Use of GGM Derived Gravity Anomaly for Regional Reconnaisance Exploration

Abstract

Considering the rigors of terrain based gravity observation and subsequent reductions, EGM 2008 derived gravity anomaly is herein suggested as an alternative measure in reconnaissance exploration. Aerial gravity anomaly maps of Niger State (north-central Nigeria) have been used to make inference(s) on the geologic information and the nature of crust. Attempt was made to interpret the Bouguer map based on distribution, nature, and characteristics of anomalies and integrate the data with known geologic and tectonic features. The Bouguer anomaly map was superimposed on geographical map of Niger State to determine the geographical locations with gravity/lows and highs and corresponding closures. It reveals that the gravity anomaly map helps delineate major tectonic boundaries and infer the structural trends of the area. It is observed that the gravity high zones are associated with geologic structure-like lineaments in their proximity.