Structural appraisal of the Gadag schist belt from gravity investigations

Tectonic Classification of Dharwar Craton, INDIA.BASED on Inversion of Regional Bouguer Gravity.

“…Results of radiometric studies in the western and central parts of the transect (Himabindu and Ramadass, 2003) have also corroborated inferences drawn from gravity studies.…”

“…After all corrections applied to data and it was concentrated in filing the gap and merging 2180 new observations with 10,000 existing Udipi-Kavali transect data from NGRI (Singh et al, 2003(Singh et al, , 2004 and GSI (Keshawamani, 1996(Keshawamani, , 1999Appa Rao, 1995), Central of Exploration Geophysics (Ramadass et al, 2003(Ramadass et al, , 2006 shown in Figure.1 . In fact, a further increase in the density and accuracy of observations might provide more information about the structure of the Craton.…”

“…The Part of the Bouguer gravity map of India Shield (Singh et al, 2003(Singh et al, ,2004Keshawamani, 1996Keshawamani, , 1999Appa Rao, 1995;Ramadass et al, 2003Ramadass et al, , 2006Mishra, 2011), on 1:100,000 scale is presented in Fig 2, between longitude 73°30' E to 78° 30' E and latitude 12°N to 17°N. Interpretation of the Bouguer gravity data of South India correlating all the geologically provinces has been carried out by many workers, in particular Subrahmanyam (1978), New gravity investigations were carried out between the 73° 30' E -78° 30'E Longitudes and 12° N-17°N Latitudes in the Dharawarcraton from qualitative analysis (Bouguer gravity) several faults/lineaments are determined ( Bhagya and Ramadass.…”

Control of pre-existing fabric in fracture formation, reactivation and vein emplacement under variable fluid pressure conditions: An example from Archean Greenstone belt, India

“…Structural investigations suggest that the Chitradurga region was subjected to three deformational events-D1, D2 and D3 respectively. D1 and D2 were found to be coaxial and controlled by NE-SW shortening that led to the development of folds (NW-SE striking vertical axial plane), while D3 was controlled by NW-SE to E-W shortening, resulting in the development of NE-SW striking planar structures (Chakrabarti et al, 2006;Ramadass et al, 2003). The superposition of D3 over D1/D2 formed culmination and depression in the region (dome-basin structures; Type-I interference pattern) (Chakrabarti et al, 2006).Therefore, it is logical to infer that the magnetic fabric in metabasalts are also related to the regional D1/D2 deformation under NE-SW directed shortening that generated the field foliation in the meta-sedimentary sequences.…”