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三、后生原生金矿形成的地质地球化学前提除了相当于古砂矿那样的已岩化的风化残积、冲洪积成因的同生沉积金矿床,一般认为,由分异岩浆结晶形成的同生金矿床几乎是不存在的。世界上的多数原生矿床都是后生的。Rand型矿床是沉积变质矿床,应属同生沉积后生变质改造矿床。关于后生原生矿床的成因或物质来源,迄今为止,已有四种说法: 1.深源说。认为金及其伴生元素来自
Geological and geochemical preconditions of the epigenetic primary gold mine In addition to the lithic deposi- tional sedimentary gold deposits that have been lithified, such as the ancient sand, it is generally believed that the same genera formed by the differentiation of magma crystals Gold deposits are almost nonexistent. Most primary deposits in the world are epigenetic. The Rand-type deposit is a sedimentary metamorphic deposit and should belong to the same genesis and sedimentary metamorphism and alteration deposit. As far as the genesis or material source of the epigenetic primary deposit is concerned, there are four versions so far: 1. Deep-source theory. Think gold and its accompanying elements come from