STRUCTURAL RELATIONSHIPS AND SR-ND ISOTOPE SYSTEMATICS OF POLYMETAMORPHIC GRANITIC GNEISSES AND GRANITIC-ROCKS FROM CENTRAL RAJASTHAN, INDIA - IMPLICATIONS FOR THE EVOLUTION OF THE ARAVALLI CRATON

This paper reviews the state of structural and geochronological knowle dge of Precambrian cratonic rocks in part of central Rajasthan, India, and contributes new observations and isotopic data on the structural features and age of granitic rocks in the area. The granitic rocks com prise plutons of two suites (BGC and Sendra suites), which intrude ort ho- and paragneisses of the Archean Banded Gneiss Complex (BGC) and it s inliers, as well as the Proterozoic Delhi Supergroup. Nearly all the plutons show a foliation and a lineation, which are mostly the result of solid state deformation, although a magmatic component of strain i s apparent in some of them. The intensity of these structural fabrics varies from weak to extremely strong.