贵州毕节地区煤层中稀土元素在含煤地层划分与对比中应用探讨

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贵州毕节地区煤层中稀土元素在含煤地层划分与对比中应用探讨

王强　 杨瑞东　 鲍淼　

摘　要：稀土元素是良好的地质指示剂,以晚二叠世黔西毕节地区可采煤层中的REE(稀土元素)为研究对象,探讨REE在煤系地层对比、划分中的应用问题.结果显示REE(轻稀土元素)的含量在龙潭组与长兴组的界线附近存在着异常富集的现象,∑REE的含量在界线附近也存在着异常富集的现象.REE在界限附近的异常富集是其物源(间歇性和多旋回性喷发的峨眉山玄武岩)和成煤期频繁的海进海退共同作用的结果.因此,在具有相同物源的地区,可以利用稀土含量的变化,进行煤层和地层的对比、划分,并有可能研究海平面的变化.
关键词：稀土元素;地层;物源;海进海退;毕节
基金项目：贵州省科技厅基金(200503),博士点建设基金资助.
作者简介：王强 男 1977年出生 在读博士 地球化学 E-mail:wqwqqiang@126.com
作者单位：王强（中国科学院广州地球化学研究所同位素年代学与地球化学重点实验室,广州,510640;中国科学院研究生院,北京,100049）　
　　　　　杨瑞东（贵州大学资源与环境工程学院,贵阳,550003）　
　　　　　鲍淼（贵州大学资源与环境工程学院,贵阳,550003）　
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