DST-sponsored field workshop

摘要

A DST-sponsored field workshop on 'Deformation style in the Great Boundary Fault around Chittaurgarh, Rajast-han', was held on 26 and 27 January 2013, with the participation of research students and faculty members from different academic institutionsin the country. The field trip was led by D. C. Srivastava (IIT Roorkee), in which the participants could identify and interpret mesoscopic planar and linear structures in Great Boundary Fault. The Great Boundary Fault as a major tectonic lineament withNE extension for about 400 km has a great tectonic importance in the geology of Rajasthan as it separates the Meso- to Neoproterozoic Vindhyan sedimentary rocks from the Late Archean (2500 Ma) Berach Granite and the low-grade metamorphic Palaeo-proterozoic volcano-sedimentary rocks of Hindoli Group (earlier assigned to Aravalli System by Heron in 1953). Some geologists consider the Great Boundary Fault to be of pre-Vindhyan in age. The kinematic indicators/structures observed in greater detail in threesections in the vicinity of Chittaurgarh, revealed that Vindhyan rocks were subject to brittle and brittle-ductile shear during the transpressional deformation along the Great Boundary Fault, implying that the Great Boundary Fault, even if it constituted the Vindhyan basin boundary, must have been reactivated after the basin was filled and uplifted.