摘要
上新世晚期以来,随着青藏高原的强烈隆升柴达木盆地急剧下沉,其第四系最大厚度达2800m,沉积连续,地层保存完好,地质事件记录完整。水6孔位于柴达木盆地中心,孔深910.10m。根据水6孔孢粉、古地磁和同位素年龄系统成果,区分出冷热交替的22个孢粉带,并估计了年代。水6孔的气候地层序列不仅在古气候的冷热变动上,而且在年代上都可与赤道太平洋 V28—238井的δ^(18)O 气侯记录阶段和中国洛川黄土—古土壤序列详细对比,说明距今0.8Ma 以来柴达木盆地的古气侯冷热变动具有全球意义。
Since the late of pliocene Qaidam basin has subsided rapidly following the violent up-heaval of Qinghai—Xizang plateau.With the maxium thickness 2200m,the Quaternary sedimentationis continuous and preserved completely,in which the geological events are fully recorded.Hole S_6,910.10m in depth,is situated in the center of Qaidam basin.According to the systematic results of sporo—pollen,paleomagnetism and isotopic ages in S_6,22sporo pollen zones.alternating of cold and warm climate,are divided and their age estimated.Not only on the cold and warm fluctuations of palcoclimate but also on their ages,the cli-matostratigraphic sequence of S_6 can be correlated in detail with the climatic recorded stages of δ^(18)O inEquatorial Pacific Well V28—238 and the loess—paleosoil sequence of L uoehuan in China,indicatingthat the cold and warm fluctuations of paleoclimate in Qaidam Basin have global significance since0.80 Ma B.P..
