STRUCTURAL GEOMETRY OF THE ROCKS OF THE SOUTHERN PART OF THE NALLAMALAI FOLD BELT, CUDDAPAH BASIN, ANDHRA-PRADESH

A sequence of quartzite, banded phyllite and slate in the southern par t of the Nallamalai fold belt shows a series of macroscopic gently plu nging folds (D1) with NW-SE striking axial plane and a pervasively dev eloped axial planar slaty cleavage. A weak later deformation has produ ced sporadic gentle folds (D2) with axial planes at high angle to the D1 fold axial planes. The rocks along the eastern contact of the belt are mylonitized and the intensity of deformation gradually dies away t owards west. A zone of tectonic dislocation is envisaged between the b asement granite gneiss towards the east and the supracrustal Nallamala i rocks.