桂林理工大学学报2017，Vol.37Issue(1)：13-20,8.DOI:10.3969/j.issn.1674-9057.2017.01.002
湘西凤凰民稿铅锌矿床流体包裹体地球化学特征
Geochemical characteristics of fluid inclusions from Mingao Pb-Zn deposit in Fenghuang County, Western Hunan
摘要
Abstract
Fluid inclusions in the mineralization calcite were studied from the Mingao Pb-Zn deposit,based on predecessors researches.Through the analysis of homogenization temperature,salinity,gas compositions,liquid compositions by heating/freezing system,hydrogen and oxygen isotopic compositions,it shows that the temperature of ore-forming fluid is mostly ranging from 150 to 200 ℃,the salinity is always greater than 11％,the density is generally about 1 g/cm3,the mineralization pressure is about (195.3-215.8) × 105 Pa,and the mineralization depth varies from 737 to 814 m.The ore-forming fluid is highly concentrated in solution containing mainly sodium and calcium chloride.It belongs to the low temperature,high salinity,high density and mineralized underground hot brine.The gas component of fluid inclusion is dominated by H2O and CO2,and also has little CH4 and H2.The positive ions in fluid inclusions are mainly Ca2+,Na + and secondly Mg2+,K +.The main negative ions are Cl-,SO42-with a fraction of F-,NO3-.The results of hydrogen and oxygen isotopic compositions imply that the origin of ore-forming fluid is related to formation water,with possible infiltration of rainwater and metamorphic water.CO2 and CH4 are widespread in the fluid inclusions,indicating that the mineralization is probably related to organic matter.The organic matter in the ore-controlling structure leads to the reduction of sulfate and the deposition of lead and zinc ore.关键词
铅锌矿/地球化学/流体包裹体/氢-氧同位素/湘西Key words
Pb-Zn deposit/geochemistry/fluid inclusion/hydrogen-oxygen isotope/western Hunan分类
天文与地球科学引用本文复制引用
梁恩云,彭能立,彭云益,刘耀荣,刘庚寅..湘西凤凰民稿铅锌矿床流体包裹体地球化学特征[J].桂林理工大学学报,2017,37(1):13-20,8.基金项目
中国地质调查局地质调查项目(1212011120781 （）
1212011220510 （）
12120114066201) （）
湖南省探矿权采矿权价款地质勘查项目(201303068) （201303068）
