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<p>We report for the first time the stratigraphy of the Proterozoic siliciclastic–carbonate succession (~ 1800&#xa0;m thick) exposed between south of Dhaba and north of Pomburna in Central India, which represents the northern segment of the Eastern Belt of the Pranhita–Godavari (PG) Valley adjoining the Western Bastar Craton. Detailed field geology, petrography, and stratigraphic principles support the subdivision of this succession into four lithostratigraphic units of formational rank, correlated respectively with the Somnur, Tarur Nala, Bodelavagu, and Po Gutta Formations of the Somanpalli Group in the Eastern Belt. The lower part comprises deformed mixed siliciclastics and carbonates capped by a thin stromatolite-bearing dolomitic limestone. The middle section consists of heterolithic limestone interbedded with lime-clast conglomerates, while the upper part is dominated by quartz arenite. These Proterozoic sediments rest unconformably on an Archean granitoid basement and are overlain by Mesozoic Gondwana strata along faulted contacts. The Dhaba-Pomburna sector provides crucial new stratigraphic information for the relatively underexplored Eastern Belt of the PG Valley, refining the regional lithostratigraphic framework and contributing to the understanding of basin evolution. The revised stratigraphy enhances interpretations of depositional processes, intracratonic basin development, and the tectonic significance of the PG basin in the context of supercontinent cycles from Columbia to Gondwana.</p>

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New lithostratigraphic architecture and depositional dynamics of the Dhaba-Pomburna sector, Eastern Pranahita-Godavari Basin, Central India: its geological significance

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Nathala Kutumba Rao,
  • Muduru Lachhana Dora,
  • Manish Desmukh,
  • Kirtikumar Randive,
  • Srinivasa Rao Baswani,
  • Valiveti Venkata Sesha Sai,
  • Tushar Meshram

摘要

We report for the first time the stratigraphy of the Proterozoic siliciclastic–carbonate succession (~ 1800 m thick) exposed between south of Dhaba and north of Pomburna in Central India, which represents the northern segment of the Eastern Belt of the Pranhita–Godavari (PG) Valley adjoining the Western Bastar Craton. Detailed field geology, petrography, and stratigraphic principles support the subdivision of this succession into four lithostratigraphic units of formational rank, correlated respectively with the Somnur, Tarur Nala, Bodelavagu, and Po Gutta Formations of the Somanpalli Group in the Eastern Belt. The lower part comprises deformed mixed siliciclastics and carbonates capped by a thin stromatolite-bearing dolomitic limestone. The middle section consists of heterolithic limestone interbedded with lime-clast conglomerates, while the upper part is dominated by quartz arenite. These Proterozoic sediments rest unconformably on an Archean granitoid basement and are overlain by Mesozoic Gondwana strata along faulted contacts. The Dhaba-Pomburna sector provides crucial new stratigraphic information for the relatively underexplored Eastern Belt of the PG Valley, refining the regional lithostratigraphic framework and contributing to the understanding of basin evolution. The revised stratigraphy enhances interpretations of depositional processes, intracratonic basin development, and the tectonic significance of the PG basin in the context of supercontinent cycles from Columbia to Gondwana.