An Interpretation of the Positive Gravity Anomaly over Bombay on the West Coast of India

Abstract

A study is made of the positive gravity anomaly (about 70 milligals freeair) over Bombay on the west coast of India with the help of new gravity observations made at sea and on land. The Bouguer gravity anomalies are interpreted by considering the geology of the area and constructing a model which best fits the observed anomalies. It is suggested that the positive anomaly is due to a mass of high density rocks (probably olivine gabbro) emplaced in the crust just below the Deccan traps in Bombay area. The mass is about ten kilometres thick with a thinner sill‐like extension to the west. This interpretation is compared with that proposed by Glennie (1951) which was based on more restricted data. Copyright © 1966, Wiley Blackwell. All rights reserved