Reconstruction of the hydrothermal history of the Cu–Ag vein-type mineralisation at Dikulushi, Kundelungu foreland, Katanga, D.R. Congo |
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Authors: | Stijn Dewaele Philippe Muchez Wouter Heijlen Amanda Boutwood Terry Lemmon Roger Tyler |
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Affiliation: | aGeodynamics and Geofluids Research Group, K.U. Leuven, Celestijnenlaan 200C, 3001 Leuven, Belgium;bAnvil Mining NL, Congo;cDepartment of Earth Sciences, Leeds University, Woodhouse Lane, Leeds LS29JT, UK |
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Abstract: | The Kundelungu foreland, north of the Lufilian arc in the Democratic Republic of Congo, contains a number of various vein-type and stratiform copper mineralisations. The geodynamic context and metallogenesis of these mineral occurrences remain enigmatic. Currently, the vein-type Cu–Ag ore deposit at Dikulushi is the most significant deposit in the region. Mineralisation at Dikulushi comprises two major styles: 1) a polysulphide assemblage (Zn–Pb–Fe–Cu–As) within brecciated rocks along an anticlinal closure; and 2) a vein-hosted Cu–Ag assemblage. Petrographic and fluid inclusion studies indicate that the early Zn–Pb–Fe–Cu–As assemblage formed from a high-salinity Ca–Na–Cl fluid of modest temperature (135–172 °C). The later, economically more significant vein-related Cu–Ag mineralisation formed from intermediate salinity, lower temperature (46–82 °C) Na–Cl fluids. Weathering of the sulphide minerals resulted in a supergene enrichment with the formation of secondary Cu-minerals. |
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Keywords: | Cu– Ag mineralisation Democratic Republic of Congo Kundelungu foreland Fluid inclusions |
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