江苏王港潮间带表层碳酸盐的沉积特征

Sedimentary Properties of Surficial Carbonates in Wanggang Intertidal Flat,Jiangsu

利用容量法对江苏王港淤泥质海岸潮间带夏季表层沉积物碳酸盐的含量进行测定。结果表明 ,碳酸盐含量的空间分布呈现出由岸向海方向递减的大趋势 ;相关分析表明 ,总的碳酸盐含量与沉积物的平均粒径有比较显著的相关关系 (α=0 0 1 ) ;沉积物组分及粒径频率曲线对比分析表明王港潮间带表层沉积物碳酸盐主要富集于细颗粒部分 ,潮水沟系统和生物作用 (尤其是有孔虫 )加强了碳酸盐在细颗粒部分的富集。沉积物碳酸盐含量可以作为物源分析的一个指标 ,王港地区沉积物碳酸盐含量表明该地区沉积物主要来源于废黄河三角洲和现代黄河的输入 。

Ocean is a big bank of carbonates ,it contains abundant CO 2 and carbonates,and the ocean carbonates plays an important rule in global carbonate circulation.Volumetric analysis is used in the text to test the carbonate contents in the surficial sediments in summer in the muddy costal intertidal flat in Wanggang,Jangsu.The measured results show that the special distribution of the carbonate content is in a trend of decrease from bank to sea;and the correlation analysis reveals that a distinct correlation relationship (α=0.01) is present in the total carbonate contents and the sediments;the contrast analysis of sediment components and grain size frequency curves indicate that the carbonates of surficial sediments in Wanggang intertidal flat are mainly enriched in fine grained sediment,and the enrichment process in the fine sediments is intensified by the tidal system and biological activities (eg.foraminiferal).The carbonate content in the sediments may be served as an index for the mass origin;the carbonate contents in Wanggang sediments are mainly originated from the input of delta coast of the abandoned Yellow River and modern Yellow River,while the sediments from the Yangtze River are relatively few.