中文摘要：

天桥铅锌矿床位于川-滇-黔铅锌成矿带中东部,为黔西北地区铅锌矿床的典型代表之一。长期以来,对该矿床的成因认识存在较多争议,前人的研究主要集中在分散元素的富集规律、稀土元素及同位素对成矿流体来源的指示意义等方面,对天桥矿床中闪锌矿的微量元素特征缺乏系统的研究。本文应用ICP-MS对天桥矿床中闪锌矿的微量元素进行测试分析,研究结果表明,该矿床中闪锌矿的微量元素具有富Ge、Ga贫Mn、In、Sn、Cd的特征,其微量元素富集规律明显与夕卡岩型、喷流沉积型及岩浆热液型铅锌矿床不同,而与典型MVT型矿床（如勐兴、牛角塘等矿床）非常类似,仅其中Cd含量较低（均值为1282×10-6）,该特征与川滇黔地区MVT型铅锌矿床（会泽和杉树林）中闪锌矿微量元素组成一致。总体上,本矿床闪锌矿富集Ge和Ga等低温成矿元素,其In/Ga比值中等,Zn/Cd比值较高,暗示其形成于中温环境。综合前人研究成果及矿床产出地质特征,我们认为天桥铅锌矿床属于MVT型铅锌矿床。

英文摘要：

The Tianqiao Pb-Zn deposit, located in the eastern part of the Sichuan-Yunnan-Guizhou Pb-Zn mineralization province, is a representative middle-sized Pb-Zn deposit in north-western Guizhou Province, P.R. China. There are different viewpoints about its genesis; most scientists mainly focus on the accumulation regulation of dispersed elements, characteristics of rare earth elements and isotope geochemistry, to study the genesis of the deposit. Few researchers have examined trace elements in sphalerite. Using ICP-MS, trace elements in sphalerite were analysed in this study. Results show that sphalerite is rich in Ge and Ga and poor in Mn, In, Sn and Cd, with a higher Zn/Cd ratio, which is clearly different from that of skarn-type, SEDEX-type and magmatic hydrothermal-type. However, it similar to sphalerite from classical MVT deposits（i.e. Mengxing and Niujiaotang deposit, etc.）, except that the concentration of Cd（about 1282×10^（-6）） is relatively lower, as compared to the Huize and Shanshulin Pb-Zn deposits in the same region. It is suggested that the Tianqiao Pb-Zn deposit belongs to a MVT Pb-Zn deposit, and formed at medium temperature.