内蒙古巴音塔拉钼矿地质特征及成因探讨

巴音塔拉钼矿位于乌力吉-欧布拉格铜、金成矿带,钼矿体产在石炭系上统阿木山组中,矿体的形态、产状受岩性、构造控制较为明显,分布范围、产状与矽卡岩、角岩的分布范围、产状相一致。1-1号钼矿体平均品位为0.12%,最高品位为8.55%,品位系数变化较大;1-2号钼矿体平均品位为0.73%。矿床围岩蚀变强烈,与矿化关系较为密切的围岩蚀变主要有矽卡岩化、角岩化,化探异常主要元素组合为Mo、Au、Ag、Cu、Zn、W、Sn、Bi,各元素异常套合较好,均达4级以上浓度。矿床的围岩蚀变、元素地球化学特征等均具有矽卡岩型矿床的特点。

Bayan Tal Mo Deposit Geological Characteristics of Inner Mongolia

The Bayan Tal Mo deposit is located in the Ulji-Oubu La Cu-Au Metallogenic belt, with Mo- bearing orebodies hosted by the upper Carboniferous Amushan Formation. The shape of orebody is obviously controlled by structures （mainly faults） and formation lithology, and distribution of which is consistent with skarn and hornfelsed rocks. Nowadays, two ore bodies are blocked out. The average grade and highest grade of molybdenum of ore body No. 1-1 is 0. 12 ）〈 10-2 and 8. 55 X 10-2, respectively, with great variation coefficient, while the average grade of ore body No. 1-2 is 0. 73 X 10-z. Alteration of this deposit is well developed, of which skarnization and hornfelization are closely associated with Mo minerali- zation. The geochemical anomalies have the element association of Mo, Au, Ag, Cu, Zn, W, Sn, and Bi, and they are consistent well with each other （abundence of each element in this deposit is four times more than its background value）. Both the features of alteration and anomalous elements in the Bayan Tal Mo deposit have the characteristics of skarn deposit.