中文摘要：

黔西北铅锌成矿区多数矿床矿石硫化物中富集多种分散元素（如cd、Ge、se、In和Ga等），特别是cd的含量最高，达2906X10^6。利用电子探针（EPMA）和电感耦合等离子体质谱（ICP—MS）等先进分析设备，初步查明了本区代表性矿床矿石硫化物中分散元素cd的赋存状态及富集规律：cd主要以类质同象形式赋存于金属硫化物相中，特别是闪锌矿中；其富集规律为闪锌矿cd含量最高，其次为方铅矿，最低为黄铁矿。研究发现闪锌矿中Cd含量与其zn含量并不呈类质同象的负相关特征，而是呈明显的正相关关系，并与闪锌矿中Fe含量呈“双曲线”的相关趋势，这一特征表明cd在闪锌矿中富集可能是通过替代其中的Fe实现的，研究认为是流体混合结果，这可能代表一种新的富集成矿机制。

英文摘要：

Many dispersed elements （such as Cd, Ge, Se, In and Ga, ete） are enrichment in the sulfides of the Pb- Zn metallogenetic area in the northwest of Guizhou Province, China, especially the content of Cd being the highest, up to 2906 x 10^6. In this paper, the occurrence states, regularities and mechanism of dispersed element Cd were studied by using the Electron Probe Mieroanalysis （EPMA） and Inductively Coupled Plasma Mass Spectrometry （ICP-MS） , which shows that the Cd is in the form of isomorphism occurring in the sulfide phase mainly, especially the sphalerite and the accumulation regularities of Cd being the highest in sphalerite, followed by galena, and pyrite being the minimum. It is also found that the relationship between the contents of Cd and the contents of Zn in sphal- erite has a positive correlation, but not negative correlation of isomorphous substitution, and the contents of Cd and the contents of Fe in sphalerite are in ＂hyperbolic＂ related trends. These features indicate that the Fe could be re- placed by Cd in sphalerite, which is the result of ＂fluids-mixing＂, maybe representing a new ore-forming mecha- nism.