Tectonics of the Eastern GhaLs Mobile Belt of India -Study of Proterozoic Events in EasL Gondwana-

印度东部GhaLs活动带的构造-EasL Gondwana元古代事件研究-

基本信息

批准号：
08041109
负责人：
YOSHIDA Masaru
金额：
$ 6.34万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08041109/
关键词：
Indian Shield Eastern Ghats Mobile Belt Granulite Proterozoic Sri Lankan granulites Gondwanaland Kerala Khodalite Belt Calc-silicate granulite グラファイト

项目摘要

Field based geological studies of Eastern Ghats, South India and Sri Lanka were conducted. Major results are as follows which appeared in 101 scientific publications.(1) Sm-Nd and Rb-Sr ages, and U-Pb isotopic and U-Th-Pb chemical ages of monazite and zircon were obtained. Circa 2500 and 2000 Ma of the precursory rocks, ca 1500, 1000, 700-800, and 500 Ma ages of repeated tectonothermal events were obtained.(2) Small scale rootless isoclinals folds and sheath folds proceeding the major isoclinals folds were identified in the central Eastern Gahts Mobile Belt.(3) Corundum-quartz assemblage were discovered in the metapelite from the central Eastern Ghats Mobile Belt. The metapelite suffered higher conditions than ca 13 Kb and 1150℃, and then drastic isothermal decompression to ca 9 kb and 950℃, followed by isosbaric cooling then isothermal decompression.(4) The polymetamorphic history of the Eastern Ghats Mobile Belt identified from the present study suggests that the juxtaposition with the Rayner Complex of Antarctica vas later than ca 1500 Na, and most possibly during the ca 1000 Ka event.(5) The Achankovil Shear Zone of South India vas found to have suffered the sinistral shear, at least in its central portion.(6) Petrological studies of granulites in central Sri Lanka and calc-silicate rocks and alkaline acid intrusive in South India, and tectonic studies of Precambrian East Gondwanaland were also examined.

对东高止山脉，南印度和斯里兰卡进行了基于现场的地质研究。主要结果如下，出现在101个科学出版物中。（1）SM-ND和RB-SR年龄以及U-PB同位素和U-TH-PB化学年龄获得了单唑和氧化锆。大约2500和2000 mA的前保质岩石，CA 1500、1000、700-800和500 MA年龄的重复的构造体热事件。（2）（2）在中央东部的gahts Mobermant in Cormapt in Cornape in Cormapt in Cormapt。东方商品移动带。 The metapelite suffered higher conditions than ca 13 Kb and 1150℃, and then drastic isothermal decompression to ca 9 kb and 950℃, Followed by isosbaric cooling then isothermal decompression.(4) The polymetamorphic history of the Eastern Goods Mobile Belt identified from the present study suggests that the juxtaposition with the Rayner Complex of Antarctica vas later than ca 1500 Na, and most likely during the ca （5）印度南部VAS的Achankovil剪切区发现至少在其中央部分遭受了罪行剪切。（6）斯里兰卡中部的颗粒岩岩和硅硫酸盐的岩石学研究以及在印度的南印度核酸含量和酒精酸侵入性的核心研究，以及前卫生部的East Gondwananalandanalandains the Precambrian East gondwananalandainsed。