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元古代威特沃特斯兰(南非)金、铀矿床中产出的金属矿物有七十多种,其中具有重要经济价值的主要矿物是金、铀、铂族矿物及黄铁矿。这些矿物主要富集在威特沃特斯兰统各砾岩条带中,这些砾岩被认为是已演变成充有水的山间盆地的冲积扇的一部分。 为了解释威特沃特斯兰矿床的矿化成因,最初提出了两种相互矛盾的学说:一是热液说,根据这一学说金属矿物则是在威特沃特斯兰沉积物沉积以后,由岩浆成因溶液带入的;二是砂矿说,认为大多数矿石矿物是以碎屑物形式同威特沃特斯兰沉积物一道沉积的,沉积之后,一些矿石矿物就地重结晶,而当前按一
Proterozoic Witwatersrand (South Africa) gold, uranium deposits produced in more than seventy kinds of metal minerals, of which the main economic value of the main minerals are gold, uranium, platinum group minerals and pyrite. These minerals are predominantly enriched in the Witwaterstein conglomerate conglomerate, which is considered to be part of an alluvial fan that has evolved into a water-filled mountain basin. To explain the mineralization of the Witwatersrand deposit, two conflicting doctrines were first proposed: one is hydrothermal theory, according to which the metal mineral is deposited after the Witwatersrand sediments, By the magma caustic solution into; the second is that the sand said that most of the ore minerals that are in the form of debris deposited with the Witwatersrand sediments, after the deposition, some ore minerals recrystallization in situ, and Press one at a time