• Post-glacial landform evolution in the middle Satluj River valley, India: Implications towards understanding the climate tectonic interactions

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      https://www.ias.ac.in/article/fulltext/jess/125/03/0539-0558

    • Keywords

       

      Paleo-climate; late Quaternary; Indian summer monsoon; fluvial terraces; alluvial fan; debris flow; optical chronology

    • Abstract

       

      Late Quaternary landform evolution in monsoon-dominated middle Satluj valley is reconstructed using the fragmentary records of fluvial terraces, alluvial fans, debris flows, paleo-flood deposits, and epigenetic gorges. Based on detailed field mapping, alluvial stratigraphy, sedimentology and optical chronology, two phases of fluvial aggradations are identified. The older aggradation event dated between ∼13 and 11 ka (early-Holocene), occurred in the pre-existing topography carved by multiple events of erosion and incision. Climatically, the event corresponds to the post-glacial strengthened Indian summer monsoon (ISM). The younger aggradation event dated between ∼5 and 0.4 ka (mid- to late-Holocene), was duringthe declining phase of ISM. The terrain witnessed high magnitude floods during transitional climate (∼6.5–7 ka). The fluvial sedimentation was punctuated by short-lived debris flows and alluvial fans during the LGM (weak ISM), early to mid-Holocene transition climate and mid- to late-Holocene decliningISM. Based on the terrace morphology, an event of relatively enhanced surface uplift is inferred after late Holocene. The present study suggests that post-glacial landforms in the middle Satluj valley owe their genesis to the interplay between the climate variability and local/regional tectonic interactions.

    • Author Affiliations

       

      Shubhra Sharma1 2 S K Bartarya1 B S Marh2

      1. Wadia Institute of Himalayan Geology, Dehradun, India.
      2. Department of Geography, Himachal Pradesh University, Shimla, India.
    • Dates

       
  • Journal of Earth System Science | News

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