STRUCTURAL GEOMETRY AND STRAIN HISTORY OF THE EARLY PROTEROZOIC ARAVALLI ROCKS OF GORIMARI, UDAIPUR DISTRICT, RAJASTHAN

Detailed mapping and analyses of the structural elements from Gorimari revealed a complex structural geometry and deformation history of the rocks. Only two prominent planar structural elements have been observ ed i.e., the bedding schistosity (S-0/S-1) and cleavage (S2). The earl iest AF1 and the later AF2 folds on every scale are suggestive of recl ined geometry. The strain analyses of AF1 and AF2 folds suggest their initiation by buckling and subsequent flattening resulting into class IC geometry. Some of the folds show a complex geometry which may be du e to original layer irregularities or may be due to differential flatt ening because of the variation in thickness of single layer. The Value s of compressive apparent strain ratio varies from 0.1 to 1.0. Stratig raphically these rocks are equivalent to the Early Proterozoic rocks o f Bagdunda. The grade of metamorphism is of lower amphibolite facies.