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

本项目的目的是通过对高温变质地体中产于地幔的超镁铁岩和混合岩的观测和分析，研究其熔融反应、固熔分离和岩浆生成的机制。为此，我们在第一年购买了一台扫描电子显微镜，第二年引进了能量色散能量分析系统，并将它们组装成能量色散电子显微分析系统。在提高微探针分析的准确度和精密度方面做出了重大努力。研究期间取得的其他研究成果如下：(1)霍罗曼橄榄岩研究。两篇论文发表在国际期刊上。从常量元素和微量元素化学的角度对非均质结构进行了表征。(2)在三叠县青山地区的Ryoke变质地体中建立了电气石出射等值线。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。研究结果已发表在一篇论文上。(3)获得了九州HIGO变质地体中混合岩类和花岗岩类的地球化学资料。(4)对玄武岩熔岩包体中观察到的花岗岩捕虏体脱水熔融结构进行了研究。结果被写在一篇论文中，准备提交给一本期刊。(5)对部分熔融花岗岩的流变学进行了理论研究，并对“流变学临界熔融百分率”的概念进行了批判性评述。

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.