Distribution Characteristics of Rare Earth Elements in Surface Sediment and Their Provenance Discrimination in the Eastern Bohai and Northern Yellow Seas
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摘要: 为了探讨渤海东部和黄海北部稀土元素分布特征及其影响因素,对渤海东部和黄海北部138个表层沉积物样品进行电感耦合等离子体质谱法分析.结果表明:渤海东部和黄海北部沉积物的配分模式与中国黄土的接近,与周边的鸭绿江、黄河等河流输入物质也有相似性,表明研究区沉积物主要来自于周边大陆.沉积物物源判别结果显示:山东半岛近岸及其西南部沉积物主要来源于黄河,该区域沉积物分布受山东半岛沿岸流及近岸潮流影响;研究区东部沉积物稀土元素组成特征与鸭绿江沉积物组成相近,表明研究区东部沉积物可能由鸭绿江供应;研究区西北部沉积物主要来源于黄河及辽宁沿岸物质输入,局部有滦河、六股河物质存在;研究区东南部物质主要来源于黄河.对沉积物稀土元素百分含量及参数特征值进行了Q型聚类分析,将研究海域沉积物划分为4个不同的区域,分别为北黄海东部区域(Ⅰ)、山东半岛近岸周边区域(Ⅱ)、渤海东部中部区域(Ⅲ)及研究区的西北部与东南部分布区(Ⅳ).Abstract: Rare earth elements (REE) were analyzed by ICP-MS analysis in 138 surface sediments samples collected from in the eastern Bohai and northern Yellow Seas, China. The results indicated that the REE UCC normalization distribution pattern in surface sediments in the eastern Bohai and northern Yellow Seas was similar to that in Chinese loess, and also those of coastal rivers including the Yalu River, the Yellow River and other rivers, indicating that the sediments in study area were mainly derived from the mainland substance. Provenance discrimination results showed that the sediments in the Shandong Peninsula and southwestern shore were mainly derived from the Yellow River, the area affected by the coastal current of the Shandong Peninsula and near shore tidal current; REE composition characteristics of sediment in the eastern part in the study area were similar to the Yalu River sediments, indicating that the sediments of the eastern study area may be supplied by the Yalu River. Sediments of the western part of the study area were mainly derived from the Yellow River and Liaoning coast material input, the local presence of the Luanhe River, Liuguhe River substance. The material of southeast in the study area mainly derived from the Yellow River. The REE contents and parameters of characteristic value were analyzed by the Q cluster analysis, the study area can be divided into four different regions, Namely region in the eastern part of the North Yellow Sea (Ⅰ), the Shandong Peninsula inshore surrounding area (Ⅱ), middle area in the eastern Bohai Sea (Ⅲ) and distributions in the northwest and southeast of the study area (Ⅳ).
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Key words:
- rare earth elements /
- distribution /
- surface sediments /
- eastern Bohai Sea /
- northern Yellow Sea /
- geochemistry
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图 5 黄河、长江、锦江、汉江和表层沉积物上地壳标准化稀土元素配分模式
长江、黄河数据引自Yang et al.(2002);鸭绿江、汉江、汉江数据引自Yang et al.(2003)
Fig. 5. UCC-normalzed REE distribution patterns of samples in Yellow River, Yangtze River, Keum River, Han River and surface sediments
表 1 渤海东部和黄海北部表层沉积物稀土元素含量(μg/g)
Table 1. Concentrations of REE in surface sediments from the eastern Bohai and northern Yellow Seas (μg/g)
元素 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE 最大值 48.9 102.0 11.50 41.9 7.14 1.37 6.07 0.92 5.19 1.05 2.97 0.47 2.99 0.47 27.5 247.6 最小值 19.5 38.4 4.65 17.2 3.13 0.70 2.61 0.41 2.33 0.45 1.16 0.16 1.01 0.15 11.6 115.0 平均值 33.5 66.6 7.86 29.2 5.25 1.08 4.56 0.70 3.92 0.80 2.21 0.34 2.20 0.35 21.1 179.7 表 2 渤海东部和黄海北部表层沉积物各组份的相关关系
Table 2. Correlation coefficients between the elements of surface sediment in the eastern Bohai and northern Yellow Seas
∑REE ∑LREE/∑HREE 砂 粉砂 黏土 Al2O3 CaO TiO2 MgO TFe2O3 Zr Th Cr Co Rb Sr ∑REE 1.00 ∑LREE/∑HREE 0.73** 1.00 砂 -0.56** -0.34** 1.00 粉砂 0.53** 0.29** -0.98** 1.00 黏土 0.53** 0.41** -0.87** 0.76** 1.00 Al2O3 0.64** 0.56** -0.76** 0.70** 0.79** 1.00 CaO -0.21* -0.21* -0.10 0.11 0.06 -0.32** 1.00 TiO2 0.60** 0.33** -0.92** 0.93** 0.73** 0.77** -0.06 1.00 MgO 0.57** 0.43** -0.88** 0.84** 0.84** 0.89** 0.06 0.84** 1.00 TFe2O3 0.65** 0.48** -0.83** 0.76** 0.85** 0.84** 0.05 0.77** 0.95** 1.00 Zr -0.09 -0.13 0.30** -0.24** -0.37** -0.43** -0.21* -0.14 -0.51** -0.52** 1.00 Th 0.91** 0.73** -0.66** 0.62** 0.64** 0.81** -0.26** 0.71** 0.74** 0.76 ** -0.18* 1.00 Cr 0.61** 0.44** -0.91** 0.87** 0.84** 0.89** -0.05 0.90** 0.95** 0.92** -0.38** 0.79** 1.00 Co 0.66** 0.50** -0.84** 0.77** 0.86** 0.89** -0.04 0.79** 0.94** 0.97** -0.50** 0.78** 0.93** 1.00 Rb 0.66** 0.59** -0.60** 0.52** 0.71** 0.92** -0.35** 0.59** 0.79** 0.82** -0.52** 0.80** 0.78** 0.87** 1.00 Sr -0.32** -0.29** 0.34** -0.34** -0.28** -0.57** 0.65** -0.42** -0.41** -0.36** 0.08 -0.47** -0.45** -0.41** -0.54** 1.00 注:使用PASS统计软件分析;**代表双侧检验在0.01水平上显著相关;*代表在0.05水平上显著相关 表 3 Q-型分区稀土元素的特征参数(μg/g)
Table 3. The characteristic parameters of REE (μg/g)
分区 样品数 ∑REE δEuN ∑LREE ∑HREE ∑LREE/∑HREE (La/Lu)UCC (La/Yb)UCC Ⅰ区 19 183.5 0.66 148.6 34.9 4.26 1.32 1.41 Ⅱ区 65 180.9 0.66 144.7 36.2 4.00 0.99 1.07 Ⅲ区 28 154.8 0.69 118.2 36.6 3.23 0.98 1.07 Ⅳ区 26 200.4 0.67 164.0 36.4 4.51 1.02 1.11 -
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