湘东北地区栗山铅锌铜多金属矿床的成因探讨:来自矿床地质、矿物学和硫同位素的证据
Genesis of the Lishan Pb-Zn-Cu polymetallic deposit in northeastern Hunan province: evidences from the geology, mineralogy and sulfur isotopes
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文摘
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湘东北大型栗山铅锌铜多金属矿床位于幕阜山岩体边部,矿体赋存于岩体及其内外接触带中的硅化构造角砾岩带内.根据野外调查和显微岩(矿)相学观察,可将栗山矿床的主成矿期——热液成矿期划分为四个阶段:粗粒石英+萤石+绿泥石$\left( {{\rm{Ch}}{{\rm{l}}_{\rm{I}}}} \right)$+少量黄铁矿+黄铜矿阶段(I )、石英+萤石+绿泥石$\left( {{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}} \right)$ +黄铜矿+黄铁矿阶段(Ⅱ)、石英+萤石+绿泥石$\left( {{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}} \right)$.闪锌矿+黄铜矿+方铅矿阶段(Ⅲ)、细粒石英+少量黄铜矿+黄铁矿细脉阶段(Ⅳ). EPMA分析结果表明${{\rm{Ch}}{{\rm{l}}_{\rm{I}}}}$为蠕绿泥石,${{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}}$|和${{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}}$为鲕绿泥石一铁镁绿泥石.根据绿泥石温度计,估算出阶段I, Ⅱ,Ⅲ的成矿温度分别为239 ℃~280 ℃,221 ℃-261 ℃和212 ℃~238 ℃.结合闪锌矿硫逸度计算,表明栗山矿床形成于中温、低氧逸度、低硫逸度的环境.硫化物的${{\rm{\delta }}^{34}}$S(-4.7‰~1.5‰)变化较小且接近零值,表明成矿流体主要来源于岩浆热液.通过与钦杭成矿带上典型的铅锌矿床对比,提出栗山矿床为与岩浆热液有关的中温热液充填交代成因. |
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其他语种文摘
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The northeastern Hunan province is located at the central segment of the Jiangnan Orogen known as an economically important Au-Sb-W-Cu polymetallic metallogenic belt. Recently, several Co, Cu, Pb-Zn polymetallic deposits were discovered in northeastern Hunan Province,and they all have a close spatial relationship with the Yanshanian plutons. Among these deposits,the Lishan Pb-Zn-Cu polymetallic deposit occurs within the Mufushan pluton and its contact zone,with orebodies hosted within altered fracture zones. Based on the detailed field investigation and microscopic observation,the Lishan Pb-Zn-Cu polymetallic mineralization can be divided into two epochs:hydrothermal mineralization and supergene enrichment. Furthermore,hydrothermalism can further be subdivided into four stages: coarse quartz + fluorite + chlorite $\left( {{\rm{Ch}}{{\rm{l}}_{\rm{I}}}} \right)$ + minor pyrite + chalcopyrite stage (I),quartz + fluorite + chlorite$\left( {{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}} \right)$ + chalcopyrite + pyrite stage(Ⅱ),quartz+fluorite+chlorite $\left( {{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}} \right)$ + sphalerite + chalcopyrite + galena stage(Ⅲ), and fine-grained quartz+minor pyrite+ chalcopyrite stage (IV),from early to late. The EPMA analyses show that ${{\rm{Ch}}{{\rm{l}}_{\rm{I}}}}$ belongs to ripidolite,and that ${{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}}$ and ${{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}}$ are dominated by daphnite and brunsvigite. The empirical geothermometers of chlorite yield temperatures of 239℃~280℃(av.255℃),221℃~261 ℃ (av.244 ℃)and212℃~238 ℃ (av.231 ℃) for ${{\rm{Ch}}{{\rm{l}}_{\rm{I}}}}$,${{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}}$ and ${{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}}$,respectively,showing a decreasing trend. The estimated oxygen fugacities $\lg f\left( {{{\rm{O}}_2}} \right)$ and sulfur fugacities $\lg f\left( {{{\rm{O}}_2}} \right)$ are -39.90~-34.77 and 0.22~8.41,—42.29~-37.51 and-3.25 ~4.25,and - 43.71 ~-39.08 and —2.88 ~1.47 for ${{\rm{Ch}}{{\rm{l}}_{\rm{I}}}}$, ${{\rm{Ch}}{{\rm{l}}_{{\rm{II}}}}}$ and ${{\rm{Ch}}{{\rm{l}}_{{\rm{III}}}}}$,respectively,suggesting an environment of low oxygen fugacity and low sulfur fugacity. Sphalerite and galena yield ${{\rm{\delta }}^{34}}$ S values of -4.7‰ to 1.5‰,suggesting a predominant magmatic sulfur origin. Integrating the geological, mineralogical and sulfur isotopic data documented in this study,as well as the contrast with typical Pb-Zn deposits within the Qin-Hang metallogenic belt,we propose that the Lishan Pb-Zn-Cu polymetallic deposit formed from a hydrothermal system related to the Mufushan pluton,and is of medium-temperature hydrothermal fracture filling type. |
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来源
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南京大学学报. 自然科学版
,2018,54(2):366-385 【核心库】
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DOI
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10.13232/j.cnki.jnju.2018.02.011
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关键词
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中温热液充填交代型矿床
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栗山铅锌铜多金属矿床
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幕阜山岩体
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湘东北地区
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地址
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1.
中南大学, 有色金属成矿预测与地质环境监测教育部重点实验室, 长沙, 410083
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中南大学地球科学与信息物理学院, 长沙, 410083
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广州, 510640
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湖南省地质矿产勘查开发局402队, 长沙, 410004
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湖南省地质测试研究院, 长沙, 410007
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0469-5097 |
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学科
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地质学 |
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基金
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国家自然科学基金
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科技部国家重点研发计划
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湖南省自然科学基金
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文献收藏号
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CSCD:6209872
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