摘要
利用东海陆架泥质沉积区和周围砂质沉积区的表层沉积物元素含量和海水悬浮沉积物总量分析资料 ,对泥质区的沉积地球化学进行了比较研究。结果表明东海不同泥质区的沉积地球化学过程很不相同。浙江近岸泥质区沉积物元素以Fe、Mn、Zn的含量高 ,Na、Sr、Al、Ca的含量低为特征 ,其地球化学特征与长江沉积物非常一致。近岸泥质区的沉积物基本来源于长江输入海的沉积物 ,在台湾暖流的作用下沉积在浙江沿岸。远岸济州岛西南泥质区沉积物以Na、Sr的高含量 ,较高的Al、Ca含量和低的Fe、Mn、Zn含量为特征 ,其地球化学特征与黄河源沉积物有好的相关性 ,但有一定的混合源性质 ,该泥质区的沉积物主要来源于黄河源的细颗粒沉积物 ,由黄海沿岸流搬运到该区并沉积下来。沉积物在搬运沉积过程中 ,元素粒度分异作用明显。东海陆架泥质区沉积地球化学过程的控制性影响因子是东海环流系统和物源 。
The comparison of sedimentary geochemistry for mud areas on the East China Sea continental shelf (ECSCS) was carried out based on the contents of elements of surface sediments and concentrations of total suspended sediments (TSS) in the seawater from mud areas and their ambient sand areas. The results show that the processes of sedimentary geochemistry of different mud areas on ECSCS are very different. The surface sediments from the Zhejiang Coastal Mud Area (ZCMA) occupy high contents of Fe, Mn, Zn and low contents of Na, Sr, Al and Ca. The geochemical characters of surface sediments from ZCMA have a very close correspondence to those of Changjiang (Yangtze River) sediments, indicating that almost all sources of sediments in ZCMA are from modern Changjiang discharge sediments in addition to a little bit biogenic sediments. The modern Changjiang sediments to the sea are deposited in the Zhejiang Coast because of the obstruction of Taiwan Warm Current. Whereas, the surface sediments from the Southwestern Cheju Island Mud Area (SCIMA) are characterized with high contents of Na, Sr, relative high contents of Al, Ca and low contents of Fe, Mn, Zn. The geochemical characters of surface sediments from SCIMA have a good relation to those of Huanghe (Yellow River) source. But there are somewhat mixed characters including biogenic and other source sediments in SCIMA. It is indicated that the main source of sediments in SCIMA is from fine-grained sediments of Huanghe source. The Huanghe source sediments are chiefly from the resuspended sediments in the old Huanghe estuary located in the Northern Jiangsu province. Then, the Huanghai (Yellow Sea) Coastal Current transports the fine-grained sediments from old Huanghe estuary to the SCIMA. Therefore, the controlling factors for the sedimentary geochemistry of different mud areas on ECSCS are the current system in the East China Sea and the source of sediments. Especially, the Taiwan Warm Current plays a key role to the sedimentary geochemistry division between ZCMA and SCIMA in the study area.
出处
《沉积学报》
CAS
CSCD
北大核心
2000年第2期284-289,共6页
Acta Sedimentologica Sinica
基金
国家自然科学基金! (批准号 :4 96 76 2 89)资助项目
关键词
东海
陆架泥质区
沉积地球化学
表层沉积物
surface sediments geochemical characteristics sedimentation source mud areas on the East China Sea continental shelf
