黄铁矿稀土元素和微量元素地球化学特征:对东准噶尔绿源金矿成矿流体的约束

发布时间：2019-07-08 19:31

【摘要】：为探讨东准噶尔绿源金矿成矿流体性质及其演化特征,以矿床中的载金黄铁矿为研究对象,运用ICP-MS方法,研究了黄铁矿中的稀土元素和微量元素地球化学特征。结果显示,黄铁矿具有轻重稀土分馏较明显、轻稀土元素富集的右倾配分模式,其Hf/Sm、Th/La和Nb/La值均小于1;富集Cu、Pb、Zn、Cd、Sb等亲硫元素,具有较弱的Ce负异常。上述特征表明,成矿过程的物理化学条件为还原环境,成矿Ⅰ、Ⅱ阶段流体的温度低,成矿Ⅲ阶段可能混入外来热液,导致流体温度升高。黄铁矿的Y/Ho值、Zr/Hf值和Nb/Ta值较大的变化范围表明成矿热液以早期流体为主,并可能与弧后盆地关系密切。
文内图片：

图片说明：绿源金矿黄铁矿稀土元素球粒陨石标准化模式图
[Abstract]:In order to study the metallogenic fluid properties and evolution characteristics of Luyuan gold deposit in East Junggar, the geochemical characteristics of rare earth elements and trace elements in pyrite were studied by ICP-MS method. The results show that pyrite has obvious light rare earth fractionation, light rare earth element enrichment right dip partition model, its Hf/Sm,Th/La and Nb/ La values are less than 1, enrichment of Cu,Pb,Zn,Cd,Sb and other thiophilic elements, there is a weak negative Ce anomaly. The above characteristics show that the physicochemical conditions of the metallogenic process are reduction environment, the temperature of the fluid in the first and second stages of mineralization is low, and the third stage of mineralization may be mixed into the foreign hydrothermal solution, resulting in an increase in the fluid temperature. The large variation range of Y / Ho value, Zr/ HF value and Nb/ Ta value of pyrite indicates that the ore-forming hydrothermal solution is dominated by early fluid and may be closely related to the back-arc basin.
【作者单位】：中国地质大学(北京)地球科学与资源学院地质过程与矿产资源国家重点实验室;新疆维吾尔自治区地质矿产勘查开发局第六地质大队;
【基金】：新疆地质矿产勘查开发局项目(DZKC201504-009)
【分类号】：P595;P618.51

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