Geochemical identification of episodes of gold mineralisation in the Barberton Greenstone Belt, South Africa

摘要

The morphology and mineral chemistry of gold and associated sulphides at Sheba, Fairview, and New Consort gold mines in the Barberton Greenstone Belt (BGB) identify two main types of mineralization. The first type occurs associated with sulphides (mainly pyrite), either as inclusions (10-30 mu m) or as sub-microscopic gold. The second gold type consists of large gold grains (>= 100 mu m) within the silicates (mostly quartz).