Reconstruction of the hydrothermal history of the Cu–Ag vein-type mineralisation at Dikulushi, Kundelungu foreland, Katanga, D.R. Congo

Autor: Stijn Dewaele, Philippe Muchez, Wouter Heijlen, Terry Lemmon, Roger Tyler, Amanda Boutwood
Rok vydání: 2006
Předmět:
Zdroj: Journal of Geochemical Exploration. 89:376-379
ISSN: 0375-6742
DOI: 10.1016/j.gexplo.2005.11.010
Popis: The Kundelungu foreland, north of the Lufilian arc in the Democratic Republic of Congo, contains a number of various veintype 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.
Databáze: OpenAIRE
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