皖北奥陶系稀土元素地化特征及其古岩溶环境标志

REE GEOCHEMICAL CHARACTERISTICS AND ITS PALEOKARSTENVIRONMENTAL MARKS OF ORDOVICIAN IN NORTHERN ANHUI

摘要: 用等离子光谱仪(ICP)方法,对安徽北部肖县下奥陶统顶部14个岩溶岩样品的稀土元素(15个项目)含量进行了测定分析。在阐明REE总量和配分模式及LREE和HREE、δEu和δCe特征及相互关系的基础上,讨论了稀土地球化学特征与古岩溶发育环境的关系,并初步探讨了岩溶岩溶蚀程度和岩溶岩形成环境的定量识别标准。

Abstract: The REE contents of 14 samples selected from Ordovician carbonate sections in Xiao County,North Anhui have been investigated using ICP.Based on describing ∑REE,the distributed model of REE,characteristics and relations between LREE and HREE Eu and Ce,it is discussed in detail that the relation between REE geochemical characteristics and paleokarst development.The quantitative identification standards of karstic erosion degree and karstification environment are also preliminarily discussed.