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通过对南海东北部(12°～22°N,116°～122°E)表层沉积中的浮游有孔虫、底栖有孔虫、钙质超微化石、硅质与钙质生物丰度和比值的定量分析以及碳酸盐含量的测定,发现碳酸盐含量、浮游有孔虫、钙质超微化石丰度以及钙质生物比值随水深的增大迅速减小,而底栖有孔虫占有孔虫全群的比值和硅质生物比值以及底栖有孔虫胶结质壳类的百分含量却随水深的增大迅速增加.研究表明,调查区内微体化石丰度和比值以及碳酸钙含量的高低,与碳酸盐溶跃面(lysocline)和碳酸盐补偿深度密切相关,碳酸盐溶跃面和碳酸盐补偿深度南、北还存在一定差异,碳酸盐溶跃面南部较北部深,南部在2600m上下,北部则在2200m上下;碳酸盐补偿深度也是南部的较深,南部为3 600 m上下,而北部在3 400 m上下。
Based on the abundance of phytoplankton, benthic foraminifera, calcareous nannofossils, siliceous and calcareous minerals in the surface sediments of the northeastern South China Sea (12 ° ~22 ° N, 116 ° ~122 ° E) and The quantitative analysis of the ratio and the determination of carbonate content showed that carbonate content, planktonic foraminifera, calcareous microfossil abundance and calcareous biomass ratio decreased rapidly with the increase of water depth, while the benthic foraminifera The ratio of the total foraminifera and the ratio of siliceous organisms, and the percentages of the benthic foraminifera-conchostracans rapidly increased with the increase of water depth.The results showed that the abundance and ratio of fossil microscopic fossils in the survey area, The level of calcium is closely related to the carbonate lysosline and the depth of carbonate compensation. There are some differences between the carbonate flooding surface and the depth of carbonate compensation in the south and the north. The carbonate leaching surface The southern part is deeper than the northern part, with a depth of 2600m in the south and a maximum of 2200m in the north. The depth of carbonate compensation is also deep in the south, 3 600 m in the south and 3 400 m in the north.