渤海西部表层沉积物的稀土元素分布特征与物源约束

Distribution Characteristics of Rare Earth Elements and Their Provenance Constraints in the Surface Sediments from the Western Bohai Sea

对渤海西部44个表层沉积物样品进行电感耦合等离子体质谱法测试,分析了稀土元素(REE)含量,探讨了渤海西部稀土元素分布特征及其物源约束。结果表明,渤海西部表层沉积物的稀土配分模式与中国黄土的接近,表明研究区沉积物主要来自于周边大陆。渤海西部表层沉积物稀土元素富集与粒度效应研究表明,∑REE与Mg、Ti、Co、Cr、Li和细粒沉积物呈明显正相关,而与砂质沉积物呈显著负相关,与Zr无明显正或负的相关性。渤海西部表层沉积物稀土元素参数特征值离散图和Q-型聚类分析结果,可将研究海域沉积物划分为3个不同的地球化学分区,研究区中部和西北部海域为∑REE高值区,其物质主要来源于海河和黄河;研究区南部、东南部沉积物主要来源于黄河物质输入;研究区东北部滦河口外沉积物主要来源于滦河物质。

In this study, the authors analyzed the rare earth elements （REEs） of surface sediment samples collected from 44 stations in the western Bohai Sea using inductively coupled plasma-mass-spectrometry （ICP-MS）. The results show that the REE UCC normalization distribution pattern in surface sediments from the western Bohai Sea is similar to that in China＇s loess, indicating that the sediments in the study area are mainly derived from the mainland substance. As a result, the ~REE is positively correlated with Mg, Ti, Co, Cr, Li and the fine-grained sediments, and FREE is negatively correlated with the coarse-grained sediments. There is no significant positive or negative correlation between FREE and Zr. The REE content and parameters of characteristic values were analyzed by the Q cluster analysis, the study area is divided into 3 different geochemical regions. The central and northwest sediments from the western Bohai Sea have high∑REE and come mainly from the materials of the Haihe River and the Yellow River, the south and southeast sediments of the western Bohai Sea have come mainly from the material of the Yellow River, and the sediments off Luanhe River Estuary in the northeast region of the study area are from the Luanhe River.