贵州都匀七星洞石笋剖面晚更新世高分辨率的气候地层学  

A HIGH RESOLUTION LATE PLEISTOCENE CLIMATO-STRATIGRAPHY OF 4 STALAGMITES FROM QIXING CAVE, DUYUN, GUIZHOU

作　　者：覃嘉铭[1] 袁道先[1] 程海 林玉石[1] 张美良[1] 王华[1] 冯玉梅[1] 涂琳玲[1] 

机构地区：[1]中国地质科学院岩溶地质研究所,国土资源部岩溶动力学开放研究实验室,桂林541OO4 [2]Geology and Geophysics Department,Minnesota University,MN 55455,USA

出　　处：《第四纪研究》2004年第3期318-324,共7页Quaternary Sciences

基　　金：国家自然科学基金项目 (批准号 :40 2 3 10 0 8和 40 15 2 0 0 2 );国土资源部重点科技项目 (批准号 :95 0 110 4)资助

摘　　要：通过对贵州都匀七星洞 4根石笋 4 2件系统的TIMS2 30 Th测年及 6 94件稳定同位素分析 ,揭示的气候变化记录时限范围连续 1～ 15万年 ,稳定同位素样品平均分辨率晚期达 15 0～ 2 2 0a,早期达 4 4 0～ 5 30a。研究表明 ,石笋δ1 8O曲线 ,相当于海洋记录的终止点Ⅰ及终止点Ⅱ具有特别明显的突变 ,其年龄分别为 11.3kaB .P .及 12 9.3kaB .P .,应为晚更新世顶、底界线的准确年代。晚更新世与深海氧同位素记录MIS2～MIS5e相对应的气候地层单元,其界限年代也分别得到了明确的界定。相当于格陵兰冰芯记录、北大西洋沉积记录的YD事件、Heinrich气候突变事件 ,几个石笋记录取得了一致的准确定位及定年。其中YD事件为 12 .76～ 11.5 2kaB .P .;Heinrich事件的H1～H6分别为 17～ 15kaB .P .,2 4 .6kaB .P .,30 .5kaB .P .,39.3kaB .P .,4 7.8～ 4 6 .8kaB .P .以及 6 0 .4kaB .P .。对其与北大西洋沉积及格陵兰冰芯记录所揭示的短尺度气候突变事件的可比性 ,表明东亚季风气候变化 ,与高纬度地区的气候变化呈遥相关响应 ,对研究东亚季风气候驱动机制及其与全球气候变化的响应关系和对晚更新世的地层学研究 ,均具有特别重要的意义。Carbon and oxygen isotope records of 4 stalagmites from Qixing cave, Duyun, Guizhou gave us a relatively continuous Late Pleitocene paleoclimate record from 10～150ka with the resolution about 10 2～10 3a. The age control is mainly based on 42 TIMS U-series dating. It is indicated from δ 18 O curves that there are two abrupt changes at about 11 3kaB.P. and 129.3kaB.P., equivalent to termination Ⅰ and termination Ⅱ in the deep sea record respectively. The dating of these two abrupt changes may be considered as the top and bottom age of Late Pleistocene. The δ 18 O record in-between in this study can thus be correlated to the MIS2 to MIS5e. It is also possible for us to dating the main climatic events in our record: YD from 12.76kaB.P. to 11.52kaB.P., H1 to H6, 17～15kaB.P., 24.6kaB.P., 30.5 kaB.P. , 39.3kaB.P., 47.8～46.8kaB.P., and 60.4kaB.P. respectively. The fact that well correlation of short-term abrupt changes in our record to those from the sediments of the North Atlantic and ice core in Greenland reminds us of interconnection of the climatic events in the area prevailing over East-Asian monsoon to those in high latitudes. It is quite important for global Late Pleistocene climato-stratigraphy, the mechanism of East-Asian monsoon and the study dealing with the cause and response of global climate changes.

关 键 词：石笋 占δ^18O气候地层学 晚更新世 

分 类 号：P642.25[天文地球—工程地质学] P534[天文地球—地质矿产勘探]