湖南沃溪Au-Sb-W矿床中黑钨矿族矿物特征及其对矿床成因的指示  

Characteristics of the Wolframite Mineral Series and Implications for Metallogeny of the Woxi Au-Sb-W Deposit in Hunan Province

作　　者：陈爱清 唐攀科[2] 李国武[3] 邢万里[4] 

机构地区：[1]湖南省有色地质勘查研究院,长沙410015 [2]有色金属矿产地质调查中心,北京100012 [3]中国地质大学(北京),北京100083 [4]中国地质科学院矿产资源研究所,北京100037

出　　处：《高校地质学报》2014年第2期213-221,共9页Geological Journal of China Universities

基　　金：全国危机矿山接替资源找矿资助项目(20109901)

摘　　要：通过对湖南沃溪Au-Sb-W矿床鱼儿山-红岩溪矿段中黑钨矿族矿物的野外观察表明，含黑钨矿族矿物的矿石主要呈条带状、细脉状，次为浸染状构造，结构上主要为半自形-它形板状和柱状；X射线粉晶衍射结果得出其物相为钨铁矿，晶胞参数为a0：4.7454 A ，b0：5.7160A ，c0：4.9753 A ，β：90°13′；电子探针分析结果显示，MnO含量范围0.97%-11%，FeO含量范围13.65%-23.36%，WO3含量范围71.39%-76.87%，既有高MnO含量亦有低MnO含量的钨铁矿，成连续性变化，并从深部中段向浅部中段，MnO含量具有增大趋势。计算其晶体化学式为（Fe0.57-1.02Mn0.46-0.04）W0.98-1.00O4。相关分析得出FeO与MnO相关系数为-0.98，WO3与MnO相关系数为0.47，WO3与FeO相关系数为-4.10。黑钨矿族矿物中Nb和Ta的含量较低，暗示了沃溪Au-Sb-W矿床可能为沉积-改造热液成因。Through field observations in the Yu er shan and Hong yan xi ore section of the Woxi Au-Sb-W deposit in Hunan Province, we find that the ore structure of wolframite series occurs mainly as bands and veinlet, and is disseminated in less abundance. The texture is mainly subhedral-allotriomorphic lath. The results of x ray diffraction show that their phases are ferberite and their cell parameters are a0： 4.7454A , b0： 5.7160A , c0： 4.9753A , β： 90°13′. The results of EPMA show that the content of MnO is in the range of 0.97%-11%, with FeO in the range of 13.65%-23.36% and WO3 in the range of 71.39%-76.87%, including both high content and low content of MnO that varies continuously. From the deep to the shallow ore section, the content of MnO increases and forms the “reverse zone”. Crystalline formula is calculated to be （Fe0.57-1.02Mn0.46-0.04 ） W0.98-1.00O4. Correlation analysis of FeO and MnO shows that the correlation coefficient is -0.98; WO3 and MnO correlation 0.47; WO3 and FeO correlation coefficient is -4.10. The content of Nb and Ta of wolframite mineral series is low, suggesting possible sedimentary reworked hydrothermal genesis of theWoxi Au-Sb-Wdeposit.

关 键 词：沃溪Au-Sb-W矿床 钨铁矿 黑钨矿族 矿床成因 

分 类 号：P618.67[天文地球—矿床学]