Geophysical investigation in the different litho units of Gadilam River Basin, Tamil Nadu, India

Abstract

Resistivity survey was conducted in 20 locations to cover different lithologies in the study area. Three major zones were delineated as weathered, fractured and massive in hard rock region and top soil, sandy layer and clayey layer in sedimentary region. Interpreted mastercurves are mostly three-layered curves, namely A type followed by H, K and Q type. This study helps us to identify the weathered zone in the hard rock and contaminated zone by anthropogenic impact in the downstream of river Gadilam.