Abstract
Interpretation of 1:1,000,000 scale LANDSAT imagery and reconnaissance structural analysis has revealed a pattern of tectonic evolution in the South Indian craton extending from Archaean times to the late Proterozoic. The precursors of the Archaean granitoid gneisses and supracrustal rocks were disrupted by a series of N—S late Archaean shear belts with various senses of movement, leading to a division into high and low finite-strain domains and the main tectonic “grain” of much of the craton. Climatic metamorphism to as high as granulite facies was superimposed on these domains. The dehydration associated with granulite facies metamorphism may have been due to guiding of CO 2-rich vapours by these shear belts. Postkinematic late Archaean to early Proterozoic granites are distributed in close relation to the shear belt fabrics. Mid to late Proterozoic deformation resulted in the overthrusting of the intercratonic Proterozoic Cuddapah Basin by Archaean rocks from the east, and the development of a major dextral shear system about which the northern part of the craton moved at least 70 km eastwards relative to the southern part.
Published Version
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