Application of Remote Sensing, Magnetic and VLF (EM) Techniques for Discovery of Lamproites near Ramadugu and Vattikod area, NW margin of the Cuddapah Basin, Eastern Dharwar Craton
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 9
Abstract
Semi detailed 2-D and (precision) geophysical surveys were carried out in the Ramadugu study areas of north western part of Cuddapah basin in Telangana State, India. Qualitative analysis of total magnetic components brought out geological contacts, seven faults (F1 to F7) and four tectonically disturbed zones (A, B, C & D), the surface morphology and structural configuration were obtained from Land Sat 8 ETM Satellite image of the Ramadugu study area of Nalgonda District (longitude 79°5 to 79°25and Latitudes 16°42 to 16°58), From observed surface correlation of reported lamproites occurrences, characterized by contact between dykes and granitic rocks, lineaments/faults peripherals of domal structures, circular to oval shaped structural features, which could have acted as potential sites for lamproites emplacement. After establishing the correlation between structure and lamproite occurrence, ten potential lamproites zones were delineated (2,3,4,5 6, 8,9,10,11 and 13) in the study region with domal features of morphology. Total magnetic, and VLF (EM) precision geophysical investigations (station interval 1m) have been carried out along the known lamproite fields at the Ramadugu (R1 to R5, Y1-Y2) and Vattikod (Gl-1, V1 to V10) lamproite fields, reveals the location of conductive and non conductive bodies, geological boundaries, lamproite dykes, faults/fractures and shear zones are located along contact between dykes and granitic rocks. The Fraser filtered data plots as well as KarousHjelt filter 2-D inversion current density pseudo sections for real and imaginary components has aided in refining the location of conductors, nature of conductivity, dip and the depth of these conductors. The VLF (EM) responses along all lamproite bodies along with the magnetic interpretation, are presented here as a case study.
Authors and Affiliations
Ramadass G, Dubba Vijay kumar, Sriramulu G
Keywords
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