| 北京平原沉积物稀土元素地球化学特征及物源意义 |
| |
| 引用本文： | 魏亮,郭华明,谢振华,李志萍.北京平原沉积物稀土元素地球化学特征及物源意义[J].地学前缘,2010,17(6):72-80. |
| |
| 作者姓名： | 魏亮 郭华明 谢振华 李志萍 |
| |
| 作者单位： | 1中国地质大学(北京) 水资源与环境学院, 北京 100083;
2北京市水文地质工程地质大队, 北京 100195 |
| |
| 基金项目： | 北京市科技计划项目“北京市地下水资源安全评价及污染防控技术研究与示范”(D07050601510000); 国家重点基础研究发展计划“973”项目“人类活动条件下地下水数量和质量演变机理与趋势”(2010CB428804) |
| |
| 摘 要： | 文中总结了北京平原永定河、潮白河流域钻孔沉积物中稀土元素分布特征,两流域沉积物稀土元素总量∑REE、轻重稀土比(LREE/HREE)及轻(La/Sm)N、重(Gd/Yb)N稀土分馏特征差异较为显著。粒度对沉积物稀土分布(总量、轻重稀土比及分馏特征)有一定影响;各流域沉积物均表现为轻稀土相对富集、弱Eu负异常的球粒陨石标准化曲线。细颗粒沉积物稀土分馏特征(La/Yb)N有较好的物源示踪意义。根据沉积物(La/Yb)N值对永定河、潮白河交互沉积区不同深度沉积物进行了物源示踪,不同深度上沉积物来源不同。此外,同一流域上、中、下游沉积物稀土分馏特征不同。常量元素Al2O3/Fe2O3与稀土元素(La/Yb)N划分结果相符,但精度低于稀土元素物源分析。
|
| 关 键 词： | 北京平原 沉积物 物源 稀土元素(REE) 常量元素 |
Rare earth elements geochemistry and its implication for sediment provenance in the Beijing Plain |
| |
| Wei Liang,Guo Huaming,Xie Zhenhua,Li Zhiping.Rare earth elements geochemistry and its implication for sediment provenance in the Beijing Plain[J].Earth Science Frontiers,2010,17(6):72-80. |
| |
| Authors: | Wei Liang Guo Huaming Xie Zhenhua Li Zhiping |
| |
| Institution: | 1School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China;
2Hydrogeology and Engineering Geology Team of Beijing, Beijing 100195, China |
| |
| Abstract: | Based on borehole logging,sediment sampling and analysis,we systematically evaluated the REE distribution characteristics of the sediment from different boreholes in Yongding River catchment and Chaobai River catchment of Beijing Plain.Results show that ∑REE,LREE/HREE,(La/Sm)N,and(Gd/Yb)N of sediments have significant differences between Yongding River catchment and Chaobai River catchment.REE characteristics were generally controlled by grain size of sediments.The chondrite-normalized REE patterns show LREE enrichment and weak Eu negative anomaly.The(La/Yb)N of fine fraction is a good indicator for provenance identification.According to(La/Yb)N,sediments obtained from different depths of several boreholes in the interactive sedimentation region have different sources.In addition,sediments from upper,middle and lower reaches of Yongding River catchment and Chaobai River catchment were identified by means of REE fractionation characteristics.The result is consistent with the provenance identification using the ratio of Al2O3 to Fe2O3.However,REE fractionation can be used for the provenance analysis more precisely in comparison with major composition ratios. |
| |
| Keywords: | Beijing Plain sediment provenance REE major composition |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地学前缘》浏览原始摘要信息 |
| 点击此处可从《地学前缘》下载免费的PDF全文 |
|
