广西老厂铅锌矿田方铅矿和闪锌矿微量元素特征及其成因探讨

FEATURES OF TRACE ELEMENTS OF GALENA AND SPHALERITE IN LAOCHANG Pb-Zn OREFIELD OF GUANGXI AND DISCUSSION ON ITS GENESIS

老厂铅锌矿床不同成因类型矿脉中的方铅矿、闪锌矿微量元素组成有明显差别。石英方铅矿脉的方铅矿以高Ａｇ、Ｓｂ、Ｓｎ和低Ｇｅ、Ｃｄ、Ｔｅ为特征，与区域上典型岩桨热液矿床相一致。与闪锌矿共生的方铅矿则以低Ａｇ、Ｓｂ、Ｓｎ和高Ｇｅ、Ｃｄ、Ｔｅ为特征。所有闪锌矿以低Ｆｅ、Ｍｎ、Ｉｎ、Ａｇ、Ｓｎ和高Ｇａ、Ｇｅ为特征，均与国内典型的沉积改造型矿床相一致。根据这些特征可把本区叠加在一起的不同成因类型矿床区分开来。因此，老厂地区铅锌矿床中的方铅矿、闪锌矿的特征元素含量及其比值，可作为区分本区不同成因类型铅锌矿床的重要地球化学标志。

The composition of trace elements of galena and sph3lerite in the ore veins of differentkinds of geneses differs obviously from each other in Laochang Pb-Zn deposit．The galena fromquartz-galena veins is high in Ag，Sb and Sn and low in Ge，Ce and Te， regionally conformingto that of typical magmatic hydrothermal deposit．Whereas the galena paragenetic with spha-lerite is low in Ag，Sb，Sn and high in Ge，Cd and Te. All sphalerites of various geneses arelow in Fe，Mn，In，Ag，Sn and high in Ga，and Ge，in line with the typical sedimentary-reformed deposits in China. According to the above features，the superimposition deposits ofdefferent kinds of geneses are charecteristic elements of galena and sphalerite in Laochang Pb-Zn deposit can used as a geochemical criterion for distinguishing Pn-Zn deposits of differentkinds of geneses in the area.