| 熊耳山上宫金矿稀土元素特征及对金矿物质来源的指示意义 |
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| 引用本文：张苏坤,刘耀文,汪江河,冯绍平,常嘉毅,张争辉,毛宁.2020.熊耳山上宫金矿稀土元素特征及对金矿物质来源的指示意义[J].地球学报,41(6):938-948. |
| DOI：10.3975/cagsb.2020.082501 |
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| 基金项目:国家重点研发计划项目“穿透性地球化学勘查技术”(编号: 2016YFC0600600) |
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| 中文摘要:上宫金矿矿化样品与熊耳群安山岩、燕山期花岗岩有着相似的稀土元素特征, 其物源关系更为密切。不同类型矿石的稀土总质量分数存在较大差别, 总体呈现出矿化程度越强稀土总量越低的特征。大部分金矿石与铅锌(银金)矿石均表现出弱的Eu、Ce异常, 其中δEu金矿石(均值0.84)＞δEu铅锌矿石(均值0.75), δCe金矿石(均值0.88)＞δCe铅锌矿石(均值0.96), 造成这种现象的原因可能是热液交代或成矿热液为富Cl–的还原性流体。 (Sm/Eu)样品/(Sm/Eu)球粒陨石-(Sm/Eu)样品图解显示, 上宫金矿各类样品能近似拟合成一条直线, 说明了岩浆热液为成矿提供了最初的热源和物源, 而安山岩和片麻岩的接触交代可能对成矿提供了部分物源。矿石样品和蚀变岩样品中均出现不同程度的Tb、Tm元素正异常, 说明成矿物质来源可能受到了地壳岩石的影响。上宫金矿田δEu-Au相关图解显示, 成矿过程中, 随着Au元素的富集, Eu元素也出现相对富集。 |
| 中文关键词:稀土元素 地球化学 成矿物质来源 上宫金矿 熊耳山 |
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| The Implications of REE Characteristics for Gold Sources of the Shanggong Gold Deposit in Xionger Mountain |
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| Abstract:The mineralized samples of the Shanggong gold deposit have more similar REE characteristics to those of Xionger Group andesite and Yanshanian granite, and their provenances are more closely related to each other. The ΣREE value in different ore types is quite different, and the ΣREE value decreases with the increase of mineralization. Most of the samples of gold ore and lead-zinc (silver-gold) ore show weak Eu and Ce anomalies, in which δEugold ore(0.84)＞δEuLead zinc ore (0.75), δCegold ore (0.88)＞δCeLead zinc (0.96); the reason for this phenomenon may be that the hydrothermal metasomatism or the ore-forming hydrothermal fluid was Cl– rich reducing fluid. According to the diagram of (Sm/Eu)chondrite (Sm/Eu)samples-(Sm/Eu)samples, all kinds of samples from the Shanggong gold deposit can approximately be integrated into a related straight line. It is indicated that magmatic hydrothermal fluid provided the initial heat source and material source for mineralization, while contact metasomatism of andesite and gneiss probably provided partial material source for mineralization. There are positive anomalies of Tb and Tm elements in both ore samples and altered rock samples, indicating that the source of ore-forming materials might have been affected by crustal rocks. The diagram of δEu-Au correlation in the Shanggong gold orefield shows that, with the enrichment of Au elements, Eu elements are relatively enriched. |
| keywords:rare earth element geochemistry metallogenic material source Shanggong gold deposit Xionger Mountain |
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