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伍静,农仕华,黄文婷,张健,梁华英,苑金涛,陈玲. 2018. 广西五圩矿田三排洞矿床Sb-Au与Pb-Zn-Sb矿化地质地球化学特征与复合成矿分析. 岩石学报, 34(5): 1327-1334
广西五圩矿田三排洞矿床Sb-Au与Pb-Zn-Sb矿化地质地球化学特征与复合成矿分析
作者单位E-mail
伍静 广西大学资源环境与材料学院, 南宁 530004
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 
 
农仕华 广西大学资源环境与材料学院, 南宁 530004  
黄文婷 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  
张健 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
中国科学院大学, 北京 100049 
 
梁华英 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 lianghy@gig.ac.cn 
苑金涛 广西大学资源环境与材料学院, 南宁 530004  
陈玲 钦州学院广西北部湾海洋灾害研究重点实验室, 钦州 535011  
基金项目:本文受"973"项目(2015CB452602)和国家自然科学基金项目(41772065、41421062)联合资助.
摘要:
      广西丹池成矿带五圩矿田三排洞矿床由早期Sb-Au矿化和晚期Pb-Zn-Sb矿化组成,而五圩矿田其它矿床则仅见Pb-Zn-Sb矿化。本文对比分析了三排洞矿床两类矿化控矿构造产状、包裹体均一温度、盐度、气液相组成、矿物组合、闪锌矿铁含量等差异,探讨两类矿化成因联系,论证其是否为复合成矿作用形成的矿床。早期Sb-Au矿化主要产于走向320°断裂带中,矿体倾向NE,倾角50°~60°,主要由辉锑矿、雄雌黄、辰砂及自然金组成(Au>2×10-6),银含量低(<20×10-6);Pb-Zn-Sb矿化产于走向350°断裂带中,矿脉倾向SWW,倾角70°~80°,主要由闪锌矿、脆硫锑铅矿、特硫锑铅矿、硫锑铅矿等组成,富银(>100×10-6),贫金(<0.1×10-6)。早期和晚期矿化脉中流体包裹体温度峰值分别在160~200℃和180~230℃之间,富CO2包裹体数占总包裹体数分别约为8%和45%;早期和晚期矿化闪锌矿Fe含量分别为小于0.12%和在1.40%~3.65%之间;早期矿化锑矿物主要为辉锑矿,晚期矿化锑矿物则主要为脆硫锑铅矿、特硫锑铅矿及硫锑铅矿。上述差异表明早期矿化成矿热液具Sb-Au-As-Hg元素组合,相对贫CO2及Fe,而晚期矿化成矿流体具Pb-Zn-Sb-Ag元素组合,富CO2及Fe。据五圩矿田其它Pb-Zn-Sb矿床未发生Au成矿作用、三排洞矿床两期矿化受控于不同产状断裂构造、晚期矿化成矿温度高于早期矿化成矿温度、两期矿化成矿热液元素组成尤其是Au和Ag含量及CO2含量的明显差异等,可以认为三排洞矿床早期Sb-Au和晚期Pb-Zn-Sb矿化为不同成矿作用的产物,两者没有成因联系,三排洞矿床发生了复合成矿作用。同一矿区不同成矿作用可形成不同元素组合矿体。
英文摘要:
      The Sanpaidong polymetal deposit in the Danchi ore zone consists of Pb-Zn-Sb and Sb-Au ore bodies. Here the faults controlling occurrences of ore bodies, homogeneity temperature, salinity and gas composition of fluid inclusions, iron content in sphalerite, mineral assemblage of the two different types of mineralization are comparative analyzed to elucidate if the two different types of mineralization are genetic related or not. The Sb-Au mineralization which was cut through by the Pb-Zn-Sb mineralization occurs in the faults striking 320° and dipping NE with angles varying from 50°~60°, while the Pb-Zn-Sb mineralization was controlled by faults striking 350° and dipping SWW with angles about 70°~80°. The primary fluid inclusions in quartz from the early stage Sb-Au mineralization have peak value interval of homogenization temperature varying from 160~200℃, with salinity in the main range of 3.5%~5.5% NaCleqv, while the primary fluid inclusions in sphalerite from the late stage of Pb-Zn-Sb mineralization have the peak value interval of homogenization temperature varying from 180℃ to 230℃ with salinity in the range of 8%~10% NaCleqv. The ore forming fluid of the early stage Sb-Au mineralization is poor in CO2, while the ore forming fluid of the second stage Pb-Zn-Sb mineralization rich in CO2; Sphalerite from the early and late stage mineralization has Fe content less than 0.12% and in the range of 1.4%~3.65%, respectively, suggesting that the late stage mineralization of ore forming fluids contain high concentration of iron given their mineralization temperature is similar to each other. The early and late stage antimony minerals differ greatly from each other, antimony mineral of early stage mineralization is mainly stibnite, while the late stage jamesonite, twinnite and boulangerite, suggesting that the early and late stage main mineralization were formed in different geochemical environment. The above differences between the early and late stage mineralization in Fe content in sphalerite, gas composition of fluid inclusions, and element association suggest that the early stage ore forming fluid has element assemblage of Sb-Au-As-Hg characterized by low concentration of Fe and CO2, while the second stage ore forming fluid has element assemblage of Pb-Zn-Sb-Ag characterized by high concentration of Fe and CO2. Based on that the other Pb-Zn-Sb deposits in the Wuxu ore field do not underwent Sb-Au mineralization, the mineralized temperature of second stage mineralization is a little higher than the early stage mineralization, the early stage Sb-Au and late stage Pb-Zn-Sb mineralization occurred in different faults with different occurrences, respectively, and that the ore forming fluids of early and late stage mineralization differs greatly in element association and gas composition, it is suggested that the early stage Sb-Au and late stage Pb-Zn-Sb mineralization is not genetic related and the Sanpaidong polymetal deposit was formed by complex mineralization.
关键词:复合成矿作用  成矿流体  Sb-Au和Pb-Zn-Sb矿化  五圩矿田
投稿时间:2017-11-20  修订日期:2018-03-27
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主办单位:中国矿物岩石地球化学学会
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