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Identifying the tectonically induced mineralisation zone in the central part of Dharwar-Shimoga greenstone belt, Western Dharwar Craton: an integrated analysis of gravity and magnetic data

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Abstract

The late Archean Western Dharwar Craton supergroup has volcanic and sedimentary rocks deposited during 2900–2600 Ma underlain by the Sargur Group basement of 3.36–3.2 Ga granitic gneiss and older supracrustal rocks. The western part of the craton, known as the western province (Dharwar Foreland), comprises four major schist belts (Western Ghats-Bababudhan-Shimoga-Chitradurga). A regional gravity and magnetic (Total Field) survey was done in the Shimoga region. The geophysical data of the study area reveal the subsurface extension and behaviour of the exposed rocks of the area. The Euler deconvolution was used to define the depth of the anomaly sources. Euler depth solution for the spherical body (structural index 2), window size = 10, and depth tolerance = 5% depicts the depth of the various sources. The Euler depth solutions cluster over the hook-shaped schist rock of the Medur group (at the northern part of the area) reveals that the body's depth varies from 1 to 4 km in the central part, and at the northern flank, it goes up to 7 km. The solution also brought out the depth of the anomalous body near Hithala, within 4 km. The 2D forward depth modelling of the anomalous zone brings out the involvement of the tectonic forces in the generation of this anomalous body. The more precise depth from the model has been estimated between 2 and 3 km. The model clearly shows the relationship between schist rocks and the basement. However, the high-gravity anomaly has been modelled as the manganese bearing horizon, which has come to optimum depth because of folding and faulting in the region, thus providing a favourable zone for manganese deposition.

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Acknowledgements

The authors are very grateful to the Editorial Team, Acta Geophysica. The corresponding author wishes to place on record great appreciation to all the geophysicists, geophysical logging team and geologist of GSI, southern region, who were engaged in data generation and have conscientiously collected this valuable data under NGPM, geophysical logging and geological mapping, respectively. The authors also thank Dr. Biplab Chakraborty, Director, GSITI, and Mr. B. Ravi, Sr. Geophysicist, for his support and technical advice. The authors also express thanks to Miss Nimmy Chandran, Sr. Geologist, Miss. Hima Raghunath, Sr. Geologist, and Mr. Jitender Kumar, Geologist, GSI, Bangalore, for their help identifying rock samples.

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Authors and Affiliations

  1. Geological Survey of India, Southern Region, Bandlaguda, Nagole, 500068, India

    Niharika Das, Sumit Kumar Bhattacharya & D. Livingston

  2. Oil and Natural Gas Corporation Limited, Dehradun, 248003, India

    Satya Narayan

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  1. Niharika Das
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  2. Sumit Kumar Bhattacharya
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  3. Satya Narayan
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  4. D. Livingston
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Correspondence to Niharika Das.

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Edited by Prof. Ivana Vasiljevic (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).

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Das, N., Bhattacharya, S.K., Narayan, S. et al. Identifying the tectonically induced mineralisation zone in the central part of Dharwar-Shimoga greenstone belt, Western Dharwar Craton: an integrated analysis of gravity and magnetic data. Acta Geophys. 72, 1731–1748 (2024). https://doi.org/10.1007/s11600-023-01181-7

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