末次冰消期以来气候期划分的准确定位与定年  

Accurate Locating and Dating for Division of Climate Periods since the Last Deglaciation Stage

作　　者：覃嘉铭[1] 袁道先[1] 林玉石[1] 张美良[1] 章程[1] 王华[1] 冯玉梅[1] 涂林玲[1] 杨琰[1] 程海 R. Lawrence. Edwards 冉景丞 陈会明 

机构地区：[1]中国地质科学院岩溶地质研究所岩溶动力学重点实验室,广西桂林541004 [2]Geology and Geophysics Department,Minnesota University,MN55455, USA [3]国家级茂兰喀斯特森林自然保护处,贵州荔波558400

出　　处：《地球学报》2005年第B09期209-212,共4页Acta Geoscientica Sinica

基　　金：本文由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）;国家自然科学基金项目（批准号：40231008）;（批准号：90202016）及科技部面上项目（批准号：2003Dl溉J069）资助.

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16ka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。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 records, besides reflecting the variation of the monsoon intensity, can better reveal the abrupt change of climate during H1, BA and YD as well as 9 100 a, 8 200 a and 4 600 a in Holoeene. 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 global change records.

关 键 词：石笋记录 古气候分期 ^230TH定年 贵州荔波董歌洞 准确定位 气候期 末次冰消期 定年 碳同位素记录 氧同位素分析 

分 类 号：P532[天文地球—古生物学与地层学] G216[天文地球—地质学]