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粤北石土岭铀矿床碱交代作用十分发育,矿区范围内围岩蚀变强烈,主要发育有白云母化、钾长石化、绿泥石化、绢云母化等蚀变类型。它们多呈面状展布,与铀成矿关系十分密切。本文根据含矿主岩、碱交代岩、辉绿岩与沥青铀矿在形成时间上的对比,以及碱交代岩的地球化学特征研究,认为石土岭铀矿床的碱交代作用主要是地幔流体沿深层次伸展构造上升过程中产生的交代作用形成的。
The alkali metasomatism of the Shitouling uranium deposit in northern Guangdong is well developed. The alteration of the surrounding rock in the mining area is intense with the alteration of muscovite, potassium feldspar, chloritization and sericitization. They are mostly surface distribution, and uranium metallogenetic relationship is very close. According to the comparison of formation time of diabase and diabase uranium deposits, and the geochemical characteristics of alkali-substituting rocks, this paper argues that the alkali metasomatism of the Shitouling uranium deposit is mainly caused by the fluid along the mantle Formed by the alternation of the deep extensional tectonic uplift.