Abstract Views :261 |
PDF Views:8
Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 4 (2000), Pagination: 367-380
Abstract
The terrane boundary between Eastern Ghats Mobile Belt and the Bastar Craton in Balangir and Kalahandi Districts of Orissa is distinctly marked by nearly two kilometer wide southeasterly dipping ductile shear zone, designated as the Lakhna shear zone. The shear zone has largely developed in the craton, but for a narrow width within the Fastern Ghats. It is dominated by quartzofcldspathic mylonites characterised by S-C fabric, asymmetric winged porphyroclasts, quartz ribbons and intragranuhr faults. These structures have been effectively utilized in deducing the sense of shear and evaluating the amount of strain. The results show thrusting of the Eastern Ghats over the Bastar Craton. The minimum amount of throw along the thrust has becn estimated to be around 2.5 to 4.7 km assuming a dominant simple shear deformation.
Keywords
Terrane Boundary, Lakhna Shear Zone, Strain Evaluation, Eastern Ghats Mobile Belt, Bastar Craton, Orissa.
