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Neoarchean (ca. 2746–2501 Ma) magmatism: Evidence from east coast dykes of northeastern Southern Granulite Terrain, India

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Abstract

We report new Sm–Nd whole rock-mineral isochron ages of 2514 ± 13 Ma (MSWD = 0.79) and 2651 ± 95 Ma (MSWD = 7.4) from two east coast dykes (ECD) of Southern Granulite Terrain (SGT), India. The ages from the representative mafic dyke samples correspond to the time of intrusion of ECD into the eastern part of SGT, indicating the presence of an older Archean crust in SGT near the Pondicherry coast. The Sm–Nd ages obtained from the present study, along with geochronological information from Singhbhum Craton, suggest a magmatic linkage between SGT (including southern Dharwar Craton) and Singhbhum Craton during the Neoarchean period. The older ages obtained from the mafic dykes of the present study are comparable with the Sm–Nd ages of older mafic dykes from Nuggihalli green stone belt of Western Dharwar Craton (WDC), Pb–Pb ages of mafic dykes from Singhbhum Craton of India and the U–Pb ages from Pilbara and Kaapvaal cartons. These comparisons unlock a clue to Neoarchean (2.8–2.5 Ga) paleogeographic reconstructions of Pilbara, Kaapvaal, Singhbhum cratons, northern SGT (including southern Dharwar Craton) and also provide an opportunity for wide windows of research to be undertaken considering the dykes from SGT.

Research highlights

  • Evidence of Neoarchean magmatism from East coast dykes near Pondicherry coast of Southern Granulite Terrain, India.

  • Sm–Nd ages of 2514 ± 13 and 2651 ± 95 Ma represent the time of intrusion of east coast dykes in Southern Granulite Terrain.

  • Isotope age indicates the presence of ~2.7 Ga older Archean crust near Pondicherry coast of Southern Granulite Terrain.

  • Geochronological studies reveal a magmatic linkage between Southern Granulite Terrain and Singhbhum craton.

  • The present study provides clues to the connection between Pilbara, Kaapvaal with SGT and Singhbhum cratons.

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Acknowledgements

This work has been carried out at the National Facility for Isotope Geosciences, Department of Earth Sciences, Pondicherry University, India. The thorough and thoughtful review by N V Chalapathi Rao and the anonymous reviewer is duly acknowledged. The authors acknowledge funding by the Department of Science and Technology, India. SKP and JKD thank Pondicherry University for the financial assistance. SKP thanks the Director, IIG, for his constant encouragement, and permission to publish this work. SKP also thanks Gautam Gupta, Head, KSKGRL; E Karthikeyan and D S M Pdah for their support.

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Authors and Affiliations

  1. K.S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Leelapur Road, Hanumanganj, 221 505, India

    Sujit K Pradhan

  2. Department of Earth Sciences, Pondicherry University, Puducherry, 605 014, India

    Sujit K Pradhan, Jitendra K Dash, S Balakrishnan & R Bhutani

  3. Department of Earth Sciences, Indian Institute of Technology, Kanpur, 208 016, India

    Jitendra K Dash

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Contributions

Sujit K Pradhan: Conceptualization, field study, geochronological data curation, writing – review and editing of the original draft manuscript. Jitendra K Dash: Conceptualization, field study, geochemical data curation, writing – review and editing. S Balakrishnan: Conceptualization, field study, supervision, writing – review and editing. R Bhutani: Conceptualization, field study, supervision, writing – review and editing.

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Communicated by N V Chalapathi Rao

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Pradhan, S.K., Dash, J.K., Balakrishnan, S. et al. Neoarchean (ca. 2746–2501 Ma) magmatism: Evidence from east coast dykes of northeastern Southern Granulite Terrain, India. J Earth Syst Sci 133, 91 (2024). https://doi.org/10.1007/s12040-024-02300-8

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