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矿体的形成,也同其他事物一样,应具备必要条件和充分条件.我们在化探工作中所获得的异常,其成矿元素的丰度、规模等,往往只反映矿体形成的必要条件,至于充分条件是否存在,那是不一定的.如果二者具备,则为矿异常,如果只有前者,那还是非矿异常. 例如,我们在进行斑岩铜矿的研究时,发现了某岩体中较好的铜、钼异常,其丰度、规模,甚至对比典型模式都是令人乐观的,但它所反映的矿床却并不理想:经研究,铜的丰度之所以高,只不过是黄铜矿、黄铁矿、黑云母以及其他硅酸盐矿物中Cu~(2+)的总含
The formation of ore bodies, like other things, should have the necessary and sufficient conditions.An abnormality obtained by our work in geochemical exploration and the abundance and scale of ore-forming elements often only reflect the necessary conditions for ore body formation , As for the existence of sufficient conditions, it is not certain.If the two are, then the mine anomaly, if only the former, it is non-mine anomaly.For example, when we conducted a study of porphyry copper, found a rock The good copper and molybdenum anomalies in the body are optimistic about their abundance, scale, and even typical patterns, but the deposits they reflect are not ideal: the abundance of copper is so high that only But is the total content of Cu2 + in chalcopyrite, pyrite, biotite and other silicate minerals