Study of the Vindhyan Sedimentation, Crystalline Basement and Associated Structures below the Alluvial Tracts of Varanasi Region, Uttar Pradesh, by Magnetic and Electrical Methods

Magnetic and electrical investigations were carried out in an area of about 3000 sq. km in the Northeastern part of the Vindhyan basin in Varanasi-Mirzapur area of U.P. Major portion of the area surveyed is concealed under the thick blanket of Gangetic alluvium. The study has helped in delineating the topographic features of the crystalline basement as well as the trend of the Vindhyan and Bijawar sedimentation. Presence of the fault in the northern part of the area with NE-SW orientation is correlated with wrench fault mapped by Raina (1972) about 300 km in the westsouthwest direction. Its presence is also reflected in the Vindhyan sediments as revealed by magnetic and electrical sounding data. A prominent uplift in the basement is mapped to the north of Mirzamurad followed by rather steep slope further south with thicker sediments of the Vindhyan and Bijawars.