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Strain and Crystallographic Fabric in Mesoscopic Ductile Shear Zones of Garhwal Himalaya
Authors:Hari B Srivastava  Atul Sahai  Surya N Lal
Institution:1. Department of Geology, Banaras Hindu University, Varanasi-221 005, India;2. Pan-India Consultants Pvt. Ltd., Gurgaon-122 015, India;3. Department of Geology, Kumaun University, Nainital-263 002, India;1. Composite Materials Research Laboratory, Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260-4400, USA;2. Department of Industrial and Systems Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA;1. Synchrotron SOLEIL, L''Orme des Merisiers, Saint Aubin - BP 48, F-91192 Gif-sur-Yvette, France;2. Université Paris-Sud, F-91405 Orsay Cedex, France;3. Institut des Matériaux Jean Rouxel - UMR 6502, Université de Nantes, 2 rue de la Houssinière, F-44322 Nantes, France;4. Institute for Quantum Electronics, Physics Department, ETH Zurich, CH-8093 Zurich, Switzerland;5. Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay, France;6. Swiss Light Source, Paul Scherrer Institute, CH-5232, Villigen, Switzerland;1. Institute of Research and Development, Duy Tan University, Da Nang, Viet Nam;2. Department of Physics, University of Education, Hue University, Hue, Viet Nam;3. Department of Physics, Da Nang University of Education, Da Nang, Viet Nam;4. Department of Materials Science and Engineering, Le Quy Don Technical University, Ha Noi, Viet Nam
Abstract:The MCT Zone of Bhagirathi valley of Garhwal Himalaya is characterized by numerous mesoscopic ductile shear zones. These shear zones are developed in response to nearly NNE-SSW maximum horizontal compression and provide an opportunity to study the variation in strain and crystallographic fabrics within the ductile shear zones.The grain shape and orientation of quartz under microscope reflect that strain is higher in the center and it progressively decreases towards the shear zone boundary. The preferred orientation of quartz c-axes across the shear zone suggests that the single girdle of the quartz c-axes are probably first developed at the shear zone boundary and become prominent in the center of shear zone with increase in the intensity of deformation. The strong crystallographic preferred orientation normal to foliation suggests that the internal deformation of the quartz might have taken place by dislocation creep mechanism exhibiting a non-coaxial deformation history.
Keywords:Garhwal Himalaya  MCT Zone  ductile shear zone  strain analysis  crystallographic preferred orientation
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