Abstract
Gold mineralization at G. R. Halli is located along the Central shear zone of Chitradurga schist belt, extending from west of Gonur, through east of G. R. Halli and C. K. Halli to east of Honnemardi, roughly parallel to stratigraphic units. The NNW-SSE trending shear zone has a width of 0.5 to 1.5 km shows extensive carbonatization of metabasalts and the associated lithologies confined to NNW-WNW trending arcuate brittle-ductile zone. The sheared and silicified contact zones between carbonaceous argillite and schistose metabasalt form the potential sites for localization of mineralization. The gold is associated with sulphides mainly pyrite, arsenopyrite, galena, sphalerite, minor chalcopyrite. Textural relationship indicates two stage sulphide mineral assemblages co-relatable with two stage fluid ascents having temperature of homogenization between 125°C and 256°C. It is a typical epigenetic lode gold system, which got affected by later deformation.
Highlights
The granites contain xenolithic enclaves of country rocks. Gold mineralization in this part of the Chitradurga schist belt is mainly confined to a major NNW-SSE trending shear zone extending from NW of Gonur towards C
Shear systems in Chitradurga schist belt have a distinct role as many of the known gold occurrences are situated along the three major shear zones viz., CEMSZ, CCSZ and CWMSZ
Some of the earlier workers have opined two general associations of gold mineralization in CSB i.e., vein associated deposits mainly in metavolcanic rocks and stratiform-strata bound deposits in banded iron formation or Fe-rich cherts. In both the cases there is a distinct role of shear zone, which served as important conduits for the transfer of fluids and melts in the lithosphere
Summary
The mineralization is mainly shear controlled, epigenetic in nature, and has fluids that circulated at 2.5 km depth at temperature and pressure conditions of 241.27 ̊C and 0.6 Kb respectively [6]. The study area has witnessed intense carbonatization, resulting in culmination of primary features and overprinting of later activities. In view of this an attempt has been made in this paper to understand the role of deformation and nature of mineralization fluid through fluid inclusion signatures
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