Tectonic Lineament Patterns from Geological and Ground Magnetic Study of Western Part of Adamawa Massif, North Eastern Nigeria

摘要

Ground magnetic survey was conducted using G856-Memory-Mag~(TM) Proton Precision Magnetometer and the Earth's magnetic field data acquired following a regular grid patterns. The aim of the survey is to delineate lineaments patterns and to relate them to the tectonic frame work of the Adamawa Massif of northeastern Nigeria.The study area is composed of granite gneisses, biotite hornblende gneiss and porphyritic granites. Iron mineralized veins and non-mineralized fractures (joints and faults) were found to be predominantly oriented in a NE-SW and NW-SE trends. The magnetic anomalies observed after subjecting the potential field data to Horizontal Derivative filtration technique shows conformity with the direction of flows of rivers and stream channels found in the study area (this indicates structural control of the rivers and streams). These orientations are also concordant with the trends of structural features (foliation/fractural) mapped in the Adamawa Massif of northeastern Nigeria. The present research work has thrown more light on the geology and tectonics of the area.