Abstract
The Nagarparker area of the Trans-Aravalli Belt comprises Precambrian igneous and metamorphic basement rocks, predominantly granites. These granites are subalkalic to alkalic A-type containing riebeckite, ferro-richterite, ferro-edenite ± arvedsonite amphiboles, and rutile, zircon, apatite, allanite, titanite, titano-magnetite, ilmenite, magnetite and fluorite accessory minerals. The variations in Nb, Y, Ce and Ga and Ga/Al ratios typify the granites of the area as post-orogenic A2-type, formed possibly by partial melting of the island arc crust in a rift-related within plate tectonic setting. The granites of the area yielded U–Th–Pb EPMA zircon and monazite radiometric ages between 1100 and 700 Ma, mostly concentrating around ∼750 Ma. Based on petrological, geochemical and geochronological resemblance of granites of the Nagarparker area with those of the Seychelles islands and the Malani Igneous Suite, it is inferred that being part of Trans-Aravalli Belt of the Indian shield, the Nagarparker area might have shouldered the Seychelles islands towards the western side of the Rodinia before the supercontinent rifted in Neoproterozoic.
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