International Journal For Multidisciplinary Research

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Unravelling the Diagenetic Evolution of Concretions in the Lower Barakar Sandstones, Pranhita Godavari Valley Basin, South India

Author(s) Ms. Neeti Mandal, Mr. P Manimaran
Country India
Abstract The Barakar Formation of the Pranhita–Godavari Basin, constituting a significant segment of the Indian Gondwana Supergroup, manifests an extensive development of diagenetic concretions that encapsulate intricate records of both early and late diagenetic transformations. Meticulous field-based documentation, supplemented by morphometric and statistical analyses, delineates the morphological heterogeneity, spatial disposition, and genetic complexity of these concretionary bodies. Predominantly confined in fine- to medium-grained arenaceous lithofacies, the concretions exhibit diverse morphotypes whose genesis is attributable to early diagenetic cementation under fluctuating physicochemical regimes governed by groundwater chemistry and the prevalence of organic nuclei. The concretions are characteristically more indurated, compact, and mineralogically stabilized than their host sandstones, conferring upon them a pronounced resistance to weathering and erosion. Their upward-protruding, relief-forming expressions serve as robust geological proxies for the reconstruction of paleo-groundwater circulation, redox gradients, and post-sedimentary diagenetic trajectories. Morphometric datasets reveal a statistically dominant spectrum of small- to medium-sized concretions, with shape indices reflecting depositional asymmetry and micro-environmental redox variability. The observed morphogenetic diversity further implicates microbial mediation, differential cement supersaturation, compactional stresses, and fluid-migration pathways as principal controls dictating the evolution of distinct concretionary morphotypes within the Barakar sandstones.
Keywords Concretions, cementation, Diagenesis, Barakar Formation
Field Biology > Geology
Published In Volume 7, Issue 5, September-October 2025
Published On 2025-10-25
DOI https://doi.org/10.36948/ijfmr.2025.v07i05.58915

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