|
|||||
|
|
| 青藏高原腹地湖泊沉积纪录的“仙女木期”古气候颤动事件 | |
| 引用本文： | 胡东生,张华京,李炳元,温景春.青藏高原腹地湖泊沉积纪录的“仙女木期”古气候颤动事件[J].地质学报,2002,76(2):272-278. |
| 作者姓名： | 胡东生 张华京 李炳元 温景春 |
| 作者单位： | 1. 湖南师范大学国土学院,长沙,410081 2. 湖南师范大学化学化工学院,长沙,410081 3. 中国科学院地理研究所,北京,100101 4. 中国科学探险协会,北京,100083 |
| 基金项目： | 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项目 |
| 摘 要： | 通过对青藏高原腹地钻孔岩心剖面的最新研究,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苟弄措湖泊沉积记录(孔深7.25 m)约30 ka BP以来的古气候变化,并在孔深3.32～1.98 m处识别出“仙女本期”的3个气候颤动事件,即:①老仙女术事件(孔深3.32～2.62 m);②中仙女本事件(孔深2.62～2.43 m);③新仙女本事件(孔深2.43～1.98 m)。这3个气候颤动事件都是以冷干时段开始、以冷湿时段结束的,并有越向后期其冷干的时段越长的变化趋势,而其后的冷湿时段却具有等时的变化趋势。岩心沉积物的有机碳、有机氮和磁化率以及化学元素含量的变化,都与仙女本期气候变化具有十分吻合的变化态势。仙女术期气候在湖泊沉积物中的响应,在青藏高原环境演化中还是首次发现,为研究第四纪末次冰期冰消期以来的气候变化提供了新的信息。 |
| 关 键 词： | 湖泊沉积气候记录 古气候综合响应因子 仙女木期气候颤动 仙女木事件 青藏高原腹地 |
| 修稿时间： | 2000年12月25 |
Paleoclimatic Oscillation Events of the Dryas Period: Evidence from the Record of Lake Records of Late Sediments in the Interior of the Qinghai-Tibet Plateau |
|
| HU Dongsheng,ZHANG Huajing,LI Bingyuan,WENG Jingchun College of Lan,Hunan Normal University,Changsh, College of Chemistry and Chemical Engineering,Hunan Normal University,Changsh, Institute of Geography,Chinese Academy of Sciences,Bei.Paleoclimatic Oscillation Events of the Dryas Period: Evidence from the Record of Lake Records of Late Sediments in the Interior of the Qinghai-Tibet Plateau[J].Acta Geologica Sinica,2002,76(2):272-278. | |
| Authors: | HU Dongsheng ZHANG Huajing LI Bingyuan WENG Jingchun College of Lan Hunan Normal University Changsh College of Chemistry and Chemical Engineering Hunan Normal University Changsh Institute of Geography Chinese Academy of Sciences Bei |
| Institution: | HU Dongsheng,ZHANG Huajing,LI Bingyuan,WENG Jingchun College of Lan,Hunan Normal University,Changsh, College of Chemistry and Chemical Engineering,Hunan Normal University,Changsh, Institute of Geography,Chinese Academy of Sciences,Bei |
| Abstract: | In the latest study of a section of the well core from the interior of the Qinghai-Xizang(Tibet) Plateau,the authors found the last 32 ka paleoclimatic change from the record of lake sediments of the Goulong Co in the Hoh Xil area by using the sequence stratigraphic and chronostratigraphic approaches, combined with the cli-matostratigraphic approach and recognized three climatic oscillation event of the Dryas period atdepths of 3. 32 to 1. 98 m of a well core, i. e. (1) the Oldest Dryas event (at well depths of 3. 32 to 2. 62 m), (2) the Older Dryas event (at 2. 62 to 2. 43 m) , and (3) the Younger Dryas event (at 2. 43 to 1. 98 m). All the three climat-ic oscillation events started with the dry and cold interval and ended with the cold and humid interval. The cold and dry interval became longer in the later part of the period, while the dry and humid stage shows a tendency of isochronic change. The variations of organic carbon, organic nitrogen, magnetic susceptibility and geochemi-cal element contents in core sediments all well coincide with the climatic change in the Dryas period. The re-sponse of the climate in the Dryas period in lake sediments is first discovered in the environmental evolution of the Qinghai-Tibet Plateau. This provides new information for the study of the climatic change since the deglaciation of the last glacial stage of the Quaternary. |
| Keywords: | climatic record of lake sediments synthetic response factor of paleoclimatic change paleocli- matic oscillation events of the Dryas Period Dryas events interior of the Qinghai-Tibet Plateau |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《地质学报》浏览原始摘要信息 | |
| 点击此处可从《地质学报》下载免费的PDF全文 | |