Abstract
Grain-scale structures of the granitoid rocks from the north-western part of the Bundelkhand craton, central India are analysed with the aid of an optical microscope and electron probe micro analyser. Although field-based studies and quick microscopic observations suggest an overall porphyritic texture of the Bundelkhand granitoid, detailed microstructural observations reveal a significant deviation from the first-order igneous porphyritic texture. Here, we show that the Bundelkhand granitoid has three distinct grain-scale structures: (i) original pristine igneous structures, (ii) ductile deformation-related structures, and (iii) brittle fracturing-related structures. Based on microstructural evidences, we argue that the deformation-induced structures (both brittle and ductile) are not restricted to solid state, rather these structures initiated in the sub-magmatic stage and nucleated in partially crystallised magma during the magmatic to sub-magmatic event of the crystallisation history.
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Acknowledgements
This study is a part of the doctoral research of GS. The authors sincerely thank the EMPA laboratory members of Banaras Hindu University, especially, Prof N V Chalapathi Rao and Dr Dinesh Pandit for the EPMA analysis. The authors also acknowledge the infrastructural facilities provided by Banaras Hindu University. The authors are grateful to two anonymous reviewers for their comments and the handling editor Prof Saibal Gupta for his suggestions that improved the quality of the article. SB acknowledges the financial help provided by DST SERB under project ECR/2018/000586. This study marks the first contribution of the Laboratory for Analyses of Magnetic and Petrofabric (LAMP) at Banaras Hindu University.
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Sarkar, G., Acharya, S., Banerjee, S. et al. Grain-scale anatomy of the Bundelkhand granite: Implications for the interplay of magmatic to sub-magmatic deformation mechanisms. J Earth Syst Sci 128, 213 (2019). https://doi.org/10.1007/s12040-019-1235-1
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DOI: https://doi.org/10.1007/s12040-019-1235-1