Palaeocurrent and Clastic Dispersal Pattern of the Proterozoic Alwar Group around Jaipur, Northeastern Rajasthan

Abstract

The Proterozoic Alwar Group of tje Jaipur area, northeastern Rajasthan, includes two formations: the Rajgarh Formation, predominantly comprising conglomerate-feldspathic quartzite-arkosic grit association with subordinate phyllite and schist; and Kankwarhi Formation, representing an interbedded sequence of thinly bedded quartzite, phyllite and schist. These sediments were accumulated in tidal flat and fluvial environments in a fault-controlled basin.

Palaeocurrent study reveals that sediments were transported by external agency (river) from southeast, south, and southwest, and were dispersed within the depository by offshore and onshore currents and also by across-slope currents. The dispersal pattern so obtained is in close agreement with a coastal environment and hence it is suggested that cross-stratification can be utilized for palaeocurrent studies and palaeogeographie reconstruction even in a tectonically deformed terrain.