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      https://www.ias.ac.in/article/fulltext/jess/124/02/0419-0430

    • Keywords

       

      Hazaribagh thermal spring; Bakreswar and Tantloi thermal spring; geochemistry of thermal water.

    • Abstract

       

      The chemical and isotopic compositions of thermal springs located along the Son–Narmada–Tapti (SONATA) mega lineament in central India have been investigated. The issuing temperatures of the thermal waters vary from 31° to 89°C for the thermal springs and 24° to 25°C for the cold springs. These thermal springs are located on the Archean Chotanagpur Gneissic Complex (CGC) in the eastern part of peninsular India. The thermal springs are mostly alkaline in nature with pH varying from 7.5 to 9.5. Piper diagram suggests that the chemistry of the thermal waters is compatible with the granitic host rocks through which the waters circulate. Mineral saturation index suggests that the thermal waters are saturated with cristobalite and quartz at lower temperatures (less than $\sim$130 to 150°C), and calcite and forsterite at higher temperatures ($\sim$160° to 250°C). The estimated reservoir temperature based on chemical geothermometers is in the range of 132°–265°C, which favours a medium enthalpy geothermal system. Oxygen isotope fractionation of Bakreswar and Tantloi thermal springs highlights a higher reservoir temperature than estimated by chemical geothermometer. Positive gravity anomalies over Bakreswar and Tantloi areas strongly suggest a basement/mantle upliftment or mafic intrusion which could account for the heat source close to the surface. However, the large negative gravity anomaly depression around the Surajkund and Katkamsandi thermal springs indicates presence of deep seated faults.

    • Author Affiliations

       

      Hemant K Singh1 D Chandrasekharam1 O Vaselli2 G Trupti1 B Singh1 3 4 Aref Lashin5 6 Nassir Al Arifi7

      1. Department of Earth Sciences, Indian Institute of Technology, Mumbai 400 076, India.
      2. Department of Earth Sciences, University of Florence, Via La Pira 4, I-50121 Firenze, Italy.
      3. IITB-Monash Research Academy, Indian Institute of Technology Bombay, Mumbai 400 076, India.
      4. Civil Engineering Department, Monash University, Clayton, Melbourne 3800, Australia.
      5. King Saud University, College of Engineering – Petroleum and Natural Gas Engineering Department, Riyadh 11421, Saudi Arabia.
      6. Geology Department, Benha University, P.O. Box 13518, Benha, Egypt.
      7. King Saud University, College of Science – Geology and Geophysics Department, P. O. Box 2455, Riyadh 11451, Saudi Arabia.
    • Dates

       
  • Journal of Earth System Science | News

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