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Vedanti, Nimisha
- Gravity and Magnetic Studies Over the Circular Geomorphic Crater Looking Structures in the Narmada Traps, Central India
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Authors
Affiliations
1 Fractals in Geophysics Group, National Geophysical Research Institute, Uppal Road, Hyderabad - 500007, IN
1 Fractals in Geophysics Group, National Geophysical Research Institute, Uppal Road, Hyderabad - 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 1 (2004), Pagination: 97-101Abstract
Gravity and total field magnetic intensity data have been collected over three adjacent circular geomorphic features near Jabalpur, presently reported as volcanic vents in the Deccan volcanic province. Bouguer anomaly variation of the order of 1.2 to 2 mGal in a 1.5 km long profile, and total field magnetic anomaly of the order of -900 to 1400 nT have been observed. The gravity variation does not give any reflection of underlying deep seated high density material; and there are no isolated or elliptical magnetic anomalies that can be attributed to the presence of deep seated anomalous source like a volcanic vent. The basement depth values as determined by Werner deconvolution technique corresponding to the three circular geomorphic features is 51.7, 57.6 and 75 m.Full Text
- Detailed Gravity Studies over Jabera - Damoh Region of the Vindhyan Basin (Central India) and Crustal Evolution
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Authors
Affiliations
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 5 (2009), Pagination: 715-723Abstract
Vindhyan Basin of Central India situated just north of SONATA rift zone, forms one of the major geotectonic segment of the Indian subcontinent which is associated with complex thermo-tectonic history. Southern part of this basin is known to contain favorable conditions for hydrocarbon entrapment. Keeping this in view, a detailed gravity survey network comprising 40 gravity bases and 1500 data points in an area of about 110 × 100 km2 was planned in and around Jabera-Damoh region. Analysis of Bouguer and free air gravity anomaly maps, prepared using fractal based gridding method, indicates presence of two sedimentary basins (Jabera and Damoh) faulted on either sides beside ridge like features. However, well-known Jabera domal structure appeared to be a shallow feature only. Inversion of gravity data further reveals presence of 5 to 6 km thick Vindhyan sediments in the Jabera basin which are underlain by Mahakoshal/ Bijawar group of rocks, resting directly over the lower crust, thereby indicating almost total absence of granitic crust from this region. It appears that due to an underlying thermal anomaly, the entire region may have been subjected to sustained uplift, deformation, erosion and consequent crustal extension during early to mid Proterozoics which brought high velocity mafic crust to such shallow levels.Keywords
Gravity Studies, Crustal Evolution, Lower Crust, Fractals, Gravity Data Inversion, Vindhyan Basin.
References
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