northwest Witwatersrand Gold Deposits, South Africa
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold deposits of the world  |  Topic: Witwatersrand Gold Deposits, South Africa 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: Monday January 31 2011 09:34:17 AEDT AM »

Recent Developments Concerning the Geological History and Genesis of the Witwatersrand Gold Deposits, South Africa
Abstract
Although the gold mining industry in the Witwatersrand has passed its maturity, the Witwatersrand basin remains by far the most important known gold-producing province. Most of the gold occurs together with rounded pyrite and uraninite, and in places with bituminous carbon, along degradation surfaces in coarse grained siliciclastic rocks of the 2.97 to 2.91 Ga West Rand Group, and more importantly, in similar rocks of the 2.89 to 2.71 Ga Central Rand Group. Significant correlation between gold and detrital zircon distribution,as well as sedimentary lithofacies, preservation of detrital micronuggets in places, and absolute age data provide evidence of a detrital origin of the gold, which was derived from the weathered products of 3.1 to 2.9 Ga greenstone belts to the north and west, and transported and concentrated by fluvial selective entrainment processes. Eolian deflation led to further upgrading of the placer deposits. Microstructural, mineral chemical, and isotopic evidence indicate a detrital origin also for rounded compact pyrite and uraninite particles, from which reducing conditions are inferred for the Archean meteoric environment.
These conditions prevailed until at least 2.64 Ga, when the last Witwatersrand-type placer deposits were laid down at the base of the Transvaal basin.
  
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold deposits of the world  |  Topic: Witwatersrand Gold Deposits, South Africa « previous next »
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