【摘要】 对南海北部12°以北海域表层沉积物中的浮游有孔虫丰度、属种数量与组合、碳酸盐含量以及硅质生物相对丰度等进行了分析和鉴定,结果表明:随水深的增加,浮游有孔虫的丰度降低、属种数量减少,碳酸盐含量降低,硅质生物相对丰度升高,浮游有孔虫优势种由易溶种转变为抗溶种。浮游有孔虫以及碳酸盐含量等的这些变化与深海碳酸盐的溶解作用密切相关,同时,浊流沉积作用和水团等环境因素也是影响浮游有孔虫丰度与组合以及碳酸盐含量变化的重要因子。更多还原

【Abstract】 Based on the distribution of planktonic foraminiferal abundance,species number and assemblage,abundance ratio of siliceous microfossils and carbonate content in the surface sediment in the northern South China Sea,it has been found that abundance and species number of planktonic foraminifera and carbonate content decrease rapidly with the increase of water depth,while the abundance of siliceous microfossils increase with the water depth.The dominant species in planktonic foraminiferal fauna change from dissolution-susceptible to dissolution-resistant species with the increase of water depth.It is inferred that the enhanced carbonate dissolution with the water depth is a key factor on controlling the distribution of planktonic foraminifera,abundance of siliceous and calcareous microfossils,and carbonate content in the deep sea in the northern South Sea.The results indicate that the CCD is located at some 3 500 m water depth,and the carbonate lysocline is situated at 2 500 m water depth.更多还原