冀北地区萤石矿地质特征及成因初探

Preliminary Study on the Geological Characteristics and Genesis of Fluorite Deposits in Northern Hebei Province

冀北地区拥有丰富的萤石矿资源,通过分析本区萤石矿的矿床地质特征、地球化学特征,对萤石矿成矿物质来源、成因进行了探讨。结果表明:区内萤石矿中Co、Ni、Sr含量较高,赋存于花岗岩中的萤石矿总体表现为轻稀土富集,赋存于火山岩中的萤石矿表现为轻稀土亏损;Eu显示有正异常及负异常,表明萤石成矿环境即有氧化环境又有还原环境;Ce均为弱的负异常,一定程度上反映了冀北地区萤石成矿流体演化的一致性;萤石在Y/Ho-La/Ho图中基本呈水平分布,表明冀北地区萤石成矿物质是同源的;区内萤石矿床具有中低温热液型地质特征,样品均落在Tb/Ca-Tb/La关系图中的热液区;综合分析认为成因类型为中低温热液充填型。

There are abundant fluorite ore resources in northern Hebei.Through the analysis of the geological characteristics and geochemistry of fluorite ore,the mineral source and origin of fluorite ore are discussed.The results show that the content of Co,Ni,and Sr in the fluorite mines in the area is relatively high.The fluorite mines that occur in granite are generally enriched in light rare earth elements,and the fluorite mines that occur in volcanic rocks are deficient in light rare earth elements;Eu shows both positive and negative anomalies,indicating that the fluorite mineralization environment has both an oxidizing environment and a reducing environment;Ce always shows weak negative anomalies,reflecting the consistency of the evolution of fluorite ore-forming fluids in northern Hebei to some certain extent.Fluorite is basically horizontally distributed in the Y/Ho-La/Ho graph,indicating that the fluorite mineralization in northern Hebei is homologous.The fluorite deposits in the area have the geological characteristics of the medium and low temperature hydrothermal type.The samples all fall in the hydrothermal area in the Tb/Ca-Tb/La relationship diagram.Ii is thought by comprehensive analysis that the genetic type is the medium and low temperature hydrothermal filling type.