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Metamorphism and Tectonics of the Eastern Ghats Granulite Belt, India.

印度东高止麻粒岩带的变质作用和构造。

基本信息

批准号：
08454160
负责人：
YOSHIDA Masaru
金额：
$ 4.86万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

The research aimed to obtain a recent knowledge of geology of Eastern Ghats Granulite Belt and related areas in East Gondwana, and to reach to a better understanding on the tectonothermal history of the Eastern Ghats belt. Systematic bibliographic survey and petrological and geochronological analysis of rock samples were conducted for 3 years from April 1996 to March 1998. A newly installed equipment on fluid inclusion analysis, along with existing facilities including EPMA, XRF, etc were utilized for the analytical studies. Geochronological analysis was conducted in collaboration with other institutions. Major results of the research include the followings.(1) EPMA monazite dating and Sm-Nd dating suggested several superposed events occurred during ca 2000 to 500 Ma. Major metamorphic event is estimated to be ca 2000 Ma and 1500 Ma. Geochemical signature of related igneous rocks suggested that the earlier event took place under the compressional regime and the later event, under the extensional regime.(2) Further later events include granulite facies metamorphism under compressional tectonic regime at around 1000 Ma, and some other tectonothermal events took place at around 800 Ma and 500 ma, both being associated with granitic intrusions.(3) Results of the present research project were published in 15 English books, 59 papers in various scientific journals mostly in English, and 56 oral presentations at mostly international symposiums.

研究旨在了解东高止特麻粒岩带及东冈瓦纳相关地区的最新地质知识，并对东高止特麻粒岩带的构造热史有更深入的了解。从1996年4月至1998年3月，对岩石样品进行了系统的书目调查和岩石学和地质年代学分析。利用新安装的流体包裹体分析设备，以及现有的EPMA、XRF等设备进行分析研究。地质年代学分析是与其他机构合作进行的。本研究的主要成果包括：(1) EPMA独居石测年和Sm-Nd测年表明，2000 ~ 500 Ma期间发生了多个叠加事件。主要变质事件估计在2000 Ma和1500 Ma之间。相关火成岩地球化学特征表明，早期事件发生在挤压作用下，晚期事件发生在伸展作用下。(2) 1000 Ma左右挤压构造条件下的麻粒岩相变质事件，以及800 Ma和500 Ma左右的构造热事件，均与花岗岩侵入有关。(3)本课题研究成果已出版英文专著15部，在以英文为主的各类科学期刊发表论文59篇，在以国际学术会议为主的学术会议上作口头报告56篇。