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      https://www.ias.ac.in/article/fulltext/jess/116/06/0497-0510

    • Keywords

       

      Quartz vein; Bundelkhand Craton; hydrothermal; central India.

    • Abstract

       

      Giant quartz veins (GQVs; earlier referred to as ‘quartz reefs’) occurring in the Archean Bundelkhand Craton (29, 000 km2) represent a gigantic Precambrian (∼2.15 $Ga$) silica-rich fluid activity in the central Indian shield. These veins form a striking curvilinear feature with positive relief having a preferred orientation NE–SW to NNE–SSW in the Bundelkhand Craton. Their outcrop widths vary from ≤ 1 to 70m and pervasively extend over tens of kilometers along the strike over the entire craton. Numerous younger thin quartz veins with somewhat similar orientation cut across the giant quartz veins. They show imprints of strong brittle to ductile–brittle deformation, and in places are associated with base metal and gold incidences, and pyrophyllite-diaspore mineralization. The geochemistry of giant quartz veins were studied. Apart from presenting new data on the geology and geochemistry of these veins, an attempt has been made to resolve the long standing debate on their origin, in favour of an emplacement due to tectonically controlled polyphase hydrothermal fluid activity.

    • Author Affiliations

       

      J K Pati1 S C Patel2 K L Pruseth3 V P Malviya1 M Arima4 S Raju5 P Pati1 K Prakash1

      1. Department of Earth and Planetary Sciences, Nehru Science Centre, University of Allahabad, Allahabad 211 002, India.
      2. Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai 400 067, India.
      3. Department of Earth Sciences, Pondicherry University, Pondicherry 605 014, India.
      4. Graduate School of Environmental and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240 8501, Japan.
      5. Geological Survey of India (SR), Chennai 605 014, India.
    • Dates

       
  • Journal of Earth System Science | News

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