg-Pv和Ca-Pv的分馏主要发生在1000 km以上的岩浆洋中，这可能与下地幔地球化学储集层的形成有直接关系。在29 GPa压力下，研究了Ni和Co在铁水和硅酸盐液体之间的分配，Mg-Pv和Mw。实验结果表明，在1000公里深的岩浆海洋的核心形成是一致的，在地幔和核之间的Ni和Co的分配观察数据。