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Veeraiah, B.
- Gravity Investigations for Structural Mapping in the Makthal Region, Andhra Pradesh
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Authors
Affiliations
1 Center of Exploration Geophysics, Osmania University, Hyderabad - 500 007, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 Center of Exploration Geophysics, Osmania University, Hyderabad - 500 007, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 3 (2005), Pagination: 345-353Abstract
Semi-Detailed gravity surveys were carried out over an area of approximately 1500 Sq km in and around Makthal(Mahboobnagar district, Andhra Pradesh) in the eastern Dharwar craton to evaluate the structural configuration of the region. Two major, linear deep-Seated faults, one running NW-SE and the other N-S, and several other lineaments were identified from the qualitative analysis of the Bouguer gravity data. The zones of intersection of these structural trends which could have acted as potential sites for kimberlite emplacement, were accordingly delineated.
The near surface as well as deep crustal configuration in the region was obtained via the inversion of a NE-SW trending gravity profile obtained by digitizing the Bouguer gravity contour map. From the disposition of the crustal layers, a total of five faults were inferred, revealing the structural configuration of the region. These faults were found to correlate well with faults/Lineaments inferred from qualitative analysis.
Keywords
Gravity Surveys, Structural Configuration, Kimberlite Emplacement, Eastern Dharwar Craton, Makthal, Andhra Pradesh.
- Thinning of Granitic-Gneissic Crust below Uplifting Hyderabad Granitic Region of the Eastern Dharwar Craton (South Indian Shield): Evidence from AMT/CSAMT Experiment
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Authors
Affiliations
1 National Geophysical Research Institute, (Council of Scientific & Industrial Research), Uppal Road, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, (Council of Scientific & Industrial Research), Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 6 (2009), Pagination: 697-702Abstract
Hyderabad granitic region (HGR) forms one of the most unusual geotectonic segment of the south Indian shield. Analysis of multiparametric geological, geophysical and IGS-GPS studies have earlier suggested that this region is neotectonically uplifting at a rapid rate. We propose that consequent to such uplift, only a thin veneer of surface granitic layer now remains. In order to quantitatively examine the thickness of highly resistive granitic-gneissic crust below HGR, a audio-magnetotelluric (AMT)/controlled source AMT (CSAMT) experiment was conducted at three separate locations, situated about 50 km east of Hyderabad. The study reveals a maximum thickness of 5.5 to 6.0 km for the granitic - gneissic crust beneath HGR, which is underlain by thick low resistive exhumed intermediate (granulitic ?) crust. This finding is in sharp contrast to that of a thick granitic-gneissic crust (15-20 km) usually found in comparable late Archaean terrains elsewhere.Keywords
Hyderabad Granitic Region, Audio-Magnetotellurics, Uplift, Resistive Crust, Granitic-Gneiss, Granulites, Crustal Velocity, Dharwar Craton.References
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- A Subsurface Criterion for Predictive Exploration of Kimberlites from Bouguer Gravity in the Eastern Dharwar Craton, India
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Authors
Affiliations
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 69-77Abstract
The Archaean-Proterozoic Dharwar craton has many recorded occurrences of diamondiferous kimberlites. Reports of kimberlite emplacement in parts of the tectonically complex eastern Dharwar craton and a significant density contrast between kimberlites and the host peninsular gneisses motivated us to conduct gravity studies in the Narayanpet-Irladinne area of the eastern Dharwar craton. This region is contiguous with the Maddur-Narayanpet kimberlite that lies to its north, while the river Krishna lies to its south.
From observed association of reported kimberlites in the Maddur-Narayanpet field with subsurface topography of the assumed three-layer earth section obtained by Bouguer gravity modelling, we developed a subsurface criterion for occurrence of kimberlites in the present study area. Using this criterion, five potential zones for kimberlite localization were identified in the Narayanpet-Irladinne region, eastern Dharwar craton.
Keywords
Bouguer Gravity, Subsurface Topography, Kimberlite Emplacement, Dharwar Craton, Karnataka.References
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