Fluid inclusion and C-H-O-S-Pb isotope characteristics and geological sig-nificance of lead-zinc-fluorite deposits in the Geleche area,Laifeng,Hubei Province
Fluid inclusion and C-H-O-S-Pb isotope characteristics and geological sig-nificance of lead-zinc-fluorite deposits in the Geleche area,Laifeng,Hubei Province
[Objective]Lead-zinc mineralization is widely distributed in southwestern Hubei Province,but no large deposits have been found thus far,and there is a lack of systematic studies on metallogenic systems.[Meth-ods]The C-H-O-S-Pb isotope analysis and the homogenization temperature of fluid inclusions of lead-zinc-fluorite ore in the Geleche area of Laifeng were conducted.[Results]The results show that the homogenization tempera-ture of fluid inclusions in fluorite and calcite is concentrated between 137-170 ℃,and the variation range of salini-ty is 11.46％-16.89％.It is a NaCl-H2O system with low temperature and medium and low salinity.The main source may be metamorphic dehydration of rock formations containing sedimentary sulfate(marine sediments).Theδ34S content ranges from 9.5‰ to 11.8‰,with an average of 10.92‰.206Pb/204Pb＜18.20,207Pb/204Pb＞15.60,and 208Pb/204Pb＜39.00,and the floating ratio is small and high μ and high ω.[Conclusion]The sulfur and lead sources are mainly from the Ordovician and Cambrian ore-bearing strata in the Paleozoic sedimentary basin of the upper crust.Syngenetic sedimentary diagenesis and epigenetic medium-and low-temperature hydrothermal transfor-mation are the dominant genetic types of the Geleche mining area.Compared with the typical lead-zinc deposits in the Yangtze Platform of West Hubei and Hunan,they have great similarity and obvious differences in metallogenic fluid,Paleozoic sedimentary environment and tectonic background.
关键词
同位素/铅锌/萤石/物质来源/鄂西南/流体包裹体
Key words
isotope/lead and zinc/fluorite/material source/southwestern Hubei/fluid inclusion
维普
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