【摘要】 本文对贵州岩溶沉积物稀土元素地球化学研究结果表明：稀土总量变化范围很大，RE2O3（1～434.39）×10－6。RE2O3随Al2O3含量增高而增高，随CaCO3含量增高而减少，相关系数分别为＋0．99，－0．98。低微含量的岩溶沉积物与碳酸盐母岩的稀土分布模式基本相似，高含量的岩溶沉积物稀土分布趋向于页岩模式。稀土解析实验和吸附实验表明，在岩溶化学沉积物和母岩中稀土主要以离子吸附态存在，岩溶碎屑沉积物中稀土主要以类质同象进入粘土矿物和副矿物格架中。稀土富集系数Kk值计算表明，在碳酸盐岩及其岩溶化学沉积物的成岩过程中不存在稀土富集，岩溶碎屑粘土沉积物中则存在稀土富集。对岩溶化学沉积物──碳酸盐结核的中心区、过渡带、边缘带及外围壳状粘土中稀土元素解析研究表明，随着结核的生长，活动性稀土组成发生变化，向轻、中稀土占优势的方向移动。更多还原

【Abstract】 The results of the REE geochemical study of karst sediments in Guizhou Province have shown that the total amount of REE varies over a wide range with RE2O3 between (1~434.39) ×10-6.The content of RE2O3 tends to increase with increasing Al2O3 content and decrease with increasing CaCO3 content, with the correlation coefficients being +0. 99 and -0.98, respectively. REE-low karst sediments are generally similar to their parent carbonate rocks with respect to their REE distribution patterns while REE-high karst sediments have a REE distribution pattern similar to that of shales. Experiments have shown that the REEs in karst chemical sediments and parent rocks are present mainly in the form of adsorbed ions. In the karst clastic sediments they are isomorphously present in the lattice of clay minerals and accessory minerals. The calculation of the REE enrichment coefficient K. indicates that during the diagenesis of carbonate rocks and their karst chemical sediments there occurred no REE enrichment against a REE enrichment in karst clastic argillaceous sediments. Studies demonstrate that with the growth of nodu1es composed of karst chemical sediments and carbonate variations are noticed in the composition of mobile REEs, shifting toward the predominance of light and heavy REEs.更多还原