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Experimental Studies on Chemical Structure of the Deep Mantle and Its formation Processes.

深部地幔化学结构及其形成过程的实验研究。

基本信息

批准号：
01420013
负责人：
ONUMA Kosuke
金额：
$ 17.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420013/
关键词：
Mantle Minerals Phase equilibria of silicate at high Pressure Partioning of elements between mantle and core minerals Phase transition at high pressure Martian Interior Density of Minerals 珪酸塩メルトー鉱物の密度逆転高圧下の相平衡マントル鉱物珪酸塩熔融体の密度元素分配 /

项目摘要

Experimental studies on the earth matrials have been performed using the multi-anvil type high pressure apparatus with the following results during the term of project.1. Phase relations among the mantle minerals above 8 GPa : Phase equilibrium diagrams have been determined for the system (1) forstbrite-anorthite-diopside, (2) diopside-enstatite, and (3) forsterite-pyrope. Pressure dependence of the composition of the liquid produced by partial melting and the melting behavior of the minerals present were elucidated.2. Transitions and phase equilibria of the core materials : (1) Transitions of Fe were determined by the electric resistance method developed in our laboratory. (2) Phase equilibria of the system Fe-Fes were determined at 8 GPa.3. Partitioning of elements between core and mantle materials : Partitioning of some elements between mantle minerals, silicate melts, and metal iron above 10 GPa was determined, and the relationships between abundance of these elements and core-mantle equilibrium odel were examined on the basis of the experimental data.4. In-situ observation of MgSiO_3 transition by X-ray diffraction analysis : Transition of clinopyroxene structure - Mg_2SiO_4 spinel +stishovite - ilmenite structure were determined at 20 - 27 GPa.5. Martian Interior model ; High pressure-high temperature experiments were carried out on a estimated martian mantle composition and a structure model of the martian interior were presented, based on the experimental results.6. Density of peridotite melt at high pressures : Pressure dependence of forsterite and peridotite melt were examined with the result suggesting that density cross over between forsterite and Fe-rich peridotite melt is not probable.

在本项目期间，利用多砧式高压装置对土体材料进行了实验研究，取得了以下结果。确定了(1)镁橄榄石-钙长石-透辉石，(2)透辉石-顽辉岩，(3)镁橄榄石-镁橄榄石-辉石体系的相平衡图。阐明了部分熔融产生的液体的组成与压力的关系以及存在的矿物的熔融行为。磁芯材料的相变和相平衡：(1)用我们实验室发展的电阻法测定了Fe的相变。(2)测定了Fe-FeS体系在8 GPA时的相平衡。元素在核幔物质之间的分配：测定了某些元素在10 Gpa以上的地幔矿物、硅酸盐熔体和金属铁之间的分配，并在实验数据的基础上考察了这些元素丰度与核幔平衡模式的关系。用X-射线衍射仪原位观察镁硅氧化物的转变：在20-27 GPa.5范围内，确定了单斜辉石结构--镁硅尖晶石+辉钛矿-钛铁矿结构的转变。火星内部模型：对估算的火星地幔成分进行了高压-高温实验，并根据实验结果提出了火星内部的结构模型。高压下橄榄岩熔体的密度：对橄榄岩和橄榄岩熔体的压力依赖性进行了研究，结果表明，镁橄榄岩和富铁橄榄岩熔体之间的密度不可能发生交叉。