Journal of the Geological Society of India

, Volume 87, Issue 1, pp 43–54 | Cite as

U-Pb SHRIMP ages of detrital zircons from Hiriyur Formation in Chitradurga greenstone belt and its implication to the Neoarchean evolution of Dharwar craton, south India

  • A. Nasheeth
  • T. Okudaira
  • K. Horie
  • T. Hokada
  • M. Satish-Kumar
Research Articles

Abstract

We report newly obtained U-Pb SHRIMP ages of detrital zircons from metagreywackes in the Hiriyur Formation (Chitradurga Group, Dharwar Supergroup) from the central eastern part of the Chitradurga greenstone belt. U-Pb analyses yield three major Neoarchean age populations ranging from 2.70–2.54 Ga with some minor age population of Mesoarchean. The maximum age of deposition is constrained by the youngest detrital zircon population at 2546 Ma. This is the first report of the occurrence of supracrustal rocks less than 2.58 Ga in the central part of Chitradurga greenstone belt. Close evaluation of detrital ages with the published ages of surrounding igneous rocks suggest that the youngest detrital zircons might be derived from rocks of the Eastern Dharwar craton and the inferred docking of the western and eastern Dharwar cratons happened prior to the deposition of the Hiriyur Formation. The Chitradurga shear zone, dividing the Dharwar craton into western and eastern blocks, probably developed after the deposition. Furthermore, the lower intercept is interpreted as evidence for the Pan-African overprints in the study area.

Keywords

Archean Dharwar craton Chitradurga greenstone belt Hiriyur Formation SHRIMP U–Pb zircon age Pan African Karnataka 

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Copyright information

© Geological Society of India 2016

Authors and Affiliations

  • A. Nasheeth
    • 1
  • T. Okudaira
    • 1
  • K. Horie
    • 2
    • 3
  • T. Hokada
    • 2
    • 3
  • M. Satish-Kumar
    • 4
  1. 1.Department of GeosciencesOsaka City UniversityOsakaJapan
  2. 2.National Institute of Polar ResearchTokyoJapan
  3. 3.SOKENDAI (The Graduate University for Advanced Studies)TokyoJapan
  4. 4.Department of GeologyNiigata UniversityNiigataJapan

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