摘要
鄂西南地区铅锌矿化分布广泛,但至今未发现大型矿床,对成矿系统的研究亦存在不足。对来凤革勒车地区铅锌-萤石矿流体包裹体进行了显微测温及C-H-O-S-Pb同位素测试分析。结果表明:区内萤石、方解石流体包裹体均一温度集中在137~170℃之间,盐度变化范围为11.46%~16.89%,属低温度、中低盐度NaCl-H_(2)O体系流体,主要来源可能为含沉积硫酸盐(海相沉积物)的岩石建造变质脱水;δ^(34)S值介于9.5‰~11.8‰之间,均值为10.92‰;^(206)Pb/^(204)Pb<18.20,^(207)Pb/^(204)Pb>15.60,^(208)Pb/^(204)Pb<39.00,铅同位素具有比值变化小,具有高μ和高ω的特征。硫源和铅源均主要来自于上地壳古生代沉积盆地奥陶纪和寒武纪容矿地层,同生沉积成岩后生中低温热液改造作用是革勒车地区铅锌-萤石矿床的主导成因类型。与鄂湘西扬子地台区典型铅锌矿床进行对比发现,它们具有较大的相似性,同时在成矿流体、古生代沉积环境、构造背景3个方面具有明显的差异性。
[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.[Methods]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 temperature of fluid inclusions in fluorite and calcite is concentrated between 137-170℃,and the variation range of salinity is 11.46%-16.89%.It is a NaCl-H_(2)O system with low temperature and medium and low salinity.The main source may be metamorphic dehydration of rock formations containing sedimentary sulfate(marine sediments).Theδ^(34)S content ranges from 9.5‰to 11.8‰,with an average of 10.92‰.^(206)Pb/^(204)Pb<18.20,^(207)Pb/^(204)Pb>15.60,and ^(208)Pb/^(204)Pb<39.00,and the floating ratio is small and highμand highω.[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 transformation 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.
作者
罗华
郭盼
刘力
潘龙克
段先锋
毛启曦
廖明芳
LUO Hua;GUO Pan;LIU Li;PAN Longke;DUAN Xianfeng;MAO Qixi;LIAO Mingfang(Hubei Geological Survey,Wuhan 430034,China;Hubei Provincial Key Laboratory of Resource and Ecological Environment Geology,Wuhan 430034,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第1期39-50,共12页
Bulletin of Geological Science and Technology
基金
中国地质调查局项目(DD20160029-15)。
关键词
同位素
铅锌
萤石
物质来源
鄂西南
流体包裹体
isotope
lead and zinc
fluorite
material source
southwestern Hubei
fluid inclusion
