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Gravity–magnetic appraisal at the interface of Cuddapah Basin and Nellore Schist Belt (NSB) for shallow crustal architecture and tectonic settings

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Abstract

Cuddapah Basin (CB) is an intracontinental, Proterozoic basin flanked by Eastern Dharwar Craton (EDC) in the west, Nellore Schist Belt (NSB) and Eastern Ghat Mobile Belt (EGMB) in the east, represents second largest Proterozoic basin of India. Gravity and magnetic surveys were carried out at the interface of Cuddapah Basin (CB) and Nellore Schist Belt (NSB) covering ~2880 km2 area. Gravity map has brought out some distinct zones. The thrusted contact of NSB and Cuddapah sediments has been well delineated from the gravity map by NE–SW trending steep gradient of contours. Relatively high gravity values are observed over NSB in the southeastern part, moderately high values are observed over Cumbum Formation, but distinct low is observed over Baironkonda Formation. These gravity highs and lows are mainly the manifestation of basement characteristics and intrusives. The magnetic map shows two distinct domains, viz., moderate to low zone in the southern part, and moderate to high zone in the northern part. Regional gravity map suggests a change in basement characteristics from felsic to mafic from NW to SE. Presence of mafic basement may be representing EGMB group of rocks underneath the Cuddapah sediments at the eastern part of the study area. The joint gravity and magnetic modelling reveal varied nature of sedimentary units in terms of density and susceptibility and change in basement characteristic.

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Acknowledgements

Authors are sincerely thankful to Prof M Radhakrishna, Associate Editor and the anonymous reviewers for their valuable suggestions. Authors are also thankful to the Director General, Geological Survey of India, for encouragement and providing the permission to publish the work. Likewise, authors thank the Director, IIT(ISM), Dhanbad and the Head, Dept. of App. Geophysics, IIT(ISM), Dhanbad for their keen interest in this study. Views and opinions expressed in this article are those of the authors and do not necessarily reflect the views/opinions of the organisation they belong to. SKP is thankful to ISRO, Dept. of Space, Govt. of India for funding RESPOND Project ISRO/RES/630/2016-17 and DST, SERB for FIST Project No. SR/FST/ES-1/2017/12.

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Authors and Affiliations

  1. Geological Survey of India, Hyderabad, 500 068, India

    Shuva Shankha Ganguli, J V Rama Rao & B Sunder Raj

  2. Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826 004, India

    Sanjit Kumar Pal

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  1. Shuva Shankha Ganguli
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Correspondence to Sanjit Kumar Pal.

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Communicated by Munukutla Radhakrishna

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Ganguli, S.S., Pal, S.K., Rama Rao, J.V. et al. Gravity–magnetic appraisal at the interface of Cuddapah Basin and Nellore Schist Belt (NSB) for shallow crustal architecture and tectonic settings. J Earth Syst Sci 129, 92 (2020). https://doi.org/10.1007/s12040-020-1354-8

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