Mylonitic microfabrics from the rocks of MCT zone in Alakhnanda valley,Garhwal Himalaya |
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| Authors: | H B Srivastava Vaibhava Srivastava |
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| Institution: | 1.Department of Geology,Banaras Hindu University,Varanasi,India |
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| Abstract: | MCT Zone of Alakhnanda valley is a major ductile shear zone in Garhwal Himalaya, which is characterised by different types
of mylonite rocks. On the basis of grain size and the percentage of matrix in the rock, zones comprising protomylonite, augen
mylonite, mylonite and ultramylonite have been identified. The study of microstructures, grain size and crystallographic preferred
orientation of quartz c-axis fabric reveals that the rocks of the MCT zone were deformed by a combination of intracrystalline creep (power law creep)
and grain boundary migration (sliding super plasticity). |
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