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      https://www.ias.ac.in/article/fulltext/jess/127/02/0029

    • Keywords

       

      Fluvio-marine; estuary; post-glacial transgression; sequence stratigraphy; Permian; Gondwana.

    • Abstract

       

      The present research is an attempt to assess the Barakar Formation of the Raniganj Gondwana Basin, India, in the frame of fluvio-marine (estuarine) depositional systems using sequence stratigraphic elements. Analysis of predominant facies associations signify deposition in three sub-environments: (i) ariver-dominated bay-head delta zone in the inner estuary, with transition from braided fluvial channels (FA-B1) to tide-affected meandering fluvial channels and flood plains (FA-B2) in the basal part of the succession; (ii) a mixed energy central basin zone, which consists of transitional fluvio-tidal channels (FA-B2), tidal flats, associated with tidal channels and bars (FA-B3) in the middle-upper part ofthe succession; and (iii) a wave-dominated outer estuary (coastal) zone (FA-B4 with FA-B3) in the upper part of the succession. Stacked progradational (P1, P2)–retrogradational (R1, R2) successions attest to one major base level fluctuation, leading to distinct transgressive–regressive (T–R) cycles with development of initial falling stage systems tract (FSST), followed by lowstand systems tract (LST)and successive transgressive systems tracts (TST-1 and TST-2). Shift in the depositional regime from regressive to transgressive estuarine system in the early Permian Barakar Formation is attributed to change in accommodation space caused by mutual interactions of (i) base level fluctuations in responseto climatic amelioration and (ii) basinal tectonisms (exhumation/sagging) related to post-glacial isostatic adjustments in the riftogenic Gondwana basins.

    • Author Affiliations

       

      Biplab Bhattacharya1 Joyeeta Bhattacharjee1 Sandip Bandyopadhyay2 Sudipto Banerjee2 3 Kalyan Adhikari3

      1. Department of Earth Sciences, Indian Institute of Technology, Roorkee 247 667, India.
      2. Department of Geology, Hooghly Mohsin College, Chinsurah, Hooghly 712 101, India.
      3. Department of Earth and Environmental Studies, National Institute of Technology, Durgapur 713 209, India.
    • Dates

       
  • Journal of Earth System Science | News

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