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分别采用电感耦合等离子发射光谱(ICP-AES)和中子活化法(INAA)对采自河北兴隆、天津蓟玉、山西大同和阳泉、内蒙老窝铺以及宁夏石嘴山和石炭井二叠系山西组的11个粘土岩样品进行了稀土元素含量测定。结果表明:研究样品的稀土元素含量变化很大,∑REE最低49.43mg/kg,最高478.66mg/kg,平均165.04mg/kg,稍低于北美页岩(NASC)的173.21mg/kg;∑LREE/∑HREE介于3.44～21.23之间,平均9.74,与NASC的7.68相近;多为中—重度Eu亏损以及弱—中度Ce负异常。研究样品不具有典型的沉积型泥岩特征,结合薄片鉴定及前人分析结果推论,粘土岩可能分别由中、基性及酸性(偏碱)火山碎屑物质原地蚀变形成,并不同程度地混有陆源沉积物。
The samples collected from Hebei Xinglong, Tianjin Jiyu, Shanxi Datong and Yangquan, Inner Mongolia Mengnongpu and Ningxia Shizuishan and Carboniferous Permian Shanxi were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES) and neutron activation (INAA) Eleven claystone samples were determined for their contents of rare earth elements. The results showed that the contents of rare earth elements in the samples varied greatly. The minimum ΣREE was 49.43mg / kg and the highest was 478.66mg / kg, averaging 165.04mg / kg, slightly lower than 173.21mg / kg for North American shale (NASC) / ΣHREE ranged from 3.44 to 21.23, with an average of 9.74, which was similar to that of NASC 7.68. Most of them were moderate-heavy Eu depletion and weak-moderate Ce negative anomalies. The study samples do not have the typical characteristics of sedimentary mudstone. Based on the identification of thin sections and the results of previous analysis, clay rocks may be formed by in situ alteration of medium-, basic- and acid-base pyrochlore materials, respectively, to varying extents Mixed with terrigenous sediments.