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硅化凝灰岩是贵州晴隆锑矿田普遍发育的成矿作用产物。对比分析未蚀变凝灰岩、硅化凝灰岩、峨眉山玄武岩、萤石和辉锑矿稀土元素配分特征,以及某些高场强元素特征参数,探讨成矿流体物理化学特征。大厂层下段(P2d1)强硅化凝灰岩、中段(P2d2)近矿硅化凝灰岩及上段(P2d3)未蚀变凝灰岩Sb元素丰度显示,与峨眉山玄武岩喷发有关的凝灰岩可能是潜在的晴隆锑矿矿源层,后期热液带来部分矿质来源,热液改造作用是成矿物质富集的关键。凝灰岩蚀变前后稀土元素演化特征研究表明,成矿流体稀土元素含量很低、以富F-为特征且具有还原性。Y/Ho、Zr/Hf和Nb/Ta比值表明晴隆锑矿成矿流体具多源特征。辉锑矿稀土元素配分特征与国内其他辉锑矿有显著区别,其具有近似的W型四分组效应是继承海水或地层水稀土元素特征的表现。
Silicified tuff is a well-developed metallogenic product of Qinglong antimony orefield in Guizhou. The characteristics of rare earth elements (REEs) in unmodified tuffs, silicified tuffs, Emeishan basalts, fluorite and stibnite, as well as the characteristic parameters of some high-field-strength elements, are discussed to discuss the physico-chemical characteristics of ore-forming fluids. The abundance of Sb in the P2d1 strongly silicified tuff, P2d2 near-ores silicified tuff and the upper (P2d3) unettented tuff show that tuff associated with Emeishan basalt eruption may be a potential source of Qinglong antimony ore Layer, the latter part of the hydrothermal mineral resources brought to hydrothermal transformation is the key to the enrichment of mineralization. The study on the evolution characteristics of REE before and after tuff alteration shows that the REE content of the ore-forming fluid is very low, characterized by rich F- and reducible. The ratios of Y / Ho, Zr / Hf and Nb / Ta indicate that the ore-forming fluid of Qinglong antimony ore has multi-source characteristics. The distribution characteristics of rare earth elements in stibnite are significantly different from those of other stibnites in the country. The similar W-type quadrant effect is the characteristic of inheriting the characteristics of rare earth elements in seawater or formation water.