| 黄龙钙华210Pb计年与现代沉积的环境变化研究 |
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| 关键词:tufa 210Pb stable isotopes climatic change Huanglong |
| 基金项目:科技部基本科研业务费所控项目(编号: 200718) |
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| A Study of 210Pb Dating and Climatic Changes of Modern Sediments from Tufa in Huanglong, Sichuan Province |
| With the tufa core as the study object, the authors have reconstructed the high precision chronology and environmental records for the past one hundred years in Huanglong area using the 210Pb dating technique, which is effective for young carbonate samples and short time scale records. Based on an analysis of carbon and oxygen isotope data from the tufa core, this paper discusses the relationship between stable environmental isotopes and climatic data obtained by instruments with a comparison with other paleo-climatic records obtained by different dating techniques. The δ18O values changed from ?12.13‰ to ?10.42‰ during 1908-2004, with the average being ?11.23‰ and the variation range being 1.7‰. A comparison of δ18O values with Dongge Cave and Kahf Defore Cave in the same southwest monsoonal climate area and in the same study period shows that the δ18O values of the tufa core in Huanglong is higher than those of Cave records, probably attributed to the altitude effects and different distances from moisture source areas. It can be concluded that the tufa core records of Huanglong in the high alti-tude and middle latitude areas are more sensitive to climatic environmental changes than records of stalagmites in Dongge Cave and Kahf Defore Cave from low altitude areas. |
| WANG Hua,QIN Jia-ming,AN De-jun,YANG Yan,SUN Hai-long,LIN Yu-shan,YANG Xun-lin,YING Qi-he,ZHANG Qing-ming.2010.A Study of 210Pb Dating and Climatic Changes of Modern Sediments from Tufa in Huanglong, Sichuan Province[J].Acta Geoscientica Sinica,31(2):216-222. |
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