Mineral Exploration around Suriyamalai Batholith of Central Tamil Nadu, India; A Magnetic And Remote Sensing Approach
Magnetic and Remote Sensing techniques have been used to identify the structural controlled mineralisation Suryamalai Batholith of Central Tamil Nadu, India. Magnetic survey has been carried out systematically using Proton Precession Magnetometer over an area of 400 sqkm. International Geomagnetic Reference Field correction was applied to remove the earth’s regional field variations. After the processing, contour map, total magnetic intensity map, regional, residual, analytical signal, horizontal derivative, tilt derivative and reduction to equator maps were generated and interpreted. The magnetic values are ranging from -803nT to 613nT with the mean of 132nT. Total magnetic intensity map shows magnetic high in the north eastern part and circular to semi circular magnetic low in the southern side. To overcome the bipolar nature of total magnetic intensity reduction to equator has been carried out that shows significant magnetic gradient trending NE-SW direction. Magnetic breaks were generated using total magnetic intensity and contour map which are trending in the NE-SW and NW-SE directions. The causative source depth of shallow and deep features were estimated around 900m and 2500m respectively using Radially Averaged Power Spectrum and <500m to >2500m depth were estimated using Euler deconvolution. Landsat OLI FCC data has been used to extract lineament from which lineament density is derived. Lineament characterisation also carried out using Rose diagram indicates that majority of the lineaments are trending in the NE-SW direction. Integration of geological, geophysical and remote sensing parameters brought to light two significant zones such as zone 1 and zone 2 for mineral exploration. Ground validation proved presence of significant minerals like pyrite and radioactive minerals in the demarcated zones.
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