Development of transverse fault along North Almora Thrust, Kumaun Lesser Himalaya, India: A study based on field and magnetic fabrics

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• 作者：P. D. Pant (1)
  Ritu Chauhan (1) chauhanreetu@gmail.com
  S. S. Bhakuni (2)
• 关键词：Almora Nappe – ; North Almora Thrust – ; Chaukhutiya Fault – ; Anisotropy of Magnetic Susceptibility
• 刊名：Journal of the Geological Society of India
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：79
• 期：5
• 页码：429-448
• 全文大小：2.4 MB
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• 作者单位：1. Department of Geology, Kumaun University, Nainital, 263 002 Uttarakhand, India2. Wadia Institute of Himalayan Geology, Dehradun, 248 001 Uttarakhand, India
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geology
  Geosciences
  Geography
  Mineralogy
  
• 出版者：Springer India, co-published with Geological Society of India
• ISSN：0974-6889

文摘

Along the North Almora Thrust (NAT) in the Kumaun Lesser Himalaya, a zone of mylonitic rocks has developed due to strain localization during the tectonic emplacement of the Almora Nappe over the Lesser Himalayan Sequence. This zone is referred here as the NAT zone (NATZ) that is dissected by faults, which are transverse to the Himalayan orographic trend and are known as seismically active structures. Trending NNW-SSE these are the Chaukhutiya and Raintoli faults. Two E-W oriented subsidiary brittle faults across the Chaukhutiya Fault are also recognized. Based on the field study and magnetic fabric analysis an attempt has been made to evaluate the deformation and kinematic history of northeastern margin of the Almora Nappe superposed by the Chaukhutiya faulting that coincides with northeastern margin of the NAT. Field study reveals brittle-ductile and brittle regimes of deformation along the Chaukhutiya Fault. Away from the NAT variable attitudes (E-W or ENE-WSW with gentle dip) of field foliation and axial planes of folds are observed, whereas at and near the NAT the attitudes of beds, including curved lithounits, are steeply dipping and are oriented parallel with the NNW-SSE trending NAT. Curvature in fold hinge line and discontinuous occurrence of lithounits are observed along the fault.