云南富盛铅锌矿床闪锌矿硫、铅、锌、镉同位素特征及其指示意义  

Characteristics of sulfur,lead,zinc and cadmium isotopes of sphalerites in the Fusheng Pb-Zn deposit in Yunnan Province and their indicative significances

作　　者：许冲 钟宏[4] 朱维光[4] 唐亮 宋长顺 罗光杰 XU Chong;ZHONG Hong;ZHU Wei-guang;TANG Liang;SONG Chang-shun;LUO Guang-jie(School of Geography and Resources,Guizhou Education University,Guiyang 550018,China;Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed,Guizhou Education University,Guiyang 550018,China;Institute of Guizhou Mountain,Guizhou Education University,Guiyang 550018,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]贵州师范学院地理与资源学院,贵州贵阳550018 [2]贵州师范学院贵州省流域地理国情监测重点实验室,贵州贵阳550018 [3]贵州师范学院贵州山地研究院,贵州贵阳550018 [4]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550081

出　　处：《矿物学报》2022年第6期732-744,共13页Acta Mineralogica Sinica

基　　金：贵州省基础研究计划项目(编号:黔科合基础-ZK[2022]一般336);贵州师范学院博士项目(编号:校2021009)。

摘　　要：富盛铅锌矿床位于川滇黔铅锌矿集区东南部,与富乐铅锌矿床(大型)邻近。矿体赋存于下二叠统茅口组(P_(1)m)白云质灰岩或白云岩中,矿体形态为似层状和透镜状。矿物组合简单,主要为闪锌矿、方铅矿、黄铁矿、方解石和白云石。矿石构造主要为角砾状、块状、浸染状和脉状构造,矿石结构以半自形-自形粒状结构和半自形-他形粒状结构为主。富盛铅锌矿床的硫化物(方铅矿、闪锌矿)矿物的δ^(34)S值变化范围为+9.2‰~+15.9‰;闪锌矿单矿物的^(206)Pb/^(204)Pb、^(207)Pb/^(204)Pb和^(208)Pb/^(204)Pb组成范围分别为:18.5637~18.6078、15.6887~15.6939和38.563~38.586;闪锌矿单矿物δ^(66)Zn和δ^(114)Cd值变化范围分别为:+0.09‰~+0.33‰和+0.07‰~+0.53‰。结合前人研究成果,本文得出以下结论:1)富盛铅锌矿床的硫主要来源于沉积地层中的蒸发岩或海水硫酸盐岩的热化学还原作用;2)富盛铅锌矿床的铅和锌主要来源于元古界基底地层,但不排除有少部分锌来源于震旦系-二叠系地层沉积岩;3)富盛铅锌矿床应属于MVT铅锌矿床,其矿床成因及成矿模式均可对比MVT铅锌矿床来解释。The Fusheng Pb-Zn deposit is located in the southeastern part of the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province.It is close to the Fule Pb-Zn deposit(large sized).Its ore bodies occurred in the dolomitic limestone or dolomite of the Lower Permian Maokou Formation(P_(1)m)in forms of stratiform-like and lenticular ones.The mineral assemblage of ore is relatively simple,with main minerals of sphalerite,galena,pyrite,calcite and dolomite.Sulfide ores mainly have brecciated,massive,disseminated and veined structures,and main subhedral-euhedral and subhedral-anhedral granular textures.The δ^(34)S values of the sulfides(galena,sphalerite)in the Fusheng Pb-Zn deposit vary from +9.2‰to +15.9‰.Sphalerite separates have ^(206)Pb/^(204)Pb,^(207)Pb/^(204)Pb and ^(208)Pb/^(204)Pb ratios of 18.5637~18.6078,15.6887~15.6939 and 38.563~38.586,respectively;and have δ^(66)Zn and δ^(114)Cd values of +0.09‰~+0.33‰ and+0.07‰~+0.53‰,respectively.Combined with previous research results,following conclusions have been given in this paper.(1)The sulfur in the Fusheng Pb-Zn deposit was mainly sourced from the thermochemical sulphate reduction(TSR)of evaporite or seawater sulfate-rich rocks in the sedimentary strata.(2)The lead and zinc of the Fusheng Pb-Zn deposit were mainly derived from the Proterozoic basement strata.However,it cannot be ruled out that a small part of zinc could be sourced from Sinian-Permian stratigraphic sedimentary rocks.(3)The Fusheng Pb-Zn deposit should belong to the MVT-type Pb-Zn deposit,and its metallogenic genesis and model can be explained based on the comparative study of the MVT-type Pb-Zn deposits.

关 键 词：富盛铅锌矿床 S-Pb-Zn-Cd同位素 成矿物质来源 川滇黔铅锌矿集区 

分 类 号：P597[天文地球—地球化学] P618.4[天文地球—地质学]