Probable Imprints of Neotectonics or Recent Crustal Movements in Bansloi River Basin, Rajmahal Volcanic Province, Jharkhand, India

Abstract

The probable imprints of neotectonics on the shape and drainage characteristics of
the Bansloi river basin, located in the southern portion of the Rajmahal hills, is the subject
matter of enquiry in this article. The asymmetric cross section and the series of prominent
convexity and concavity of the main and tributary basins have been attributed to the
dynamics of regional tectonics (specifically the evolution of Himalayas to its north) on the
river systems of the area. The formation of a centripetal drainage site at the lowest reach
of the Bansloi due to its sudden northerly turn despite the eastward dip and topographic tilt
of the area is another imprint of the neotectonic movement in the area. The sudden northerly
turn of the Bansloi appears to have captured the lowest reach of the Torai river, the only
left bank tributary of Bansloi, thereby lending a tributary status to this erstwhile independent
main river