Abstract
The Deccan Volcanic Province (DVP), which is one of the largest flood basalt regions in the world, together with Dharwar Craton constitutes a large portion of the Precambrian South Indian shield. To understand the evolutionary nature of the DVP, we determine the lithosphere structure across the DVP–Eastern Dharwar Craton (EDC), using seismological waveforms recorded at 18 seismological stations. We use joint modelling of teleseismic receiver functions and surface wave dispersion data as well as teleseismic relative residuals. The calculated thickness of the lithosphere shows a significant difference between the DVP and EDC; it is ~50–60 km thinner in the DVP compared to that in the EDC. Through interrelation of these results with available data, we find that the DVP may have an intimate relationship with the break-up of the Gondwanaland.
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Acknowledgements
We are thankful to the team members of seismological field in the study region. The study was performed under CSIR projects INDEX (PSC-0204) and MLP-6401-28 (PM). Dr Gokul Saha provided figure 5(c) from their study. SG acknowledges exhaustive discussions with Drs M Ram Mohan and V Pavan Kumar. SG is grateful to Prof N V Chalapathi Rao for inviting us to contribute to this special volume. We are sincerely indebted to two reviewers for their very exhaustive reviews. Both the reviewers provided critical and useful comments, which improved the quality of the manuscript. The CSIR-NGRI reference number of the manuscript is NGRI/LIB/2021/Pub-113.
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SG: Conceptualisation, visualisation, funding acquisition, supervision, project administration, data curation, software, validation, writing – original draft, review and editing. SK: Formal analysis, validation, methodology, software, writing – review and editing.
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Communicated by N V Chalapathi Rao
This article is part of the Topical Collection: Deccan Traps and other Flood Basalt Provinces – Recent Research Trends.
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Gupta, S., Kumar, S. Lithosphere thickness variation across the Deccan Volcanic Province–Eastern Dharwar Craton, South India: Insight into evolution of the Deccan Volcanic Province. J Earth Syst Sci 131, 10 (2022). https://doi.org/10.1007/s12040-021-01748-2
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DOI: https://doi.org/10.1007/s12040-021-01748-2