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Three-dimensional Moho depth model of the eastern Indian shield and its isostatic implications

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Abstract

The Singhbhum Craton, Singhbhum Mobile Belt along its northern, eastern, and western edges, and Chotanagpur Gneissic Complex farther north are all parts of the Precambrian eastern Indian shield. Modern isotope dates and associated geological evidence suggest that these crustal units may be one cratonic block that developed sequentially between 3.55 and 1.00 Ga. The region has always been the focus of numerous geoscientific studies due to its complex evolutionary history and abundant mineralisation. We used the terrestrial gravity data from the Gravity Map Series of India and the EGM2008 global gravity dataset in the Bay of Bengal to model the 3D Moho geometry of the eastern Indian shield and the adjoining Bay of Bengal by inverting the gravity data. The Bouguer gravity data were filtered at several levels before applying the Parker–Oldenburg iterative inversion procedure. The Moho depth measurement is then computed by presuming a constant density contrast. The effects of sediments were eliminated from gravity data by collecting thickness and density details of the sediment from a worldwide sedimentary thickness map CRUST1.0 and applying a correction comparable to the Bouguer correction that uses the density difference of 0.24 g/cm3. Spectral analysis is used to fix a reference depth level and the low-frequency range associated with Moho deflection in the Bouguer anomaly filtered for sedimentary overburden. We subsequently executed the gravity inversion of a basic two-layer structure having a constant density difference of 0.40 g/cm3 across the Moho fixed at an average depth of 35 km. The gravity inversion analysis shows that the Moho depth within the Bay of Bengal is between 18 and 24 km. In the continent, the Moho depth varies from 34 km near the coastline to 38 km towards the Singhbhum Craton and Chhotanagpur Gneiss Complex. In the northern portion of the region, the Moho depth increases to over 40 km underneath the convergence of the Mahanadi–Damodar Gondwana basins and the Ganga foreland basin.

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Acknowledgements

The authors thank the Director, CSIR-National Geophysical Research Institute, Hyderabad, for granting permission to publish this paper (Library reference id: NGRI/Lib/2022/Pub-28). We also thank the Editor and two anonymous reviewers for their critical comments and suggestions that have helped significantly to improve the quality of the manuscript. Financial support for the research work is provided through the SIMO project (MLP-FBR-0006), funded by CSIR, New Delhi and forms a part of the PhD thesis work of VCP. The work is financially supported by CSIR-SIMO program (MLP-FBR-0006).

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Authors and Affiliations

  1. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, India

    Vikash C Patel, Niraj Kumar, B Nageswara Rao & A P Singh

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India

    Vikash C Patel

  3. Geological Survey of India Western Region, Jaipur, 302 004, India

    Archana Jarial

Authors
  1. Vikash C Patel
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  2. Archana Jarial
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  3. Niraj Kumar
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  4. B Nageswara Rao
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  5. A P Singh
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Contributions

V C Patel: Data curation, formal analysis and preparation of the figures. A Jarial: Data processing and curation. Niraj Kumar: Draft writing and editing. B Nageswara Rao: Data collection and processing. A P Singh: Conceptualization, supervision and project administration.

Corresponding author

Correspondence to Niraj Kumar.

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Communicated by Somnath Dasgupta

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Patel, V.C., Jarial, A., Kumar, N. et al. Three-dimensional Moho depth model of the eastern Indian shield and its isostatic implications. J Earth Syst Sci 132, 69 (2023). https://doi.org/10.1007/s12040-023-02081-6

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  • DOI: https://doi.org/10.1007/s12040-023-02081-6

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