BANAS DISLOCATION ZONE IN NATHDWARA KHAMNOR AREA, UDAIPUR DISTRICT, RAJASTHAN, AND ITS SIGNIFICANCE ON THE BASEMENT-COVER RELATIONS IN THE ARAVALLI FOLD BELT

The relationship of the Lower Proterozoic Aravalli fold belt of Rajast han with the essentially Archaean Banded Gneissic Complex (BGC) has a significant bearing on the basement-cover relations. In major parts, t he interface is a tectonized uoconformity, but in the northern extremi ty of this fold belt this relationship is problematic. It is shown her e that in the Nathdwara-Khamnor area a prominent dislocation, the Bana s Dislocation Zone (BDZ), interpreted as a dextral strike-slip fault, separates the Aravalli fold belt and the BGC. The rocks of the Hammer- bead syncline of Heron1 belong to the basement BGC, and these are juxt aposed against the Aravalli fold belt along the BDZ. The BDZ might rep resent a reactivated boundary fault of the Aravalli rift basin, the ea rlier structures having been variably rotated and reoriented within th e BDZ. The BDZ is linked with the thrust tectonics of the Aravalli fol d belt.