厦门西海域表层沉积物中稀土元素分布特征  

REE Distribution Characteristics in Surface Sediments from Western Xiamen Bay

作　　者：姚藩照[1] 胡忻[2,3] 柳欣[3] 张宇峰[1] 

机构地区：[1]南京工业大学环境学院,江苏南京210009 [2]南京大学现代分析中心,生命分析教育部重点实验室,江苏南京210093 [3]厦门大学海洋与环境学院,近海海洋环境科学国家重点实验室,福建厦门361005

出　　处：《中国稀土学报》2010年第4期495-500,共6页Journal of the Chinese Society of Rare Earths

基　　金：近海海洋环境科学国家重点实验室(厦门大学)开放基金项目(MEL0705);国家自然科学基金项目(20607010)资助

摘　　要：以厦门西海域表层沉积物为对象,研究了沉积物中稀土元素（REE）的分布特征。结果表明：厦门西海域沉积物中REE含量为125.71~206.02μg.g-1,西部港湾区的8号和九龙江口的2号采样点REE含量较高,且轻稀土占绝对优势。REE含量随沉积物粒级呈有规律的变化,REE含量最高的是〈63μm的粒级,最低的是〉250μm的粒级;沉积物经球粒陨石标准化后,各粒级REE总体配分曲线相近,均表现为明显的Eu亏损和Ce亏损,且〈63μm粒级亏损尤为严重。Eu与Ce异常平均值均小于黄河流域和长江流域沉积物;〈63μm粒级的沉积物中轻重稀土分馏程度最高,但在其他三种粒级沉积物中由粗到细分馏程度逐渐降低。分馏现象表明细粒级沉积物轻重分馏较粗粒级明显。与当地土壤稀土元素背景值比较,沉积物主要来自厦门西海域本地的土壤。REE distribution characteristics of surface sediment samples collected from the Western Xiamen Bay were investigated.The results indicated that the contents of REE in sediments from Western Xiamen Bay were 125.71~206.02 μg·g-1.Their contents in No.8（western harbor） and No.2（Jiulong River） were higher than other sampling sites,and the LREE were the main components in the total REE.The REE distributions in different grain size samples showed that the maximum content of REE was in 63 μm fractions,the lowest was found in the 250 μm fraction.The chondrite-normalized patterns of REE showed that the different sediment fractions had similar distribution pattern,and exhibited a clear loss of Eu and Ce,which were particularly serious in the 63 μm fractions.The average values of Eu and Ce anomalies were less than them in the Yellow River and Yangtze River sediment.The fractionation of LREE and HREE in the fine-grained size fractions（63 μm fractions） was greater than the coarse-grained size（63 μm fractions）,and their fractionation in the coarse-grained decreased gradually with a reduce of size.The L/H fractionation showed that their fractionation in the fine-grained size fractions was significantly higher than the coarse-grained size.The sediments in the study area were mostly derived from the soil of Xiamen Bay.

关 键 词：厦门西海域 沉积物 稀土元素(REE) 分布 

分 类 号：X142[环境科学与工程—环境科学] P736.21[天文地球—海洋地质]