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      https://www.ias.ac.in/article/fulltext/jess/130/0192

    • Keywords

       

      Paleostress inversion; Fracture analysis; Main Boundary Thrust; Northwest Himalaya.

    • Abstract

       

      Fractures are the prominent deformation-induced structural features that develop in the rocks under brittle regime. Establishing a relationship between structural development and paleostress orientations is thus necessary to propose the comprehensive tectonic models of the study area. The study area lies in Lesser Himalaya (LH), which is restricted by the Main Central Thrust (MCT) in the north while the Main Boundary Thrust (MBT) lies south of it. This study aims to analyze the fracture pattern in the rocks along the Main Boundary Thrust (MBT, NW Himalaya, Pakistan) and perform paleostress analysis. Fifty different circle inventories were drawn in the Beld and 550 individual fracture orientations were observed and recorded. The data obtained includes orientation (dip amount, direction and strike) of fracture planes, density in terms of abundance within the definite area and fracture Blling material within the circle. The fracture data is then interpreted through Win-Tensor program for paleostress inversion. It is a computer interactive program based on Right Dihedron Method for fracture analysis and paleostress reconstruction. The results demonstrate a compressive tectonic regime with ${\sim}$NNW–SSE trending ${\sigma}_1$. It is suggested that the Main Boundary Thrust (MBT) is developed almost perpendicular to maximum principal stress orientation.

    • Author Affiliations

       

      NAVEED AHSAN1 HASSAN MEHMOOD1 MUHAMMAD ARMAGHAN FAISAL MIRAJ1 IQRA BANO1 ABDUL QAYYUM2 RANA FAIZAN SALEEM1

      1. Institute of Geology, University of the Punjab, Quaid-i-Azam Campus, Lahore 54590, Pakistan.
      2. Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, University of Utrecht, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands.
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    • Supplementary Material

       
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