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Interpretation of Aero-Magnetic Data and Satellite Imagery to Delineate Structure - A Case Study for Uranium Exploration from Gwalior Basin, India
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.
Gwalior Basin, Aeromagnetic Survey, Satellite Imagery, Structural Fabric.
- ABSAR, N., RAZA, M., ROY, M., NAQVI, S.M. and ROY, A.K. (2009) Composition and weathering conditions of Paleoproterozoic upper crust of Bundelkhand craton, Central India: Records from geochemistry of clastic sediments of 1.9 Ga Gwalior Group. Precambrian Res., v.168, pp.313-329.
- BARANOV, V. and NAUDY, H. (1964) Numerical calculation of the formula of reduction to the pole. Geophysics, v.29, pp.67-79
- BASU, A.K. (1986) Geology of the Bundelkhand Granite massif, Central India. Rec. Geol. Surv. India, v.117, no.2, pp.61-124.
- BASU, A.K. (2007) Role of the Bundelkhand Granite Massif and the son-Narmada Megafault in the Precambrian Crustal evolution and Tectonism in Central and Western India. Jour. Geol. Soc. India, v.70, no.5, pp.754-770.
- BERHE, S.M. and ROTHERY, D.A. (1986) Interactive processing of satellite images for structural and lithologic mapping in northeast Africa. Geol. Mag., v.123, pp.393- 403.
- CRAWFORD, A.R. (1970) The Precambrian geochronology of Rajasthan and Bundelkhand, northern India. Can. Jour. Earth Sci., v.7, pp.91-110.
- GHOSH, D. and RAMESH ACHARYA, G. (2006) Structural features of Bondelkhand Granite Complex delineated by aeromagnetic expression around Jhansi, Uttar Pradesh. Jour. Geol. Soc. India, v.68, pp.1008-1022.
- KAVAK, K.S. and CETIN, H. (2007) A detailed geologic lineament analysis using Landsat TM data of Golmarmara/Manisa region, Turkey. Online Jour. Earth Sci., v.1, no.3, pp.145-153.
- MALLIKHARJUNA RAO, J., POORNACHANDRA RAO, G.V.S., WIDDOWSON, M. and KELLY, S.P. (2005) Evolution of Proterozoic mafic dyke swarms of the Bundelkhand granite massif, Central India. Curr. Sci., v.88, pp.502-506.
- MAUS, S. and MACMILLAN, S. (2005) 10th generation International Geomagnetic Reference Field. EOS Trans. Amer Geophys Union, v.86, 159p.
- MILLER, H.G. and SINGH, V. (1994) Potential field tilt; a new concept for location of potential field sources. Jour. Appld. Geophys., v.32, pp.213-217.
- MILLIGAN, P.R. (1995) Short-period geomagnetic variations recorded concurrently with an aeromagnetic survey across the Bendigo aera, Victoria. Exploration Geophysics, v.26, pp.527-534.
- MINTY, B.R.S. (1991) Sinple micro-levelling for aero-magnetic data. Exploration Geophys., v.22, pp.591-592.
- MONDAL, M.E.A. and ZAINUDDIN, S.A. (1996) Evolution of the Archaean-Palaeoproterozoic Bundelkhand massif, Central India – evidence from granitoid geochemistry. Terra Nova, v.8, pp.532-539.
- MONDAL, M.E.A., GOSWAMI, J.N., DEOMURARI, M.P. and SHARMA, K.K. (2002) Ion microprobe 207Pb/206Pb ages of zircons from the Bundelkhand massif, northern India: implications for crustal evolution of the Bundelkhand-Aravalli protocontinent. Precambrian Res., v.117, pp.85-100.
- NABIGHIAN, M.N. (1984) Toward a three-dimensional automatic interpretation of potential field data via Hilbert transforms – Fundamental relations. Geophysics, v.49, pp.780-786.
- RAJU, B.V.S.N., KUMAR, A., GOSWAMI, A., CHATURVEDI, A.K. and SHANTI KUMAR, C. (2007) Delineation of uranium potential zones in Gwalior Basin, India using multi-sensor data sets. Jour. Geophysics, v.XXVII, no.3&4, pp.105-110.
- REEVES, C.V. (1993) Limitations imposed by geomagnetic variations on high quality aero-magnetic surveys. Exploration Geophys., v.24, pp.115-116.
- REID, A.B., ALLSOP, J.M., GRANSER, H., MILLET, A.J. and SOMERTON, I.W. (1990) Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics, v.55, pp.80-91.
- SHARMA, R.P. (1982) Lithostratigraphy, structure and petrology of the Bundelkhand Group. In: K.S. Valdiya, S.S.S. Bhatia and V.K. Gaur (Eds.), Geology of Vindhyachal. Hindustan Publ. Corp., Delhi, pp.30-46.
- SHARMA, R., MURTHY, CH. V.V.S., GOUDA, H.C. and SINGH, R.K. (2006) Analysis of Aeromagnetic data over parts of Bundelkhand Granite Complex for Geology and structure. Jour. Geol. Soc. India, v.68, pp.949-958.
- SHRIVASTAVA, M.P. and SHRIVASTAVA, S.K. (1989) Geology and search for phosphorite in Gwalior basin of Madhya Pradesh. Rec. Geol. Surv. India, v.122, no.6, pp.1-2.
- THOMPSON, D.T. (1982) EULDPH: A new technique for making computer assisted depth estimates from magnetic data. Geophysics, v.47, pp.31-37.
- VANI, K., SHANMUGAVEL, S. and MARRUTHACHALAM, M. (2001) Fusion of IRS-LISS III and PAN images using different resolution ratios. Paper presented at the 22nd Asian Conference on Remote Sensing, 5-9 Nov 2001, Singapore.
- WALD, L., RACHIN and MAGOLINI, M. (1997) Fusion of satellite images of Different Spatial Resolutions: Assessing the quality of resulting images. Photogrammetric Engineering & Remote Sensing, v.63, no.6, pp.691-699.
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