Abstract

Dhansiri valley located between Mikir and Naga hills of Upper Assam in the northeastern part of India is characterized by dominantly north-south trending Bouguer anomaly contours. Well data of the area indicate s the presence of Gondwana sediments below Tertiary. A gravity response of the model upto the Sylhet Limestone marker identified from seismic data and basement was simulated and compared with the observed gravity data. The difference between observed and computed gravity is accounted for by the presence of sediments below the Sylhet Limestone marker. The isopach map of sediments between top of Sylhet Limestone marker and Basement shows 200 m