Aeromagnetic Response over Northern Margin of Eastern Ghat Mobile Belt, Deogarh District, Orissa

Aeromagnetic data over Riamal-Deogarh-Lodhajhan area (Degree sheet 73C), Deogarh district, Orissa has been interpreted in terms of geology and structure around the contact zone of the Eastern Ghat Mobile (EGM) belt and North Onssa-Singhbhum (NOS) craton Several major longitudinal and later phased oblique faults have been identified fragmenting the crustal block contact zone between the granulite facies rocks of EGM belt and the greenschist-lower amphibolite facies supracrusta! rocks of NOS craton Both northern and southern boundaries of the high-grade Rengah charnockite assemblage are outlined with strong linear magnetic anomalies with dominant normal remanent magnetization Basic/ultrabasic members of charnockite pluton or highly magnetic Ductile Shear Zones (DSZ) appear to define the boundary of the Rengah charnockite belt The northern limit of the Rengali charnockite belt may be considered as the northern Fermor line of the EGM belt Major magnetic longitudinal and oblique faults are suggested for detailed ground check up for possible location of alkaline plutomc rocks and chromiferous ultrabasic rocks, if any.