应用ICP-MS研究黔西南地区构造蚀变体稀土元素地球化学特征

发布时间：2018-08-20 16:52

【摘要】：构造蚀变体(SBT)是沉积作用、构造作用和热液蚀变的综合产物。SBT作为黔西南地区金、锑、萤石等矿产的重要就位空间,金锑矿成矿与其密切相关。近年在黔西南地区发现了丰富的金资源量,关键在于SBT体系的提出及与之为核心的成矿模式的建立和应用。本文应用电感耦合等离子体质谱法(ICP-MS)分析了黔西南台地相区典型矿床的SBT样品,揭示稀土元素的地球化学特征。结果表明,不同矿区SBT的ΣREE=49.55×10~(-6)~271.72×10~(-6),含量变化较大,LREE/HREE=5.62~13.59,轻重稀土分馏明显,轻稀土富集;SBT对北美页岩和CI球粒陨石标准化配分模式图均表现为轻稀土富集的右倾型、"四分组"效应明显、强烈热液作用,为同一体系的产物;大厂至戈塘一线显示高的正铕异常,推测有两个方向含矿热液在此汇聚。本文系统对比了黔西南地区SBT稀土元素地球化学特征,反映该区成矿流体来源及演化,为本区微细浸染型金矿的成矿预测提供了依据。
[Abstract]:Structural alteration (SBT) is a synthetic product of sedimentary process and hydrothermal alteration. It is an important location space for gold antimony fluorite and other minerals in southwest Guizhou. The mineralization of gold-antimony ore is closely related to it. In recent years, abundant gold resources have been found in Southwest Guizhou. The key lies in the establishment and application of the SBT system and the metallogenic model which is the core of the system. In this paper, SBT samples of typical deposits in platform facies area of southwest Guizhou are analyzed by inductively coupled plasma-mass spectrometry (ICP-MS), and the geochemical characteristics of rare earth elements are revealed. The results showed that 危 REE=49.55 脳 10 ~ (-6) F 271.72 脳 10 ~ (-6) in different mining areas had a great change in content of LREE / HREEN 5.62 ~ (-2) ~ (13. 59), and the fractionation of light rare earth elements was obvious. The patterns of normalized partition pattern of SBT for North American shale and CI chondrites showed a right inclination pattern of enrichment of light rare earths, and the "four groups" effect was obvious. The strong hydrothermal action is the product of the same system, and the first line from Dachang to Gotang shows a high positive europium anomaly, which suggests that there are two directions of ore-bearing hydrothermal converging here. In this paper, the geochemical characteristics of SBT rare earth elements in southwestern Guizhou are systematically compared, reflecting the origin and evolution of ore-forming fluids in this area, which provides a basis for metallogenic prediction of micro-disseminated gold deposits in this area.
【作者单位】：贵州省地质矿产中心实验室;国土资源部贵阳矿产资源监督检测中心;中国地质大学(武汉)材料与化学学院;山西省岩矿测试应用研究所;贵州省地质矿产勘查开发局一O五地质大队;中国科学院地球化学研究所矿床地球化学国家重点实验室;
【基金】：国家自然科学基金资助项目(51364005) 中国地质调查局贵州贞丰—普安金矿整装勘查区关键基础地质研究项目(12120114016301) 黔地矿科技合作项目(2014-05)
【分类号】：P618.2;P595

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