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地球学报  2004 

贵州荔波董歌洞D3石笋碳氧稳定同位素及微量元素记录的环境变化

Keywords: 碳、氧同位素,微量元素,古环境,石笋,贵州荔波

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Abstract:

通过对贵州荔波董歌洞D3石笋一系列的TIMSU系法测年以及碳氧稳定同位素分析,取得了连续90.0~160.0ka气候变化高分辨率的同位素记录。表明石笋氧同位素记录和海洋同位素记录一样,也可以明显地按峰、谷划分为MIS5c,MIS5d,MIS5e及MIS6多个气候阶段,界线年龄分别为:5c/5d为110.0kaBP,5d/5e为120.0kaBP,5e/6为129.2kaBP。在由冰盛期的6阶段到间冰期的5e,δ^18O值由偏重的谷底至偏轻的峰顶的跃变,代表冰期旋回之间由冷到暖的快速转变。此外,δ^13

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