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陕西丹凤地区,是我国伟晶花岗岩型铀矿的重要产地,开展该区铀矿化地质特征和成矿作用的研究,对该区的找矿预测有重要意义。结合前人基础地质、成矿作用、同位素年代学等方面的研究成果,通过重点研究纸坊沟地区秦岭岩群郭庄岩组原岩建造、变质岩组合及含铀性,侵入体年龄、侵位机制、空间形态和铀矿化特征,以及对铀成矿地质条件进行分析。结果表明:纸坊沟地区铀矿是早泥盆纪北秦岭造山带后碰撞拉伸期区域构造岩浆活动、地层含铀性和地壳深部碱性流体多因素耦合作用的结果;秦岭岩群郭庄组发生部分熔融,产生的纸坊沟侵入体与深部碱性流体混合、就位于穹窿构造并发生钾交代作用,是本区铀成矿的基本条件;铀矿化产于中粗粒-伟晶状钾质花岗岩中,铀矿体具有品位低、厚度大、多层产出的特点。
The Danfeng area in Shaanxi Province is an important producing area of the Wei Jing granitoid type uranium deposit in our country. It is of great significance to carry out the research on the geological characteristics and mineralization of uranium mineralization in this area. Based on the research results of predecessor’s basic geology, mineralization and isotopic chronology, the author focused on the study of the original rock formation, metamorphic rock assemblages and the uranium-bearing characteristics of the intrusive body and the emplacement mechanism in the Guozhuangyan Formation of the Qinling Group in the Qinfanggou area , Spatial morphology and uranium mineralization, as well as the geological conditions of uranium mineralization. The results show that the uranium deposits in the Zhanfanggou area are the result of multi-factor coupling of uranium and alkaline fluid in the deep crust in the area of the northern Qinling orogenic belt of the Early Devonian during the post-collision extension. Group formed part of the melting, resulting in the mixing of the Fangfanggou intrusion with the deep alkaline fluid, located in the dome structure and the generation of potassium metasomatism, which is the basic condition for uranium mineralization in this area; uranium mineralization in the coarse grain - Wei Jing In the potash granite, the uranium ore body has the characteristics of low grade, large thickness and multi-layer output.