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对南海西南陆坡SCS 1 2柱状样中微体化石进行定量统计以及稳定同位素分析和AMS14 C测年 ,求取末次冰消期高分辨率的古海洋学记录 .约 1 3kaBP以来南海南部的古海洋呈阶段变化 ,其中氧同位素 1 /2期界线约 1 2 .0 5kaBP和末次冰消期末约 7.70kaBP前后为两个快速变化期 (终止期IA 和终止期IB) ,其间则为缓慢变化期 .据推测 ,南海海平面在终止期IA 之前相对于现代的大致位于 - 1 1 0m处 ,终止期IB 之后与现代的相近 ,而其间则大致位于 - 5 0m附近 .与此相应 ,1 2 .0 5kaBP以来 ,冬季平均表层海水温度和盐度明显增高 ,表层古生产力下降 ;而约 7.70kaBP出现早全新世CaCO3 保存峰事件 ,翼足类丰度和CaCO3 含量显著增多 .
The quantitative oceanographic statistics, stable isotope analysis and AMS14 C dating of the SCS 1 2 columnar samples from the Southwest China Sea on the South China Sea slope were used to obtain the paleo-oceanographic records with the high resolution of the last ice age. There were two rapid change stages (terminal IA and terminal IB) before and after the oxygen isotope 1/2 cycle and about the last 7.70kaBP at the end of the last stage of ice retardation, with a slow change period. It is speculated that the sea level of the SCS before the termination of IA is generally located at -110m relative to the present, and the termination of IB is similar to that of the modern one, with a distance of around 50m in the meantime.120 Since 5kaBP, average surface water temperature and salinity in winter increased significantly, while paleoproductivity decreased in the surface layer. However, the peak of the CaCO_3 preservation peak appeared at about 7.70ka BP, and the abundance of wingfoot and CaCO3 increased significantly.