【作者】 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；

【Author】 QIN Jiaming YUAN Daoxian LIN Yushi ZHANG Meiliang ZHANG Cheng WANG Hua FENG Yumei TU Linling YANG Yan CHENG Hai R. Lawrence. Edwards RAN Jingcheng CHEN Huiming Institute of Karst Geology, CAGS, Karst Dynamic Laboratory, MLR, Guilin , Guangxi , 541004 Geology and Geophysics Department, Minnesota University, MN55455, USA The Management of Maolan National Nature Reserve , Libo , Guizhou , 558400

【机构】 中国地质科学院岩溶地质研究所岩溶动力学重点实验室； Geology and Geophysics Department Minnesota University,MN55455,USA； 国家级茂兰喀斯特森林自然保护处；

【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9.1 ka,8.2 ka、4.6 ka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。更多还原

【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 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 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 global change records.更多还原