利用泥炭重建长江三角洲南部地区15kaBP以来的海平面波动

摘要

This study presents a sea level curve from 15 ka BP to the present-day for the southern Yangtze delta plain, China. The curve is based on the radiocarbon dates and elevations from 58 samples of supratidal saltmarsh peat and peaty mud. The results indicate that the local relative sea level rose quickly (ca. 1 m/100 yr) during the periods 14–12 and 10–8 cal. ka BP. This rate of sea level rise then fel slowly towards the current rate from 8 to 6 cal. ka BP, and has remained stable since 5 cal. ka BP. These results suggest a step-like global sea level rise control ed by the melting of ice sheets.%　　通过分析分布于长江三角洲南部的58个海平面标志性沉积物(包括基底盐沼泥炭、基底盐沼泥炭质泥、植物碎屑层和高潮滩沉积)的年龄校正和高程数据,重建了长江三角洲南部地区15Cal kaBP以来的相对海平面波动曲线。结果显示14k~12kaBP、10k~8kaBP为海平面快速上升期,海平面上升速率平均达1m/百年；距今8k~6kaBP海平面呈现缓慢上升态势,海平面逐步接近甚至达到现今海平面位置,5kaBP海平面在小幅度的波动中趋于稳定。长江三角洲全新世海平面波动呈现阶梯式上升模式,冰川、冰盖活动是其主要控制因素。