Primary Sedimentary Structures in Banded Ferruginous Quartzite of Sandur Schist Belt, Karnataka

Banded ferruginous quartzite (BFQ) in the Sandur Schist Belt belongs to the Archaean Dharwar Supergroup of Karnataka and contains primary depositional and diagenetic features. These include banding of different types, ripple marks. syneresis cracks, scour-and-fill structures, globular and nodular structures and penecontemporaneous faults. The significance of these structures in terms of the environment of deposition of BFQ has been considered. The BFQ was deposited as chemical precipitates and passed through a hydroplastic stage of lithification. Shallow water environment of dcposition in a more or less quiet condition with intermittent local disturbances has been envisaged.