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地球学报  2004 

末次冰期贵州七星洞石笋高分辨率气候记录与Heinrich事件

Keywords: 石笋,氧同位素记录,D-O旋回,Heinrich事件,凯酉七星洞

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Abstract:

通过对贵州都匀七星洞Q4、Q6石笋进行高精度的TIMS-U系测年和氧同位素分析,建立了末次冰期60.5kaBP以来都匀凯酉地区高分辨率的古气候变化时间序列。通过与格陵兰GISP2冰心的δ^18O曲线对比分析,初步揭示并探讨了末次冰期以来反映的短时间尺度气候快速变化的D-O旋回事件1-18和Heinrich事件H1~H5在黔南七星洞中的石笋记录,并对冷事件发生的年代给出了界定。研究表明,黔南60.5kaBP以来石笋记录冷暖事件所反映出的古季风环流变化,明显受北大西洋气候振荡的影响,显示与北极地区存在着古

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