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      https://www.ias.ac.in/article/fulltext/jess/128/08/0213

    • Keywords

       

      Magmatic deformation; tectonics; microstructure; granite; Bundelkhand craton

    • 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 ofthe 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 thesestructures initiated in the sub-magmatic stage and nucleated in partially crystallised magma during the magmatic to sub-magmatic event of the crystallisation history.

    • Author Affiliations

       

      GOUTAM SARKAR1 SHRIZA ACHARYA1 SAYANDEEP BANERJEE1 ABDUL MATIN2 SARAJIT SENSARMA3 HARI B SRIVASTAVA1

      1. Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India.
      2. Department of Geology, University of Calcutta, Kolkata 700 019, India.
      3. Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India.
    • Dates

       
  • Journal of Earth System Science | News

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