Journal of Geochemical Exploration vol:89 issue:1-3 pages:376-379
The Kundelungu foreland, north of the Lufilian are 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 degrees C). The later, economically more significant vein-related Cu-Ag mineralisation formed from intermediate salinity, lower temperature (4682 degrees C) Na-Cl fluids. Weathering of the sulphide minerals resulted in a supergene enrichment with the formation of secondary Cu-minerals. (C) 2006 Elsevier B.V. All rights reserved.