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本文对康滇地轴中南段铀矿化划分出3种类型(砂岩型、钠交代岩型和元古代浅变质岩型),并阐明其主要特征。提出了元古代地壳演化曾经历了原始古陆形成阶段、沉降活动阶段和基底再团结阶段,认为中元古界昆阳群是有别于典型的含铀碳硅泥岩沉积建造。通过对该区部分岩石原始铀含量进行研究,提出了有关岩石可作为该区铀源岩的新认识;划分出碱性和酸性两大类型的热液蚀变,指出本区以发育碱性蚀变地段的成矿前景较好。指出该区铀成矿前景:(1)该区不具备形成澳加式元古代不整合面型铀矿床的地质条件;(2)非澳加式元古代不整合面型的铀成矿前景较差;(3)本区碱(钠)交代岩型铀矿化具有一定的找矿前景。
In this paper, three types (sandstone type, sodium metamorphic rock type and Proterozoic shallow metamorphic rock type) are divided into uranium mineralization in the central-southern axis of Kangdi-Dianxi, and their main features are clarified. It is proposed that Proterozoic crustal evolution experienced the stage of primitive paleofacies formation, subsidence and reunion. It is believed that the Middle Proterozoic Kunyang Group is different from the typical sedimentary deposit of uranium-bearing carbon-silicon mudstone. Based on the study on the original uranium content of some rocks in this area, the authors put forward some new understandings that the rocks can be used as uranium source rocks in this area, and divide the two types of hydrothermal alteration into alkaline and acid. Variable prospecting is better. The prospect of uranium mineralization in the area is pointed out: (1) The geological conditions of forming an Australian Canadian unconsolidated uranium deposit are not available in this area; (2) Poor; (3) alkali (sodium) metamorphic rock-type uranium mineralization in this area has certain prospecting potential.