何阳阳,温春齐,刘显凡.西藏多不杂铜矿床脉石矿物稀土元素地球化学示踪[J].有色金属工程,2018,8(3):.
西藏多不杂铜矿床脉石矿物稀土元素地球化学示踪
Gangue mineral REE geochemical tracer of the Duobuza Copper Deposit,Tibet
投稿时间:2016-11-05  修订日期:2017-04-05
DOI:
中文关键词:  脉石矿物  稀土元素  多不杂铜矿床  西藏
英文关键词:Gangue minerals  Rare Earth Elements  The Duobuza copper deposit  Tibet
基金项目:国土资源部公益性行业科研专项项目(201011013)
        
作者单位
何阳阳 内江师范学院 地理与资源科学学院
温春齐 成都理工大学 地球科学学院
刘显凡 成都理工大学 地球科学学院
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中文摘要:
      探讨多不杂铜矿床成矿流体的演化规律,分析花岗闪长斑岩壳幔混染的过程。选择多不杂铜矿床内相关脉石矿物,测试其稀土元素组成。研究表明,各个成矿阶段脉石矿物的稀土元素均具有轻稀土富集的特征,这是地幔流体作用成矿的标志;斑晶石英和黑云母样品具有明显的正Eu异常,脉石英样品具有弱的负铕异常,硬石膏的稀土总量最高,并呈现出明显的负Eu异常;随着成矿过程的进行,稀土元素表现为由正铕异常→无铕异常→负铕异常演变,这正是地幔流体作用导致流体性质变化进而混染成矿的证据。
英文摘要:
      Discussion on metallogenic fluid evolution of the Duobuza copper deposit, Analysis of crust mantle mixing process in granodiorite porphyry. Select the relevant gangue minerals in the Duobuza copper deposit, and test the composition of rare earth elements. Research shows that the rare earth elements of each metallogenic stage of gangue minerals are light REE enrichment, this is a sign of mantle fluid mineralization. The samples of phenocrysts quartz and biotite have obvious positive Eu anomalies, and the quartz samples have weak negative Eu anomaly. The total amount of rare earth in anhydrite is the highest and shows obvious negative Eu anomaly. In the mineralization process, rare earth elements on the characteristics of positive Eu anomaly to negative Eu anomaly evolution, it records the mantle magma and fluid in diagenesis and mineralization process, accompanied by magmatic crystallization diagenetic metasomatic rock and its evolution process of fluid properties, causing mantle matter contamination and superposition mineralization.
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