The nature of hydrothermal fluids associated with granite-hosted, polymetallic mineralisation in the Eastern lobe of the bushveld complex.

[摘要] Numerous small base-metal deposits occur in the acidic rocks of the Bushveld Complex, andmodern exploration programs are currently re-examining this metallotect in an attempt to refinethe current working hypothesis for mineralisation in these granites. The hypothesis proposedfor the origin of mineralisation is multifaceted, encompassing both spatial and temporalrelationships between at least three episodes of ore formation. The first episode ofmineralisation (typified by the Zaaiplaats tin deposit) occurred at relatively high temperatures(>600'C to 4000' C), and resulted in the formation of orthomagmatic cassiterite, scheelite andan early generation of fluorite. At lower temperatures (200°C

[发布机构] University of the Witwatersrand