鸭绿江河口外海域柱状沉积物稀土元素的分布特征及物源指示

摘要

The core sediment CH01 was collected from the Yalu River Estuary. Subsequently, these samples were analyzed for rare earth element (REE) compositions and grain size parameters. The purposes of this paper are: to study the distributions of REE compositions in the core sediments; to compare the REE compositions between the sediments from Yalu River estuary and surrounding rivers; and to discuss their implications for sediment sources of this study area. The results indicated that, the sand was the main composition of core sediment CH01, and the average REE content in the core sediments was similar with the global average content. In addition, the sediments from the study area inclined to be typically terrigenous under Chondrite-normalized REE patterns. Furthermore, the REE differentiation characteristic parameters of the core sediment were significantly distinct from those of Yangtze River, Yellow River of China, and the rivers on the Korean Peninsula, and closer to that of Yalu River sediments. It demonstrated that material source in the study area was mainly from terrigenous clastic material.%通过对鸭绿江河口外海域CH01柱状样沉积物进行稀土元素（REE）地球化学分析，结合粒度参数研究，分析了其稀土元素地球化学特征，并与周边河流进行了对比，揭示了它的物质来源。结果显示：CH01柱状样沉积物以砂为主，稀土元素平均含量与全球沉积物稀土元素平均含量相当。经过球粒陨石标准化，发现其为典型的陆源沉积。CH01的主要稀土元素参数与长江、黄河及朝鲜半岛上的河流差异明显，与鸭绿江沉积物的分异特征最接近，说明研究区物质来源主要是鸭绿江径流输运的陆源碎屑物质。