Sengupta, Pulak ; Dasgupta, Somnath ; Dutta, Niloy Ranjan ; Raith, Michael M. (2008) Petrology across a calcareous rock-anorthosite interface from the Chilka Lake Complex, Orissa: implications for neo-proterozoic crustal evolution of the Northern Eastern Ghats Belt Precambrian Research, 162 (1-2). pp. 40-58. ISSN 0301-9268
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.precamres.2007.07.017
Abstract
Mineral assemblages, reaction textures and consideration of deduced mineral reactions in appropriate petrogenetic grids in calc-silicate rocks occurring at the contact of the 0.79 Ga Chilka Lake anorthosite pluton, northeastern part of the Eastern Ghats Belt, India, reveal UHT-metamorphism (T > 1000 ° C) at mid-crustal depths (corresponding to 7 ± 1 kbar). This 0.79 Ga thermal metamorphism completely erased imprints of an earlier (0.96 Ga) granulite facies metamorphism in the calc-silicate rocks. The anorthosite and UHT contact metamorphic rocks were overprinted by amphibolite-granulite facies tectonothermal re-working at 0.69-0.66 Ga. Both the anorthosite-induced UHT metamorphism and the high-grade Pan-African re-working are unique for the Eastern Ghats Belt. These new observations provide clues regarding integration and disintegration of Rodinia and Indo-Antarctic correlation in the Precambrian.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Eastern Ghats; Proterozoic Anorthosite; UHT Contact Metamorphism; Pan-African High-grade Reworking |
| ID Code: | 67396 |
| Deposited On: | 29 Oct 2011 11:11 |
| Last Modified: | 26 Dec 2011 05:19 |
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