岩溶地下河系统中表层土壤稀土元素含量及分布特征  

Content and Distribution Characteristics of Rare Earth Elements in Surface Soil from Karst Underground River System

作　　者：樊连杰[1] 裴建国[1] 赵良杰[1] 林永生[1] 卢丽[1] 王喆[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,国土资源部/广西壮族自治区岩溶动力学重点实验室,广西桂林541004

出　　处：《中国稀土学报》2016年第4期504-512,共9页Journal of the Chinese Society of Rare Earths

基　　金：中国地质科学院岩溶地质研究所基本科研业务费项目(2014023);中国地质调查局地质调查项目(1212011121164)资助

摘　　要：以桂林寨底地下河系统中表层土壤为研究对象,采用激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)进行稀土元素测试分析,开展了稀土元素地球化学研究,研究结果表明:研究区内土壤稀土元素总量∑REE分布范围为117.82~451.98μg·g^(-1),平均为312.30μg·g^(-1),变化范围属中等分异型,高于中国大陆的土壤稀土元素总量背景值。轻稀土总量LREE高于中国大陆土壤LREE背景值,重稀土总量HREE略低于中国大陆土壤HREE背景值。LREE/HREE平均值为7.86,与北美页岩LREE/HREE值7.47相接近。土壤样品的北美页岩标准化曲线具有略轻稀土富集的右倾特征,Ce和Eu均表现出微弱的负异常特征,与研究区内成土母岩有一定的关系。虽然成土母岩决定着土壤中稀土元素的初始含量,但最终含量还受到其他因素的影响。The REEs of soil samples in Zhaidi underground river in Guilin,were analyzed by laser ablation inductively coupled plasma mass spectrometry（ LA-ICP-MS） and the process is presented. The results indicated that the total rare earth elements（ REEs） contents of soil range from 117. 82 to 451. 98 μg·g^- 1,averaging 312. 30 μg·g^- 1,The spatial distribution of REE has medium differentiation. REEs and LREE levels in all soil samples are bigger than the mean level of China mainland. HREE levels are slightly lower than the mean level of China Mainland. Themean value of LREE / HREE was 7. 86,which was close to 7. 47 of the North American Shale. The REEs patterns of shale normalized by Northern American Shale Composite（ NASC） display that light rare earth element were enriched relative to heavy rare earth element,with negative Ce anomalies and negative Eu anomalies. The negative Ce,Eu anomalies and parent rocks had a certain correlation. Although the mother rock decided the initial content of rare earth elements in soil,but the content was also affected by other factors.

关 键 词：稀土元素 土壤 岩溶地区 广西桂林 

分 类 号：P595[天文地球—地球化学]