青海迎庆沟铅锌多金属矿床地质特征与成因

Geological characteristics and genesis of Yingqinggou lead-zinc polymetallic deposit,Qinghai

迎庆沟铅锌多金属矿床是近年来青海祁漫塔格中西段探获的一处中型矿床。通过矿床地质特征研究,本文认为迎庆沟铅锌多金属矿床的成因类型为矽卡岩型;近EW向大规模逆冲断裂控制着迎庆沟铅锌多金属矿床的岩浆作用与成矿作用;其成矿地质作用主要体现在一系列从高温到低温的蚀变矿物组合和矿化分带,从内矽卡岩带→外矽卡岩带→远离矽卡岩带,呈现出由高温成矿元素向中低温成矿元素的逐渐过渡,并构成一套完整的矽卡岩成矿体系。

The Yingqinggou Pb-Zn medium-sized deposit is situated in the middle-west Qimantag metallogenic belt. From the ore exploration and study work,and summarizing the geological characteristics of the deposit,we think the Yingqinggou Pb-Zn medium-sized deposit is skarn-type deposit. The East-West direction large-scale fracture controled the magmatic activity and mineralization.The mineralization process including a series of altered mineral assemblage and mineralization zoning,from high temperature to low temperature. Moreover,from the inner skarn belt to external belt,the metallogenic elements exhibit characteristics from high-temperature to medium-low temperature,which constitute a complete skarn system.