北山南部炭窑井地区花岗岩型铀矿地质特征及找矿模型

Geological Characteristics and Prospecting Model of Granite-type Uranium Deposits in Tanyaojing Area, Southern Beishan

炭窑井地区位于北山造山带南部古活动大陆边缘的构造岩浆活化区,是花岗岩型铀矿成矿有利区域。通过对炭窑井地区构造与铀矿化的空间关系、岩浆岩特征和热液蚀变的研究,厘定了构造演化的四个期次。NWW向断裂构造既是导矿构造,也是含矿构造,其中F4和F5断裂及二者夹持区域具备“构造+岩体+热液蚀变”的成矿有利条件,且已发现较好的铀矿找矿线索,显示该区具有巨大的铀矿找矿潜力。热液蚀变以绿泥石化、赤铁矿化和碳酸盐化蚀变组合为主,该套蚀变组合与铀矿化呈正相关性,其中绿泥石化和赤铁矿化蚀变与铀矿化关系最为密切。在总结构造演化与铀矿化成因关系基础上建立找矿模型,进行了炭窑井地区花岗岩型铀矿成矿潜力分析。

The Tanyaojing area is located in the tectonic magma activation area of the ancient active continental margin in the southern Beishan orogenic belt, and is a favorable area for granite-type uranium deposits. Four stages of tectonic evolution were determined by studying the spatial relationship between structure and uranium mineralization and the characteristics of magmatic rocks and hydrothermal alteration in the Tanyaojing area. The NWW-trending fault structure is both an ore-conducting structure and an ore-bearing structure. Among them, the F4and F5faults and the area sandwiched by them have favorable metallogenic conditions of "structure + rock mass + hydrothermal alteration", and good uranium has been found. Mineral prospecting clues show that this area has huge prospecting potential for uranium ore. The hydrothermal alterations are dominated by the combinations of chlorite, hematization and carbonatization alterations, which are positively correlated with uranium mineralization. Mineralization is the most closely related. Finally, a prospecting model was established on the basis of summarizing the relationship between tectonic evolution and uranium mineralization, and the metallogenic potential of granite-type uranium deposits in the Tanyaojing area was evaluated.