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Markandeyulu, A.
- Gravity and Magnetic studies Around Lotapahar, Singhbhum District, Bihar-An Application to Uranium Exploration
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Authors
Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Begumpet, Hyderabad-500 016, IN
1 Atomic Minerals Division, Department of Atomic Energy, Begumpet, Hyderabad-500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 2 (1995), Pagination: 149-156Abstract
The potential capabilities of gravity and magnetic methods in the evaluation of geologic structures have been effectively utilised. Using these methods, semi-detailed surveys were conducted around the radioactive occurrences at Lotapahar (22°36'30"N. and 85°35'E.), in the western sector of the Singhbhum shear zone, primarily to decipher structural features, the common host for Uranium mineralisation.
The interpretation of gravity and magnetic data enabled delineation of a ENE-WSW trending fracture zone. Forward modelling of a gravity profile yields the sub-surface disposition of this fracture zone and facilitated planning of boreholes for uranium exploration in the area. The magnetic and the regional gravity maps indicated the contact of Chakradharpur granite and metasediments of the Iron Ore Group which is indistinct on the surface.
Keywords
Gravity, Magnetic, Geophysics, Uranium, Singhbhum, Bihar.
- Interpretation of Aero-Magnetic Data and Satellite Imagery to Delineate Structure - A Case Study for Uranium Exploration from Gwalior Basin, India
Abstract Views :662 |
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad – 500 629, IN
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad – 500 629, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 382-392Abstract
The Paleo-Meso Proterozoic Gwalior basin (E - W), lying to NW fringe of Bundelkhand massif is represented by litho-package of lower arenaceous Par Formation and upper chemogenic Morar Formation. It is bounded by Indo- Gangetic alluvium in north and east, Kaimur sediments in west and Bundelkhand granitoids in south. Gwalior Basin has been the exploration target for uranium mineralization right from early 60's. Surface radioactivity anomalies due to uranium has been reported in both Par and Morar Formations of Gwalior Group and Vindhyan sediments. Besides presence of syngenetic uranium in the system, presence of post-depositional faults and fractures are the favorable factors. Aeromagnetic survey was carried out by AMD in 2002 with N-S lines of 500 m interval covering 9406 line km. The data with sampling interval of 0.1 sec was corrected for spikes, diurnal variation, IGRF, heading and lag. Final processed images are prepared after suitable leveling and gridding. First vertical derivative of TMI-RTP and tilt-angle derivative images are used to map the litho-contacts, lineaments and structural features. Numerous NE-SW trending low amplitude and NW-SE trending high amplitude magnetic linears corroborate with quartz reefs and basic dykes respectively. Besides, E-W to WNW-ESE and ENE-WSW trending fractures are also evident from the processed image maps. Further, the Euler's depth solution of gridded aeromagnetic data calculated for structural indices of 0 and 1 are very consistent in locating the position of the causative sources. Based on the amplitude and textural character of processed aeromagnetic data, alteration zone is delineated well within the Morar Formation. Enhanced Thematic Mapper (ETM+) image with 30m resolution was merged with IRS PAN 1D (5.8 m resolution) for better spatial/radiometric resolution to extract lithocontacts and lineament patterns. Merged PAN band-4 after linear contrast and edge enhancement techniques deciphered detailed lineament pattern, which corroborate the magnetic data. Merged ETM+ (RGB 751) and PC (PC1-PC2-PC5) images depict litho-logical contrast. Integration of aeromagnetic and satellite imagery data helped in understanding the structural fabric of the Gwalior Basin and to identify favorable loci of uranium mineralization.Keywords
Gwalior Basin, Aeromagnetic Survey, Satellite Imagery, Structural Fabric.References
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