北黄海沉积速率及其沉积通量  

SEDIMENTATION RATE AND FLUX OF THE NORTH YELLOW SEA

作　　者：齐君[1] 李凤业[1] 宋金明[1] 高抒[2] 王桂芝[1] 程鹏[1] 

机构地区：[1]中国科学院海洋研究所海洋生态与环境科学重点实验室 [2]南京大学海岸与海岛开发教育部重点实验室,南京210093

出　　处：《海洋地质与第四纪地质》2004年第2期9-14,共6页Marine Geology & Quaternary Geology

基　　金：国家杰出青年科学基金资助项目(49925614;49725612);山东省自然科学基金资助项目(H74990247)

摘　　要：黄海大陆架沉积物多来自黄河的输入,区域性环流模式控制着这些沉积物的输送过程。目前对浅海陆架沉积物沉积过程和沉积环境的研究很少,尤其是北黄海沉积物的堆积过程和沉积通量。我们对9个沉积岩心进行了210Pb分析测定,绘制了210Pb活度的垂直分布图,并计算了沉积通量,北黄海沉积通量为0 06～1 18g/(cm2·a),北黄海中部泥质区沉积通量低于0 33g/(cm2·a)。大多数的210Pb垂直分布呈两层分布模式,不同的垂直分布反映了水动力和沉积过程的时空变化。为了评价北黄海的物源和沉积环境,测定了10个表层沉积物样品的化学元素含量,测定结果表明北黄海泥质区沉积物是多源沉积,但其主要来源还是黄河的输入。The Yellow Sea continental shelf receives large quantities of sediment from the Yellow River. Regional circulation patterns control the transport of this sediment. Comparatively, little attention has been paid to the sedimentation processes and the sedimentary environments on the shallow shelf; thus, the vertical sediment flux in the North Yellow Sea is poorly understood. Nine cores collected from the North Yellow Sea by the R/V “Gold Star” were used to examine the processes of sediment accumulation and sedimentation flux.^(210)Pb analysis and the^(210)Pb activity profiles showed that vertical sediment flux ranged from 0.06 to 1.18 g·cm^(-2)·a^( -1) in the region. In the central part of the North Yellow Sea, there is a patch of fine-grained mud, with the sediment flux being lower than 0.33 g·cm^(-2)·a^( -1) at Station C4 (Station C1: 0.06 g·cm^(-2)·a^(-1); Station C2: 0.07 g·cm^(-2)·a^( -1);Station C3: 0.20 g·cm^(-2)·a^( -1)). Most of the^(210)Pb profiles were characterized by a two-segment model. Differences in the profiles reflected spatial and temporal variations in hydrodynamic and sedimentary processes. In order to determine the material source and sedimentary environment in the North Yellow Sea, chemical elements Ca, Fe, Sr, Cu, Ti and Rb of 10 surficial deposit samples were measured. The geochemistry characteristics showed that in the central North Yellow Sea the mud deposit had multi-source nature in terms of sediment supply, with a main source from the Yellow (River.)

关 键 词：沉积速率 沉积通量 黄海 ^210Ph活度 沉积岩心 

分 类 号：P736.21[天文地球—海洋地质] P722.5[天文地球—海洋科学]