MAGMATIC GENESIS OF URANIUM-GOLD-ORE DEPOSITS IN WITWATERSRAND, THE REPUBLIC OF SOUTH AFRICA

S. S. Dolgushin 1, G. N. Cherkasov 1, A. P. Dolgushin 2

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 Berezovgeologiya, the Siberian Branch of AO Urangeo, Novosibirsk, Russia

Based on critical analysis of the references available on the uranium-gold-ore deposits of Witwatersrand (the Republic of South Africa) and the use of current experimental data on the structure and composition of ore-magmatic systems, it can be concluded that fragmentary uranium-gold-bearing quartz rocks of these deposits, identified as conglomerates, are pseudoconglomerates. It is shown that their formation is due to ore-bearing and substantially siliceous (uranium-gold) fluid magma, which derived from differentiated source siliceous magma of liquation differentiate. It is due to intrusion of this magma, accompanied with local closed explosions, that the uranium-gold-ore quartz rocks were formed, having various structures, from conglomeratetype to breccia-type and breccia, whiсh form these deposits.

Key words: deposit, uranium, gold, fluid magma, conglomerates, pseudoconglomerates, siliceous melt, gel, colloid, Witwatersrand.

DOI 10.20403/2078-0575-2017-2-92-103 

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