| 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 |
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| 引用本文：覃嘉铭,袁道先,程海,林玉石,张美良.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[J].地球学报,25(6):625-632. |
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| 基金项目:国家自然科学基金项目(批准号:49632100)及(40152002);国土资源部重点科技项目(批准号:9501104) |
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| 中文摘要:通过对贵州荔波董歌洞D3石笋一系列的TIMS U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120.0ka BP，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 |
| 中文关键词:碳、氧同位素 微量元素 古环境 石笋 贵州荔波 |
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| The Stable Isotope and Trace Element Records on Environmental Change of D3 Stalagmite in Dongge Cave, Libo, Guizhou |
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| Abstract:Through a lot of TIMS-U series dating and the carbon oxygen stable isotope analysis of D 3 stalagmite form Dongge Cave, Libo, Guizhou, the authors obtained high resolution isotope record of climatic changes from 90 000 to 160 000 a successively. The study indicates that the stalagmitic oxygen isotope records are identical with the sea isotope record.Accoding to the peaks and the valley, they can be divides into MIS5c, MIS5d, MIS5e and MIS6 climates stage, with the boundaries being 5c/5d 110 ka B P, 5d/5e 120 ka B P, 5e/6 129.2 ka B P respectively. From 6 flourishing stages to the Interglacial 5e, the δ 18O value jumped from the heavy valley to the light peak, representing therapid change of the glacial cycle from cold to warm. The δ 13C values also show similar rapid changes from the valley to the peak, suggesting the rapid change of the ecological environment with the climatic change. Systematic trace element analysis indicates that Si, Al, Sr, P, F and some other elements all show very remarkable changes from the 6 glacial flourishing stages to the Interglacial 5e stage. In the Interglacial epoch, the trace element change are smaller, and the change curve is more similar to the δ 13C record. Researches show that, like the δ 13C records, these trace elements can also serve as indicators for the reconstruction of the karst area ecological environment. |
| keywords:C.O-isotopes trace elements paleoenvironment stalagmite Libo, Guizhou |
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