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Fluid inclusion studies of mineralized zones of Kudrekonda, Kodikoppa and Palavanahalli, Honnali Gold deposit in Shimoga schist belt, Western Dharwar Craton

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Author Affiliations

  • 1Department of Applied Geology, Kuvempu University, Shankaraghatta, 577 451, India
  • 2Department of Applied Geology, Kuvempu University, Shankaraghatta, 577 451, India
  • 3Department of Applied Geology, Kuvempu University, Shankaraghatta, 577 451, India

Int. Res. J. Earth Sci., Volume 5, Issue (5), Pages 1-12, June,25 (2017)

Abstract

The general properties of fluid inclusions in hydrothermal ore-forming systems are considered and the interpretation of these data in terms of fluid evolution processes is discussed. The Honnali gold deposit is located at the southern part of the Shimoga schist belt. The characteristics of ore-forming fluids and metallogenesis were discussed by using fluid petrography, micro-thermometry. All three types of inclusions, mainly type I having homogenization temperatures at 16 to 28°C, and salinities ranging from 1.49 to 5.32 Wt% Nacl.eqv. The initial ice melting temperatures (TFM) range from -56.6 to -56.7°C. This implies that the major component in aqueous phase is NaCl dominated with NaCl ± KCl and H2O in the fluid system. Primary carbonic fluid inclusions in these samples are typically mono-phase at room temperature. The type-II, the melting temperature of CO2 range from -56.6° C to -57.2ºC indicating that the fluid dominate by CO2 and the maximum depression of melting temperature of CO2 is -57.20C (Table-1), indicating the fluid contains CO2 with very minor amount volatile gases such as (i.e. CH4/N2). Type –III, the final melting temperature of ice ranges from -12 to - 0.3°C which corresponds to a salinity range of 0.5 to15.76 Wt% NaCl equivalent, Application of standard criteria for the recognition of primary, pseudo-secondary and secondary inclusions is essential. Furthermore, as stated by Roedder and Bodnar, most inclusions in most samples can be presumed to be secondary, unless proved otherwise.

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