Abstract
The Mohar (Dhala) circular structure, Shivpuri district, Madhya Pradesh, is an established impact structure. Most work on this structure revolves around petrological, mineralogical, geochemical and geochronological aspects. The present work aims to decipher the subsurface nature of this structure by using accrued borehole data, in tandem with petrological identification of key marker horizon. The melt breccia unit is taken as the marker horizon and the various attributes of its contact with the underlying granite basement and overlying sediments of pre-Vindhyan Dhala Formation were utilised to ascertain the thickness of each unit. The study shows that there is no signature of weathered surface between Dhala sediments and melt breccia unit, thereby suggesting continuity between the two units, without any notable hiatus. Isopach maps and surface contours of contacts have also been attempted, which indicated the absence of a central uplift of the crater floor, since a central uplift should have elevated the basement granitic rocks at the centre of the structure leading to a basement high, which is not so in the present case. It is established by this study that the structure is that of a simple crater without a central uplift.
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The authors are thankful to the Director, AMD, for the permission to publish the paper. Efforts of all colleagues connected to the work are appreciated. R C Rana is thanked for helping with maps and figures.
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Madhuparna Roy carried out petrological analyses of surface and borehole samples, critically reviewed and integrated lithological data and drafted the manuscript. K K Sinha carried out major field work and lithologging of boreholes along with interpretation of borehole data. R P Singh carried out field work, studied datasets and performed modelling. Pradip Pandey conceptualised the idea, overviewed the MS writing and supervised the work.
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Communicated by N V Chalapathi Rao
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Roy, M., Sinha, K.K., Singh, R.P. et al. Reconstruction of subsurface configuration of Mohar (Dhala) impact structure, Shivpuri district, MP. J Earth Syst Sci 132, 35 (2023). https://doi.org/10.1007/s12040-022-02027-4
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DOI: https://doi.org/10.1007/s12040-022-02027-4