滇西北羊拉铜多金属矿床铅锌成矿作用初步研究
Primary study on lead-zinc mineralization of Yangla copper polymetallic deposit,northwest Yunnan province,China
查看参考文献114篇
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文摘
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羊拉铜矿床位于金沙江构造带中部,为滇西北地区最为典型的铜矿床,铅锌矿体为近年来的找矿新发现,铅锌成矿作用及其与铜矿体的成因联系成为亟待解决的科学问题。本文在野外坑道编录及室内岩矿鉴定的基础上,重点研究了铅锌矿体的稀土元素及C-O、S、Pb、Zn同位素地球化学。研究表明:①羊拉矿床的铅锌矿体主要为矽卡岩型,呈层状、似层状、脉状、透镜体状分布于矽卡岩型铜矿体的边缘,与矽卡岩型铜矿体共同产出,明显具分支复合、尖灭再现的特征;其次为热液脉型,呈不规则细脉状充填于构造破碎带内;与铅锌成矿作用相关的方解石可分为早阶段方解石(Ⅰ)和晚阶段方解石(Ⅱ)。②早成矿阶段方解石(Ⅰ)主要呈他形晶不规则团块状产出,ΣREE在24.05×10~(-6)~104.50×10~(-6)之间,δEu显示正异常、δCe显示弱负异常,稀土元素配分模式为轻稀土富集的右倾型曲线;δ~(13)C_(PDB)在-6.52‰~-4.07‰之间,δ~(18)O_(SMOW)在5.04‰~9.94‰之间,成矿物质主要来源于花岗岩质岩浆。晚成矿阶段方解石(Ⅱ)呈脉状产出,ΣREE在28.71×10~(-6)~114.60×10~(-6)之间,δEu显示正异常、δCe显示弱负异常,稀土元素配分模式为轻稀土富集的右倾型曲线;δ~(13)C_(PDB)在-3.81‰~-3.53‰之间,δ~(18)O_(SMOW)在14.36‰~17.30‰之间,成矿物质来自于花岗岩质岩浆与海相碳酸盐岩的混合。③早、晚成矿阶段方解石均为热液成因,其稀土元素并无明显差异。④38件硫化物的δ~(34)S在-2.48‰~2.32‰之间,总硫同位素接近于零值,表明成矿物质来源于地幔和深部地壳,属岩浆源硫。⑤15件硫化物的铅同位素变化范围小,~(208)Pb/~(204)Pb= 38.7501~38.7969,~(207)Pb/~(204)Pb=15.7159~15.7248,~(206)Pb/~(204)Pb=18.3640~18.3874,表明铅锌矿体中铅主要来源于上地壳。⑥5件闪锌矿Zn同位素的δ~(66)Zn_(JMC)值在0.31‰~0.44‰之间,明显大于其他矽卡岩型铅锌矿床,亦揭示成矿物质Zn主要来源于岩浆。⑦羊拉矿床矽卡岩型铅锌矿体与矽卡岩型铜矿体在赋矿层位、形态产状、矿物组合、矿石组构、围岩蚀变、控矿因素以及C-O、S、Pb同位素组成等方面均无明显差异,反映铅锌矿体与铜矿体均为矽卡岩成因,铅锌矿体的形成稍晚于铜矿体,分布于铜矿体的边缘。综合上述资料,本文建立了羊拉矿床铜铅锌成矿模式。 |
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其他语种文摘
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The Yangla copper deposit which is located in the middle of Jinshajiang tectonic belt,is the most typical copper deposit in the northwest of Yunnan province.In recent years,Pb-Zn orebodies were newly discovered in the depth of Yangla copper deposit,Pb-Zn orebodies mineralization and its genetic relationship with copper ore bodies have become a new scientific problem.In this paper,the rare earth elements and C-O,S,Pb and Zn isotopes geochemistry of Pb-Zn orebodies were mainly studied,on the basis of tunnel geological logging and rock-mineral identification.The Pb-Zn ore bodies of Yangla deposit are mainly of skarn type,which are distributed in the edge of skarn type copper bodies in the form of stratiform,irregular veins and lenticular,and co-produced with skarn type copper bodies.It is obviously characterized by branch-compound and ore bodies' reappearing after disappearing.The second is hydrothermal vein type,which filled in the structural fracture zone with irregular veinlike shape.Calcite associated with Pb-Zn orebodies can be divided into early mineralization stage calcite (Ⅰ) and late mineralization stage calcite (Ⅱ).The early mineralization stage calcite (Ⅰ) mainly occurs in the Pb-Zn orebodies in irregular clumps,and anhedraal crystal,ΣREE of calcite (Ⅰ) is between 24.05×10~(-6) and 104.50×10~(-6),δEu shows positive anomalies,δCe displays weak negative anomalies,chondrite-normalized REE patterns are LREE-rich.The δ~(13)C_(PDB) and δ~(18)O_(SMOW) of calcite (Ⅰ) are between -6.52‰--4.07‰ and 5.04‰-9.94‰,respectively,indicating that the metallogenic materials are mainly from granitic magma.The late mineralization stage calcite (Ⅱ) is produced veins in the Pb-Zn orebodies,ΣREE of calcite (Ⅱ) is between 28.71×10~(-6) and 114.60×10~(-6),δEu shows positive anomalies,δCe displays weak negative anomalies,chondrite-normalized REE patterns are LREE-rich.The δ~(13)C_(PDB) and