Abstract
The Murchison greenstone belt (MGB) represents one of a number of Archaean volcano-sedimentary successions within the Kaapvaal Craton of South Africa (Fig. 1, inset). It is situated approximatively 200 km north of the 3.5 to 3.2 Ga Barberton greenstone belt. The belts form part of the cratonwide Thabazimbi-Murchison lineament which represents a major suture along which assembly of the northern Kaapvaal Craton took place (Mc Court, 1995). Gold, antimony, arsenic, tungsten and mercury are the most frequent metals found in strncturaly controlled, hydrothermal ore deposits on the central portion of the belt. In addition, volcanogenic copper-zinc massives sulphide and pegmatite-related emerald mineralization are located in the northern and southern parts of the belt, respectively. This study presents new U-Pb isotope determinations on single zircon grains from key formations in the MGB, as well as Pb-Pb isotopic determinations of pyrites associated with gold, antimony and emerald mineralization.
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