热液金矿床石英及其流体包裹体中稀土元素配分特征及地质意义
首发时间:2007-11-14
摘要:摘要:稀土元素可以有效地示踪热液矿床的成矿流体来源。本文根据近年来积累的文献资料研究发现:①热液金矿床石英中稀土元素主要赋存于富Zr、Ti的微细矿物包裹体中,如榍石、褐帘石、锆石、金红石、尖晶石、钛铁矿等,石英流体包裹体中稀土元素的含量很少,其比例范围介于0.009%~1.340%之间,均值为0.110%。②石英流体包裹体中的稀土元素含量与石英的稀土元素含量间具有较好的线性关系和相似的球粒陨石标准化配分模式,可以利用石英流体包裹体的稀土元素或石英的稀土元素配分特点及相关参数特征示踪成矿物质和成矿液体的来源和性质。同时,笔者也强调:应用石英及其流体包裹体稀土元素示踪研究应加强对成矿物理化学条件的研究,重视稀土元素示踪与同位素示踪相结合,更有助于准确地判断成矿流体的来源。
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Distribution characteristics and significance of Rare Earth Elements in quartz and fluid inclusions of quartz from hydrothermal gold deposits
Abstract:Rare earth elements (REE) can effectively investigate the source of ore-forming fluids. On the basis of high precisely data published recently, some important conclusions are presented: ① REEs in quartz from hydrothermal gold deposits are mainly located in the Zr,Ti-rich tiny minerals wrapped in quartz, such as titanite, allanite, zircon , rutile , spinelle , ilmenite, etc. However, the ratios of rare earth elements in fluid inclusions of quartz range from 0.009% to 1. 340%, with mean of 0.110%. ② REEs in fluid inclusions of quartz have good linear relations and the same chondrite-normalized REE patterns with those in quartz, so we can use REE in quartz or in fluid inclusions of quartz to trace the sources of ore-forming materials and the sources and characteristics of ore-forming fluids in hydrothermal gold deposits. Meanwhile, the authors also emphasize that tracing with rare earth elements in quartz or in fluid inclusions of quartz one should strengthen the study of physical and chemical conditions of gold mineralization, pay attention to the combination between tracing with rare earth elements and isotopic study.
Keywords: quartz, fluid inclusion,REE, distribution characteristics, hydrothermal gold deposits
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No.1634816688411950****
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