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A detailed gravity picture of Nallamalai Fold Belt–Nellore Schist Belt (NSB) of Eastern Dharwar Craton with marginal Eastern Ghats Mobile Belt in Krishna Region, South India with special reference to Late Archaean NSB evolution

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Abstract

The Krishna region of south India comprises Eastern Ghats Mobile Belt (EGMB), Nellore Schist Belt (NSB) of Eastern Dharwar Craton (EDC) margin and Nallamalai Fold Belt (NFB) including Cuddapah Basin (CB) from east to west. The gravity surveys are carried out across it, so as to delineate the different litho-tectonic belts and salient structural features. The gravity data is processed to generate regional, residual and derivative maps along with three 2D gravity models. Two major gravity highs over the EGMB and NSB and a wide gravity low across the NFB, along with a linear gravity low representing as Transitional Zone (TZ) between these two highs are delineated. Two curvilinear steep gravity gradients between the NFB-NSB and NSB-EGMB are differentiated as Cuddapah Eastern Margin Thrust and Eastern Ghats Boundary Thrust along with a low angle Malakondasatram Thrust in the central part. The NSB comprises Eastern (EA) and Western (WA) arms of coeval different environmental facies of foreland and back-arc setups. The EA with intense gravity high due to a high-density layer at a depth of ~10 km is evidenced from 2D gravity model. The thickness of high-density layer (EA) gradually decreases towards westerly and wedges out below the WA suggesting the entire NSB as a single Late Archaean segment. The major linear gravity high of covered eastern part in Kavali–Nellore–Gudur region indicates the southern continuation of EGMB. The occurrence of thin unconformable high-grade schists in two doubly plunging structures and as tectonic lenses, including a major E–W folded erosional remnants in the low-medium grade late Archaean NSB domain are found as eastern continuation of Mesoproterozoic upper Cuddapah extensions at the EGMB front. These erosional remnants are reflected as isolated residual gravity lows in the west and as residual highs in overall EA of NSB in the east. The isolated relative highs and lows within the major low zone of NFB are linked to differential basement configuration due to superposed effects with the N–S non-cylindrical fold.

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Acknowledgements

The authors place a deep sense of gratitude to the ADG & HOD of Southern Region, GSI, Hyderabad, for his encouragement, kind support and permission to publish this work. The constant support and encouragement of Shri J V Rama Rao, the then DDG, Geophysics Division, during the course of work is highly appreciated. The first author is thankful to S/Sri/Smt. P Divakar Reddy, S Bangaru Babu, S S Ganguli, Abhirup Chaudhuri, Anasuya Das and Faisan Ahmad, officers of the Geophysics Division for their inputs with critical discussions/suggestions, which have become mostly helpful in the preparation of this paper.

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B Ravi Kumar: Geophysical data generation, compilation and reprocessing and interpretation by incorporating the deep-crustal inferences derived from deep seismic and regional gravity data. M Burhanuddin: Conceptualizing the research work by integration of geological and geophysical data. G Udaya Laxmi: Interpretation of gravity data.

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Correspondence to B Ravi Kumar.

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Communicated by Munukutla Radhakrishna

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Kumar, B.R., Burhanuddin, M. & Laxmi, G.U. A detailed gravity picture of Nallamalai Fold Belt–Nellore Schist Belt (NSB) of Eastern Dharwar Craton with marginal Eastern Ghats Mobile Belt in Krishna Region, South India with special reference to Late Archaean NSB evolution. J Earth Syst Sci 132, 82 (2023). https://doi.org/10.1007/s12040-023-02096-z

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  • DOI: https://doi.org/10.1007/s12040-023-02096-z

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