湟水河西宁段表层沉积物稀土元素地球化学特征及其物源分析  

Geochemical Characteristics and Provenance Analysis of REE in Surface Sediments From Xining Section of Huangshui River

作　　者：徐双贵 杨莎 胡婷婷 杨天琦 拜明清 Xu Shuanggui;Yang Sha;Hu Tingting;Yang Tianqi;Bai Mingqing(Department of Geological En-gineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学地质工程系,青海西宁810016

出　　处：《中国稀土学报》2022年第4期711-720,共10页Journal of the Chinese Society of Rare Earths

基　　金：青海省科技计划项目(2018-ZJ-956Q);国家自然科学基金青年项目(41703012)资助。

摘　　要：采样测定了湟水河西宁段表层沉积物28个样品的14种稀土元素地球化学含量,分析其含量、特征参数及配分模式,探讨其影响因素及物质来源。结果表明:湟水河西宁段表层沉积物中稀土元素总含量为89.75~217.58 mg∙kg^(-1),平均值为153.56 mg∙kg^(-1);28个样品的稀土元素含量变化较为一致,组成特征变化较小,轻稀土元素相对富集,重稀土元素相对亏损,Eu呈中等程度亏损,Ce呈无异常;沉积岩源岩及矿物组成对湟水河西宁段表层沉积物中稀土元素的组成起到控制作用,化学风化对稀土元素的组成无影响;湟水河西宁段表层沉积物的稀土元素特征参数、大陆上地壳和球粒陨石标准化配分模式与青海土壤、黄河沉积物接近,暗示了湟水河西宁段表层沉积物中稀土元素主要来源于湟水河河流侵蚀搬运物,同时其为黄河沉积物中稀土元素提供部分物源。The geochemical contents of rare earth element(REE)in 28 samples collected from surface sedi⁃ments in Xining section of Huangshui River were determined.The contents,characteristic parameters and distri⁃bution patterns of REE were analyzed,and influencing factors and source of REE were discussed.The results showed that total REE contents in surface sediments from Xining section of Huangshui River ranged from 89.75 to 217.58 mg·kg^(-1),with an average of 153.56 mg·kg^(-1).The variation trend of REE contents from 28 samples were consistent,and the changes of composition characteristics were small.LREE was relatively enriched,and HREE was relatively depleted with moderate negative Eu anomalies and without Ce anomalies.The source rock and mineral compositions of sedimentary rocks controlled the compositions of REE in surface sediments from Xining section of Huangshui River,while chemical weathering had no effect on the compositions of REE.The characteristic parameters,upper continental crust-normalized and chondrite-normalized REE patterns were close to soils in Qinghai and sediments in Yellow River,indicating that REE of surface sediments in Xining section of Huangshui River mainly came from weathered materials of Huangshui River and provided a partial source of REE in sediments of the Yellow River.

关 键 词：表层沉积物 稀土元素 地球化学 影响因素 物质来源 湟水河西宁段 

分 类 号：P736.21[天文地球—海洋地质]