永暑礁南永 3井岩心是我国首次完整地获得的环礁湖沉积高分辨率柱样 ,井深 5 90m ,全为松散的生物骨壳碎屑。通过高精度TIMS铀系测年计算了沉积速率。全井柱样全新世晚期 16 82aBP以来的平均沉积速率为 3 5mm/a,比同礁同期的礁坪沉积速率 1 2 1mm/a高 ,是高分辨率古环境研究的理想材料。以全湖沉积柱平均沉积速率为准 ,将全柱划分为 4个沉积速率高低交替阶段。这同祖国大陆近 170 0年来的气温波动、冷热分期的变化大体上一致 ,反映了南沙群岛地区对中国大陆乃至全球的气候变化的响应。 Yongshu reef Nanyong 3 well is the first complete high-resolution sedimentary column in the atolinghu of China with a depth of 5 90 m, all of which are loose biological shell detritus. The deposition rate was calculated by high-precision TIMS uranium dating. The average well sedimentation rate since 1682aBP in the late stage of the whole well was 3 5mm / a, which was higher than that of the same reef at the same period, which was an important material for the study of Paleozoic in high resolution. Based on the average deposition rate of sedimentary columns in Quanjiu Lake, the whole column is divided into four stages with high and low sedimentation rates. This is in line with the fluctuations in temperature in the motherland over the past 170 years. The changes in periods of cold and warm are broadly consistent, reflecting the response of the Nansha Islands region to climate change in mainland China and the world at large.