Comprehensive sedimentological and sequence stratigraphic ‎characterization of the exposed Boka Bil Formation, Surma ‎Basin, Northeastern Bangladesh

  • Authors

    • Md. Abdur Rahman University of Rajshahi
    • Md. Shafiqul Alam Department of Geology and Mining, University of Rajshahi, Bangladesh

    Received date: December 19, 2024

    Accepted date: January 7, 2025

    Published date: January 30, 2025

    https://doi.org/10.14419/rg2kab65
  • Facies; Sequence Stratigraphy; Shelf; Sea Level Change; Tectonic

  • Abstract

    The Surma Basin, situated in northeastern Bangladesh along the northeastern margin of the ‎Indian subcontinent, is a region characterized by tectonic activity. This study investigates the ‎Miocene siliciclastic sedimentary succession exposed at the Hari River section in Lalakhal, ‎Jaintiapur, to explore its depositional environments and sequence stratigraphic architecture. ‎Field observations and sedimentological analysis reveal two primary facies associations within ‎the Boka Bil Formation: FA1 (tide-dominated environments) and FA2 (shelf environments). ‎FA1 includes three facies: Facies A (tidal channel deposits), Facies B (alternating sandstone and ‎mudstone representing overbank deposits), and Facies C (distal overbank deposits), which ‎together depict a lateral transition from tidal channel margins to spillover deposits. FA2 consists ‎of Facies SL1 (inner shelf deposits) and Facies SL2 (outer shelf deposits), representing deeper ‎marine environments. The Boka Bil Formation displays a retrogradational stacking pattern, with ‎a fining-upward sequence that transitions from shallow to deeper marine conditions. This ‎pattern is indicative of a transgressive systems tract, driven by rising sea levels. The deepening-‎upward facies succession highlights the dynamic interplay between tectonic forces and sea-level ‎changes in an active margin setting. These findings enhance our understanding of sedimentary ‎processes, paleoenvironmental evolution, and regional stratigraphy, providing valuable insights ‎for resource exploration in tectonically influenced basins‎.

    Author Biography

    • Md. Abdur Rahman, University of Rajshahi

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  • How to Cite

    Md. Abdur Rahman, & Md. Shafiqul Alam. (2025). Comprehensive sedimentological and sequence stratigraphic ‎characterization of the exposed Boka Bil Formation, Surma ‎Basin, Northeastern Bangladesh. International Journal of Advanced Geosciences, 13(1), 1-10. https://doi.org/10.14419/rg2kab65

    Received date: December 19, 2024

    Accepted date: January 7, 2025

    Published date: January 30, 2025