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Evolution of Neoproterozoic siliciclastic Kerur Formation in the light of sequence stratigraphic framework: Badami Basin, Karnataka, India

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Journal of Palaeogeography 2024年第4期13卷 706-737页

作者： Soumik Mukhopadhyay Nipun Ghosh Pradip Samanta Arunava Sen soumyadeep bose Department of Geological Sciences Jadavpur University Atomic Minerals Directorate for Exploration and Research Department of Geology University of North Bengal

Field-based sedimentology,state of the art facies analysis and sequence stratigraphic framework analysis have revealed the controls of local and global tectonics,basin-marginal slope,climate and changes in relative sea level （RSL） over the sedimentation pattern and evolution of a Neoproterozoic Kerur Formation within the Badami Group of Kaladgi Supergroup in *** entire succession shows three major cycles of *** study and fluvial architectural elemental analysis suggest considerable variations in depositional environments as well as palaeogeography.A transition from basin-margin alluvial cone deposits to braided system,initially with fluctuating ephemeral flows then to a steadier semi-perennial nature,is discernible within the 1stcycle,in response to decreasing depositional slope with rising water *** initial alluvial cone and braided ephemeral streams of high slope areas is designated as a product of low accommodation systems tract （LAST）,while the semi-perennial system with steadier flows,representing the axial river of the initial rift valley,appears to be a product of high-accommodation systems tract （HAST）.The 2ndcycle begins with a perennial and steady braided river system and grades upward to a shallow marine succession,comprising wave-dominated,well-sorted sandstone,with a granular transgressive lag at the ***,the bottommost fluvial interval of the 2ndcycle constitutes the lowstand systems tract （LST）.The marine succession represents deposits of outer shelf offshore to foreshore-beach settings and is composed of an initially deepening and fining upward transgressive systems tract （TST）,followed by a coarsening and shallowing upward highstand systems tract （HST） with a maximum marine flooding surface （MFS） in between,demarcated by a shale-rich condensed *** 3rdcycle,with its prograding alluvial fan and aggrading braided fluvial deposits and restricted occurrence,represents only the low accommodation systems tract（LAST） with

关键词： Neoproterozoic Kerur Formation Facies and architectural elemental analysis Palaeogeography Sequence stratigraphy Basin evolution

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