δ~(18)O_(SMOW) of calcite (Ⅱ) are between -3.81‰--3.53‰ and 14.36‰-17.30‰,which proves that the ore-forming material comes from the mixing of granitic magma and marine carbonate rocks.Calcite in early and late metallogenic stages are of hydrothermal origin,and there is no significant difference in the content of rare earth elements.The δ~(34)S of sulfide (n=38) in Pb-Zn orebodies are between -2.48‰ and 2.32‰,total sulfur isotope is close to zero,indicating that the metallogenic materials are derived from mantle and deep crust.The lead isotopic variation range of sulfide (n=15) is small,the ~(208)Pb/~(204)Pb,~(207)Pb/~(204)Pb and ~(206)Pb/~(204)Pb range from 38.7501 to 38.7969,15.7159 to 15.7248,and 18.3640 to 18.3874,respectively,indicating that the lead in Pb-Zn orebodies mainly comes from the upper crust.The δ~(66)Zn_(JMC) of sphalerite (n=5) is between 0.31‰ and 0.44‰,which is obviously higher than other skarn type Pb-Zn deposits,and it also reveals that the metallogenic Zn mainly comes from magma.There is no significant difference between the Pb-Zn orebodies and Cu orebodies in terms of host-rock layers,orebodies attitude,mineral association,ore fabrics,wall rock alteration,ore-controlling factors and isotope composition of C-O,S,Pb,which shows that the Pb-Zn orebodies and the Cu orebodies are of the same origin and are the products of the same metallogenic process.Pb-Zn orebodies is later than the Cu orebodies,which is the product of the late metalogenic stage and distributed at the edge of Cu orebodies.Based on the above research data,the Cu-Pb-Zn metallogenic pattern of Yangla deposit is established in this paper. |
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来源
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中国有色金属学报
,2021,31(8):2279-2312 【核心库】
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DOI
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10.11817/j.ysxb.1004.0609.2021-35995
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关键词
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铅锌矿体
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方解石
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稀土元素
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同位素
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羊拉铜多金属矿床
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滇西北
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地址
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1.
昆明理工大学国土资源工程学院/有色金属矿产地质调查中心,西南地质调查所, 昆明, 650093
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550081
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中国有色金属工业昆明勘察设计研究院有限公司, 昆明, 650051
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云南迪庆矿业开发有限责任公司, 香格里拉, 674400
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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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1004-0609 |
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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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云南省万人计划青年拔尖人才资助项目
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昆明理工大学重点学科建设资助项目
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文献收藏号
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CSCD:7091123
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