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    • Reorientation of lineation in the Central Crystalline Zone, Munsiari–Milam area of the Kumaun Greater Himalaya

      A K Verma A R Bhattacharya

      Volume 124 Issue 2 March 2015 pp 449-458

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/124/02/0449-0458

    • Keywords

       

      Stretching lineation; ductile shear deformation; Greater Himalaya; Main Central Thrust.

    • Abstract

       

      During large scale ductile shear deformation, linear features of the rocks tend to be reoriented towards the direction of bulk shear. This is demonstrated in a crustal scale shear zone of the Himalaya, the Main Central Thrust (MCT), typically exposed in the Munsiari–Milam area of eastern Kumaun Greater Himalaya. Along the MCT, the crystalline rocks of the Greater Himalaya are thrust over the younger sedimentary belt of the Lesser Himalaya. In the study area, the scatter of lineation orientation in the vicinity of the MCT has been observed to drastically reduce within 27° in a zone of about 18 km (about 13 km in the crystalline rocks and about 5 km in the sedimentary rocks). Beyond this zone, the scatter is very high, up to 70° or more. The low scatter of lineation orientation around the MCT could be related to the strong ductile shear deformation associated with the movement along this thrust due to which the linear features got reoriented towards the direction of bulk shear. Away from this zone, ductile shearing had negligible or no effect on the rocks and, therefore, the scatter of lineation remains very high.

    • Author Affiliations

       

      A K Verma1 A R Bhattacharya1

      1. Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India.

    • Dates

       
      Published
      March 2015
      Manuscript received
      18 March 2014
      Manuscript revised
      11 September 2014
      Accepted
      20 September 2014

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