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Geochronological study of metasediments and carbon isotopes in associated graphites from the Sargur area, Dharwar craton: Constraints on the age and nature of the protoliths

Journal of the Geological Society of India volume 85, pages 577–585 (2015)Cite this article

Abstract

207Pb/206Pb ages of detrital zircons from the graphite bearing metasediments of the Sargur area are determined using ion microprobe to constrain the probable depositional age. Zircon ages of the samples range from 2.3 to 2.8 Ga which are close to the reported metamorphic ages in the vicinity. Absence of older age (Mesoarchaean >3.0 Ga) in these samples suggest that detrital zircons from the Sargur supracrustal unit has been reset by younger post-depositional metamorphic processes and probably reflect a craton-wide Paleoproterozoic event. The graphites from these samples vary in concentration of carbon as well as in 13C/12C isotopic ratio. The range of δ13C values of graphites indicates organic origin suggesting the existence of bio-organisms in the Sargur area during the Paleoproterozoic period.

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Authors and Affiliations

  1. Department of Earth Sciences, Manipur University, Canchipur, Imphal, 795003, Manipur, India

    B. Maibam

  2. Department of Earth Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, Nadia, 741 252, West Bengal, India

    P. Sanyal

  3. Research Center for Environmental Changes, Academia Sinica, Taiwan

    S. Bhattacharya

  4. Physical Research Laboratory, Ahmedabad, 380 009, India

    B. Maibam, P. Sanyal & S. Bhattacharya

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  1. B. Maibam
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  2. P. Sanyal
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  3. S. Bhattacharya
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Maibam, B., Sanyal, P. & Bhattacharya, S. Geochronological study of metasediments and carbon isotopes in associated graphites from the Sargur area, Dharwar craton: Constraints on the age and nature of the protoliths. J Geol Soc India 85, 577–585 (2015). https://doi.org/10.1007/s12594-015-0252-1

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  • DOI: https://doi.org/10.1007/s12594-015-0252-1

Keywords

  • Dharwar
  • Sargur
  • graphite
  • zircon
  • geochronology
  • carbon isotope