东海中陆架泥质区及其周边底质中钙、锶、钡的地球化学特征

The Geochemical Characteristics of Ca, Sr, Bain the Surface Sediments of the Middle Continental ShelfMud Area and Its Ambient Areas in the East China Sea

元素含量分析表明东海北部近岸泥质区以低Ｓｒ、相对低Ｃａ和最低的Ｓｒ／Ｂａ为特征；中陆架砂质区低Ｃａ、相对低Ｓｒ和相对低的Ｓｒ／Ｂａ；中陆架泥质区高Ｃａ、Ｓｒ、低Ｂａ和高的Ｓｒ／Ｂａ；外陆架砂质区具有最高的Ｃａ、Ｓｒ和Ｓｒ／Ｂａ。Ｃａ、Ｓｒ、ＰＩＣ三者关系密切，Ｂａ与Ｃａ、Ｓｒ、ＰＩＣ的相关性均差。Ｃａ、Ｓｒ具明显的亲自生性，主要赋存于海洋生源碳酸盐；Ｂａ具明显的亲它生性，主要赋存于硅酸盐矿物。Ｃａ、Ｓｒ、Ｂａ的地球化学特征受研究区物源和水动力环境的强烈制约。海洋生物地球化学过程对Ｃａ和Ｓｒ的地球化学特征有重要影响。中陆架泥质区是东海北部现代陆架Ｃａ、Ｓｒ的“汇”

The element analyses of Ca, Sr, and Ba of 31 surface sediment samples taken from the middle continental shelf and its ambient areas of the East China Sea were carried out by using methods of AAS and ICPAES. The results show that the distribution pattern of the three elements is: low Sr, relatively low Ca and lowest ratios of Sr/Ba in the coastal mud area; low Ca, relatively low Sr and ratio of Sr/Ba in the middle continental shelf sand area; high Ca and Sr and ratio of Sr/Ba in the middle continental shelf mud area; highest Ca, Sr and ratio of Sr/Ba in the outer continental shelf sand area. The conentrations of Ca have a good relation to the concentrations of Sr and PIC (Particulate Inorganic Carbon). And the concentrations of Ba have little relation to the concentrations of Ca, Sr, and PIC. It is indicated that the geochemical characteristics of Ca, Sr and Ba are controlled by the sources of elements and dynamic environment in the study area. The interior influential factor affecting the geochemical characteristics of Ca, Sr and Ba is the ocurrence characters of the three elements. Also, the processes of marine geochemistry play an important role in the characteristics of Ca and Sr in the study area. It is supposed that the middle continental shelf mud area is the sink of the modern Ca and Sr in the Northern East China Sea.