四川乌依铅矿床锗镉元素赋存规律研究及意义

A Study on Occurrence Regularity of Elements Germanium-cadmium in Wuyi Lead Deposit and Its Implications in Sichuan Province,China

乌依铅矿床矿石矿物以方铅矿为主,含闪锌矿和黄铁矿,偶见黝铜矿,以脉状和网脉状构造为主,以重晶石化和碳酸盐化为主的围岩蚀变。电子探针微区分析表明,镉锗元素主要以类质同象形式赋存于闪锌矿中,闪锌矿中Zn与Cd成正相关,而Zn与Fe呈负消长关系;Cu元素富集在方铅矿中(0.001×10^(-2)~0.083×10^(-2)),而黝铜矿中富集Ag高达1.1%。单矿物方铅矿化学分析表明Pb元素平均含量为84.56%,S元素平均含量为14.24%,Ag含量达到53.3~76.3 g/t,但Ge、Cd含量较低。闪锌矿Zn/Cd<500及方铅矿500>Zn/Cd>50,暗示乌依铅矿床形成于低温环境,与包裹体测温结果基本一致。综合硫、铅同位素,该矿床为典型的密西西比河型铅锌矿床,为该地区寻找相似矿床和元素综合利用提供指导作用。

The major Ore mineral of Wuyi lead deposit is galena,little sphalerite and pyrite,and rare tetrahedrite. Ore deposit possessed typical vein and mesh-vein structures and barite-carbonization of wall rock alteration.Electron probe microanalysis（ EPMA） showed that the elements Cd and Ge mainly exists in the form of isomorphism in sphalerite. The elements Cd and Zn are positive correlation relationship,and the elements Fe and Zn are negative correlation relationship. The elements Cu is enrich in galena from 0. 001 × 10^-2to 0. 083 × 10^-2,and the element Ag is enrich as high as 1. 1% in tetrahedrite. Chemical analysis showed that the average content of the elements Pb is 84. 56% and S is 14. 24% in Galena. The content of the elements Ag ranged from 53. 3 to 76. 3 g / t,and the contents of the elements Ge and Cd is lower content in Galena. Zn / Cd 500 in sphalerite and 500 Zn / Cd 50 in galena of Wuyi lead deposit imply that it formed in low temperature environment,Consistent with the temperature of fluid inclusion. Analysis the sulfur with lead isotopes by synthesis,It is a typical of the Mississippi River type Pb-Zn deposit,and exploring similar ore deposits in this area and provide guidance to the elements comprehensive utilization.