Ductile Shearing in Attur Shear Zone and its Relation with Moyar Shear Zone, South India |
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| Authors: | BK Bhadra |
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| Institution: | 1. Institute of Applied Geosciences, Karlsruhe Institute of Technology, Adenauerring 20a, 76131 Karlsruhe, Germany;2. Department of Earth Sciences, Geophysics, Uppsala University, Villav. 16, 752 36 Uppsala, Sweden |
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| Abstract: | In the eastern part of southern Peninsular India, the charnockitic hills of the Madras block are cut across by the E-W trending Attur shear zone (ASZ) which is characterised by a thick (1 to 1.5 km) phyllonite zone, showing intense mylonitisation due to ductile shearing. Steeply plunging (70°–80°) stretching lineation on steeply dipping mylonitic foliation within this zone indicates a relative vertical upliftment of the adjacent blocks. A dextral shearing event from west to east is envisaged from the kinematic analysis of shear sense indicators such as S-C fabric, asymmetric folds, asymmetric augens and asymmetric porphyroclasts. Simultaneous development of these features, related to vertical and horizontal movements may be explained by the mechanism of transpressional deformation. The Attur shear zone may be correlated with the Moyar shear zone based on distinct lithological and structural similarities. |
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| Keywords: | Ductile shearing kinematic indicators Attur shear zone Moyar shear zone South India |
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