青藏高原腹地湖泊沉积对第四纪晚期古季风变化的响应  

Lake sediments responded for the ancient monsoonal change of the late Quaternary Period in the Inland of Qinghai-Xizang Plateau

作　　者：胡东生[1] 张华京[2] 徐冰[3] 李炳元[4] 孔照辰[5] 温景春 

机构地区：[1]湖南师范大学资源环境科学学院 [2]湖南师范大学化学化工学院,湖南长沙410081 [3]中国海洋大学地球科学学院,山东青岛266001 [4]中国科学院地理科学与资源研究所,北京100101 [5]中国科学院植物研究所,北京100093 [6]中国科学探险协会,北京100083

出　　处：《干旱区地理》2006年第4期483-489,共7页Arid Land Geography

基　　金：国家科委;中国科学院;国家环保局;青海省可可西里地区综合科学考察基金项目;淮海工学院自然科学基金项目共同资助成果

摘　　要：通过对青藏高原腹地的综合科学考察和对中心钻孔岩芯剖面的最新研究,用层序地层学与年代地层学和气候地层学相结合的方法,分辨出可可西里地区湖泊沉积记录(孔深7.25 m)的第四纪晚期距今3万余年以来的古气候变化,沉积物磁化率等因子综合表征的高原古季风变化是波动发展的,发生在仙女木期地质环境事件中的季风活动具有强烈暴发的特点,是高原季风发展中的突变事件,而且地表热点效应对其起到了激发作用。综合分析的研究成果表明,它的变化频谱与激变因子及其运行机制是伴随着青藏高原地质效应的演变而发展的,为研究第四纪冰消期以来的气候变化提供了新的信息。Based on results of the comprehensive science investigation in the inland of the Qinghai- Xizang（Tibet） plateau and the newest research on the core profile of the center boring hole, the use method to combine together for with the layer sequence stratigraphy and the age stratigraphy learn and the climatic stratigraphy, this paper distinguished out the paleoclimate change with lake sediment records of the Kekexili region （ the boring depth is 7.25 m） since of the late Quaternary period （30 000 a BP）, the paleomonsoonal change of the plateau shows the undulate development expressed by the compound factors such as sediments magnet suscepti- bility, the monsoon activity occurrences have the characteristics of intense breaking-out in the geology environment events of the Dryas period, which are mutation events in the monsoon activity of the plateau and are stimulated by the heat point effect of the earth surfaces. The research results on the overall analysis enunciates that the changing frequency charts and the cataclysmic factors of the paleo-climate change and its movement mechanism have developed along with geological evolution of the Qianghai- Xizang （Tibet） plateau, which provides the new information for the climatic change since the post- glacial period of the Quaternary era.

关 键 词：湖泊沉积气候记录 古季风变化频谱 第四纪晚冰期环境 青藏高原腹地 

分 类 号：P532[天文地球—古生物学与地层学]