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Experimental and Analytical Studies on Partial Melting Structures of the Upper Mantle and the Lower Crusts

上地幔和下地壳部分熔融结构的实验与分析研究

基本信息

批准号：
10304043
负责人：
OBATA Masaaki
金额：
$ 11.39万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The purpose of this project was to investigate the mechanisms of melting reactions, solid-melt separations and the magma generation through the observation and analysis of mantle-derived ultramafic rocks and migmatitc rocks occurring in high-temperature metamorphic terranes. For this purpose, we purchased in the first year an scanning electron microscope and in the second year, introduced an energy dispersive energy analysis system and assembled them as an energy dispersive electron microanalyzer system. Significant efforts were made to improve the accuracy and precision of the microprobe analysis. Other research achievements made during the research period are as follows : (1) Studies on the Horoman peridotite. Two papers were published in international journals. Characterization of inhomogeneity structure are being made in terms of major and trace element chemistry. (2) The tourmaline-out isograd have been established in the Ryoke metamorphic terrane, Aoyama area, Mie-Prefecture. The destabilization reaction of the tourmaline and the material transfer associated with the partial melting of rocks were investigated. The result have been published in one paper. (3) Geochemical data have been obtained for the migmatite and granitic rocks from the Higo metamorphic terrane, Kyushu. (4) Dehydration melting texture observed in a granitic xenolith enclosed in basaltic lava have been investigated. The results are written in a paper , which is in preparation for submitting to a journal. (5) A theoretical study was made on the rheology of partially molten granitic rocks and a critically review was made for the "Rheologically Critical Melt Percentage (RCMP) concept. The paper is submitted for possible publication in an international journal.

本项目的目的是通过对发生在高温变质岩石中的幔源超镁铁岩和混合岩的观测和分析，探讨熔融反应、固熔分离和岩浆生成的机制。为此，我们在第一年购买了扫描电子显微镜，并在第二年引入了能量色散能量分析系统，并将其组装为能量色散电子显微分析系统。为提高微探针分析的准确度和精确度，进行了大量的努力。研究期间取得的其他研究成果如下：（1）霍罗曼橄榄岩研究。在国际期刊上发表了两篇论文。目前正在从主元素和微量元素化学的角度对不均匀结构进行表征。(2)在三重县青山地区的Ryoke变质岩中建立了碧玺出等值线。研究了电气石的失稳反应和与岩石部分熔融有关的物质转移。结果已发表在一篇论文中。(3)获得了九州Higo变质岩中混合岩和花岗质岩石的地球化学数据。(4)本文研究了玄武质熔岩包体中花岗质捕虏体的脱水熔融结构。结果写在一篇论文中，准备提交给期刊。(5)对部分熔融花岗岩的流变学进行了理论研究，并对“流变临界熔融率”概念进行了评述。该论文已提交，可能在一份国际期刊上发表。