| 末次水消期以来气候期划分的准确定位与定年 |
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| 引用本文：覃嘉铭,袁道先,林玉石,张美良,章程,王华,冯玉梅,涂林玲,杨琰,程海,R.Lawrence.Edwards,冉景丞,陈会明.2005.末次水消期以来气候期划分的准确定位与定年[J].地球学报,26(z1):209-212. |
| DOI：10.3975/cagsb.2005.s1.70 |
| 摘要点击次数: 4218 |
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| 基金项目:国土资源地质调查项目“西南岩溶地区地下水与环境地质”（批准号：1212010340104）、国家自然科学基基项目（批准号：40231008）、（批准号：90202016）及科技部面上项目（批准号：2003DEB6J069）资助。 |
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| 中文摘要:对贵州荔波董歌洞D4石笋的再次高密度230Th测年及碳、氧同位素分析，在16 ka 以来的部分，平均分辨率达 18a 。研究表明，氧同位素记录除反映季风的强弱变化外，能更好地揭示 H1，BA，YD以及全新世中 9.1ka，8.2ka、4.6ka 气候突变事件。碳同位素记录和沉积速率则能更好地反映气候干湿的变化。石笋记录对气候期的正确划分及突变事件的准确定位及定年，可为全球变化其他记录的研究提供一个可靠时间系列的基准标尺。 |
| 中文关键词:石笋记录 古气候分期 230TH定年 贵州荔波董歌洞 |
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| Accurate Locating and Dating for Division of Climate Periods since the Last Deglaciation Stage |
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| Abstract:The high resolution 230Th dating and C O isotope analysis performed again by the authors for D4 stalagmite samples from Dongge cave in Libo, Guizhou Province,show an average resolution of 18 a for the part produced since 16 ka. The study indicates that the oxygen isotope reords, besides reflecting the variation of the monsoon intensity, can better reveal the abrupt change of climate during H1, BA and YD as well as 9100 a ,8200 a and 4600 a in Holocene. The carbon isotope records and sedimentation rates are most likely to reflect the humidity of climate. In conclusion, the correct division of climate periods and accurate location and dating of the mutation event obtained from stalagmite records provide a basic scale of reliable time series for the studies of other glodal change records. |
| keywords:stalagmite records division of climate peiod 230Th dating Dongge cave in Libo Guizhou |
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