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      https://www.ias.ac.in/article/fulltext/jess/127/01/0009

    • Keywords

       

      Zanskar Himalaya; Late Quaternary glaciation; Indian summer monsoon; Westerlies.

    • Abstract

       

      The Suru, Doda and Zanskar river valleys in the semi-arid region of Southern Zanskar Ranges (SZR) preserve a rich repository of the glacial and fluvial landforms, alluvial fans, and lacustrine deposits. Based on detailed field observations, geomorphic mapping and limited optical ages, we suggest four glaciations of decreasing magnitude in the SZR. The oldest Southern Zanskar Glaciation Stage (SZS-4) is inferred from glacially polished bedrock and tillite pinnacles. The SZS-4 is ascribed to the Marine Isotopic Stage (MIS)-4/3. The subsequent SZS-3 is represented by obliterated and dissected moraines, and is assigned to MIS-2/Last Glacial Maximum. The multiple recessional moraines of SZS-2 glaciation are assigned the early to mid Holocene age whereas, the youngest SZS-1 moraines were deposited during the Little Ice Age. We suggest that during the SZS-2 glaciation, the Drang-Drung glacier shifted its course from Suru Valley (west) to the Doda Valley (east). The study area has preserved three generations of outwash gravel terraces, which broadly correlate with the phases of deglaciation associated with SZS-3, 2, and 1. The alluvial fan aggradation, lacustrine sedimentation, and loess deposition occurred during the mid-to-lateHolocene. We suggest that glaciation was driven by a combination of the mid-latitude westerlies and the Indian Summer Monsoon during periods of cooler temperature, while phases of deglaciation occurred during enhanced temperature.

    • Author Affiliations

       

      Shubhra Sharma1 2 Aadil Hussain2 3 Amit K Mishra3 4 5 Aasif Lone4 6 Tarun Solanki2 3 Mohammad Khatib Khan5 7

      1. Indian Institute of Science Education and Research Mohali, Mohali 140 306, India.
      2. Physical Research Laboratory, Ahmedabad 380 009, India.
      3. Institute of Seismological Research, Raisan Gandhinagar 382 007, India.
      4. Department of Geology, University of Lucknow, Lucknow 226 007, India.
      5. School of Earth Sciences, Banasthali Vidyapith, Rajasthan 304 022, India.
      6. Department of Geology, Anna University, Chennai 600 025, India.
      7. Department of Geology, Aligarh Muslim University, Aligarh 202 002, India.
    • Dates

       
  • Journal of Earth System Science | News

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