矿床地质2017，Vol.36Issue(2)：330-344,15.DOI:10.16111/j.0258-7106.2017.02.005
贵州铜仁塘边铅锌矿床成因的流体包裹体和同位素证据
Ore genesis of Tangbian Pb-Zn deposit in Tongren, Guizhou: Evidence from ore-forming fluids and isotopes
摘要
Abstract
The Tangbian Pb-Zn deposit is located in the southeast of Yangtze landmass.It is adjacent to the famous Huayuan Pb-Zn orefield.The orebody,occurs in algal limestone of Lower Cambrian Qingxudong Formation,showing layered and bedded forms.Sphalerite and galena are the main ore minerals.Systematical study of fluid inclusions in sphalerite and calcite associated with mineralization was conducted through the analysis of homogenization temperatures,salinity,gas compositions,liquid compositions by heating/freezing system,and C,H,O isotopes of calcite were also analyzed in this paper.The results show that the ore-forming fluid is characterized by low temperature of 92～～193℃,relatively high salinity of 8.9 ％ ～21.2 ％ and relatively high density of 0.98 ～～1.1 g/cm3.The cations in the fluid inclusions are mainly Ca2+,Mg2+,Na+ and K+,while the anions are mainly CI-,NO3-,F-and Br-.The gas compositions of fluid inclusions are N2,H2O,CO2,O2 and a small amount of reducing gas such as CH4.The δ13Cv-PDB,δ18Ov-SMow and δDv-SMow of calcites are respectively from -0.5‰ to 1.5‰,from 21.2‰ to 25.1‰ and from-93‰～～-57‰,with δ18Ofluid values of ore-forming fluid being from 8.8‰ to 12.7‰.According to the above result,the authors believe that the ore-forming fluid had the feature of multi-source,and there were ancient seawater,formation water,metamorphic water,organic water and a little rainwater.Based on a comparison of the Tangbian Pb-Zn deposit with the sediment-hosted base metal sulfide deposits in the world,the authors classified the Tangbian Pb-Zn deposit as the MVT Pb-Zn deposit.On such a basis and according to previous studies,the relationship between Pb-Zn mineralization and evolution of the Hunan-Guizhou fault zone was discussed.关键词
地球化学/流体包裹体/同位素/MVT型铅锌矿床/塘边铅锌矿床/贵州铜仁Key words
geochemistry/fluid inclusions/isotope/MVT type Pb-Zn deposit/Tangbian Pb-Zn deposit/Tongren/Guizhou分类
天文与地球科学引用本文复制引用
于玉帅,郭福生,戴平云,刘阿睢,周云..贵州铜仁塘边铅锌矿床成因的流体包裹体和同位素证据[J].矿床地质,2017,36(2):330-344,15.基金项目
本文得到国家自然科学基金项目(编号:41503040)、中国地质调查局地质调查项目(编号:DD20160029,1212011120789)和东华理工大学核资源与环境教育部重点实验室开放基金项目(编号:NRE1206)资助 （编号:41503040）
