地质通报2017，Vol.36Issue(5)：885-892,8.
贵州铜仁塘边铅锌矿床成矿时代和成矿物质来源——来自Rb-Sr同位素测年和S-Pb同位素的证据
The metallogenic epoch and ore-forming material source of the Tang? bian Pb-Zn deposit in Tongren, Guizhou Province:Evidence from Rb-Sr dating of sphalerites and S-Pb isotope
摘要
Abstract
Rb-Sr dating of sphalerite, sulfur and lead isotopes of sulfides was analyzed to confirm the age of mineralization and to de?termine the origin of the ore-forming material. The Rb-Sr dating of sphalerite from the Tangbian deposit yielded an isochron age of 477±5Ma(MSWD=1.2), which is in agreement with the isochron age of 486±6Ma from the Bukouchang deposit in the range of er?ror, suggesting that the mineralization of Pb-Zn occurred in the early Ordouician. δ34S values of pyrite, galena and sphalerite range from+25.2‰to+36.1‰, similar to data obtained by previous studies of other sediments-hosted Pb-Zn deposits in eastern Guizhou and western Hu'nan. It is held that the sulfur of the Tangbian Pb-Zn deposit originated from marine sulfates and/or underlying star?ta. Lead isotope analysis of galena and sphalerite yielded 208Pb/204Pb ratios varying from 38.389 to 38.584, 207Pb/204Pb ratios varying from 15.737 to 15.790, and 206Pb/204Pb ratios varying from 18.181 to 18.217, with relative highμvalues from 9.75 to 9.86. The re?sults suggest that the source of lead was mainly derived from the upper crust. Besides, some data of lead isotope point to magmatic source, which probably resulted from the extraction of lead by the ore-forming fluids from magmatic rocks.关键词
Rb-Sr定年/S-Pb同位素/成矿时代/成矿物质来源/塘边铅锌矿Key words
Rb-Sr dating/S-Pb isotope/metallogenic epoch/origin of ore-forming matter/Tangbian Pb-Zn deposit分类
天文与地球科学引用本文复制引用
于玉帅,刘阿睢,戴平云,赵武强,陶明,刘重芃..贵州铜仁塘边铅锌矿床成矿时代和成矿物质来源——来自Rb-Sr同位素测年和S-Pb同位素的证据[J].地质通报,2017,36(5):885-892,8.基金项目
国家重点研发计划《华南陆内成矿系统的深部过程与物质响应》(编号:2016YFC0600205)、中国地质调查局项目《湘西-鄂西成矿带神农架—花垣地区地质矿产调查》(编号:DD20160029、121201009000160901)和东华理工大学核资源与环境国家重点实验室培育基地基金项目《贵州铜仁地区塘边铅锌矿矿床成因研究》(编号:NRE1206) （编号:2016YFC0600205）
