分散元素镉的资源概况及其研究意义──来自牛角塘铅锌矿的线索

镉是一种分散元素，不易高度富集成矿，主要作为铅锌矿的伴生组分产出。我国拥有丰富的镉矿资源。牛角塘铅锌矿床高度富镉，矿石中的镉含量很少低于300×10－6，最高可达14300×10－6．闪锌矿中一般大干5000×10－6。镉的高度富集表明了镉在该矿区有着独特的地球化学行为，因而牛角也铅锌矿床是研究分散元素镉的地球化学行为的理想矿床。但是，镉的高度富集也是牛角塘地区环境的隐患（镉有剧毒）。故应采取合理的措施，以达到既充分利用矿产资源又不造成环境污染的目的。

RESOURCES SURVEY AND RESEARCH SIGNIFICANCE OF CADMIUM: A CLUE FROM NIUJIAOTANG Pb-Zn DEPOSIT, GUIZHOU PROVINCE

The dispersed element, cadmium, is sulphopile. It is difficult for Cd to be of high enrichment. As an associated element, Cd usually occurs in Pb-Zn ores and minerals. China is abundant in cadmium ore resources. Situated at the south most of the Pb-Zn belt in Southeast Guizhou, the Niujiaotang PbZn deposit is highly rich in Cd. The highest Cd content in the ore is 17590 x 10-6 and the content of Cd in sphalerite is lower than 5000 x 10 - 6. High enrichment of Cd in the deposit demonstrates that Cd has unique geochemical behavior. The Niujiaotang Pb-Zn deposit is a favorable deposit in studying the geochemical behavior of Cd. On the other hand, the high enrichment of Cd also brings about potential hazards to this region, even manufacturers and their surrounding environment. Rational measures to prevent environmental pollution are to be developed.