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Tectonic imprints within a granite exposed near Srinagar, Rajasthan, India

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Abstract

Partial melting in the middle to lower crustal level produces melts of granitic composition during orogeny. Thrusts play a vital role in their exhumation after consolidation of these granitic melts. In this paper we focus on one such granite along the eastern margin of the Delhi Fold Belt (DFB) rocks near Srinagar, Rajasthan, India. This is the first report of granite within the area and holds a key stratigraphic position in the entire rock package. The said granite is found to be intrusive to the DFB metasediments as well as their basement popularly known as the Banded Gneissic Complex (BGC). We disentangle the deformation fabrics seen within the granite and associated DFB metasediments, suggesting that subsequent to emplacement and consolidation, the granite has co-folded along with the country rocks. Three deformational events could be identified within the DFB metasediments namely, D1D, D2D and D3D. The peak metamorphism was achieved in the D1D event. The granite magma is generated and emplaced late syn-kinematic to D1D and thereafter is deformed by D2D and D3D producing D1G and D2G structural fabrics. These compressive deformations resulted in the collapse of the basin; the combined package of DFB rocks and the granite was thrusted eastwards over the basement rocks. The tectonic transport direction during thrusting is suggested eastwards from our structural analysis. Transverse faults developed perpendicular to the length of the granite have led to partitioning of the strain thereby showing a heterogeneity in the development of fabric within it.

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Acknowledgements

The authors would like to thank the help and support extended by the local people for this work. ND wishes to acknowledge the grant received from UGC (Sanction No. F.PSW-070/09-10 (ERO) dated 18.10.2009). The authors also like to express their gratitude to Dr S Pal of Durgapur Government College, West Bengal (who refrained from being an author of this paper) for discussions held on and off the field. The authors are also thankful to Prof. D Mukhopadhyay for his critical comments, advice and guidance. The suggestions and comments from the anonymous reviewers are also duly acknowledged.

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  1. Department of Geology, Presidency University, 86/1 College Street, Kolkata, 700 073, India

    Trishit Ruj & Nilanjan Dasgupta

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  1. Trishit Ruj
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Ruj, T., Dasgupta, N. Tectonic imprints within a granite exposed near Srinagar, Rajasthan, India. J Earth Syst Sci 123, 1361–1374 (2014). https://doi.org/10.1007/s12040-014-0461-9

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