湖南曾家溪锑钨矿地质特征及深部找矿潜力

Geological Characteristics and Prospecting Potential of Zengjiaxi Sb-W Deposit in Hunan Province

曾家溪锑钨矿与其北东侧的渣滓溪大型锑钨矿处于同一成矿区带,两者控矿特征类似,区域性NE向岳溪、马家溪等导矿断裂为成矿溶液运移提供了良好空间,控制了区域矿床的成生与展布。矿区赋矿地层为一套脆、韧性相间发育的岩性组合,锑、钨丰度高,其节理、劈理发育,易于含矿热液交代充填,成矿条件极为有利。分析了区域成矿地质背景、矿床地质特征,研究表明:(1)矿床主要受断裂、地层及岩性、褶皱控制;(2)寒武系小烟溪组碳质板岩、震旦系洪江组冰碛砾岩以及留茶坡组硅质岩,NEE—NE向断层,沿断裂分布的硅化,土壤中Sb、W、As浓集区,地表辉锑矿化或锑的氧化物等为有利找矿标志。在上述分析的基础上,结合矿区地质勘探成果,并通过类比渣滓溪锑钨矿,认为矿区矿化深度至少达到-500 m标高,找矿潜力较大。

Zengjiaxi Sb-W deposit and Zhazixi large scale Sb-W deposit that is located at the northwestern of Zengjiaxi Sb-W deposit are distributed at the same metallogenic belt,the ore-controlling characteristics of them are similar with each other,favorable space of the migration of metallogenic solution is provided by the regional NE tending Yuexi fault,Majiaxi fault,and the occurrence and distribution of the deposits in the area are controlled by the faults. The strata of the mining area is the interphase development of lithological combination of brittle and ductile,the contents of W and Sb are high,the joint and cleavage or the lithological combination are developed,which is conducive to the filling of ore-bearing hydrothermal solution,the metallogenic conditions of the mining area are favorable. The metallogenic geological background of the mining area,geological characteristics of the deposit are discussed in detail,the results show that：（1）the deposits in the mining area are mainly controlled by faults,formation and lithology,folds;（2） Cambrian System Xiaoyanxi Formation carbonaceous slate,Sinian System Hongjiang Formation moraine conglomerate and Liuchapo Formation siliceous rock,NEE-NE trending fault,the silicification distributed along the faults,concentration ares of Sb,W and As in soil,stibnite or antimony oxide in the surface of mining area are the favorable prospecting indicators. Based on the above analysis results,according to the newly prospecting and exploration results in the mining area,by anomaly to Zhazixi Sb-W deposit,the mineralization depth of Zengjiaxi mining area reaches to-500 m level at least,the prospecting potential of the depth of the mining area is huge.