期刊
PRECAMBRIAN RESEARCH
卷 266, 期 -, 页码 506-529出版社
ELSEVIER
DOI: 10.1016/j.precamres.2015.05.030
关键词
Rengali Province; Eastern Ghats Province; Grenvillian; Rodinia; Geochronology; Metamorphism
资金
- DeutscheForschungsgemeinschaft (Leibniz Award)
- Department of Geology and Geophysics, IIT Kharagpur
The timing of amalgamation of the Eastern Ghats Province with the Indian shield is central to the correlation between proto-India and east Antarctica in reconstructions of the supercontinent Rodinia. In this study, the metamorphic and geochronological evolution of the Malayagiri supracrustal belt in the Rengali Province, a wedge-shaped Neoarchean cratonic terrane located between the Paleo-Mesoarchean Singhbhum cratonic nucleus and the Meso-Neoproterozoic Eastern Ghats Province has been used to constrain the suturing of the Eastern Ghats Province with the Singhbhum Craton. The Malayagiri supracrustal rocks were deposited in the Neoarchean between 2.79 and 2.42 Ga. The similar to 2.80 Ga Pal Lahara-Kamakhyanagar Gneiss served as the basement to the supracrustal sequence. The supracrustal rocks were affected by three major tectonothermal events at similar to 2.42 Ga, 0.98-0.94 Ga, and 0.57-0.54 Ga and a minor thermal event at similar to 0.82 Ga. The Grenville-age metamorphism reached upper amphibolite facies conditions along a clockwise P-T path. The Eastern Ghats Province granulites in the vicinity of the Malayagiri supracrustal belt are characterized by major tectonothermal events at ca. 1.22 Ga, similar to 0.98 Ga, similar to 0.81 Ga, and similar to 0.62-0.50 Ga. The Malayagiri supracrustal rocks and the Eastern Ghats Province granulites had a common geological history since the early Neoproterozoic with both terranes sharing the 0.98-0.94 Ga, 0.85-0.80 Ga and 0.62-0.50 Ga tectonothermal events. The earliest event shared by the two terranes corresponds to the suturing of the Eastern Ghats Province granulites with the southern margin of the cratonic Rengali Province. Thus, the docking of the Eastern Ghats Province with cratonic India first took place during the Grenvillian and not during the Pan-African orogeny implying that proto-India was welded together with east Antarctica along the Grenville-age Eastern Ghats Province-Rayner complex orogen. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据