摘要
利用湖泊自生碳酸盐δ１８Ο、δ１３Ｃ指标，研究了青藏高原东部边缘若尔盖盆地９０万年来的环境演化特征，划分了２３个气候阶段，并与黄土记录及深海记录进行了比较。结果显示，各记录９０万年来气候演化阶段及变化趋势具有较好的可比性，但环境特点也存在较大的差异。表明９０万年来若尔盖地区气候变化具有全球一致性的同时也存在有明显的区域特征。ＲＭ孔记录显示在２３、１７、１２等阶段暖而不湿，而１８、１６等阶段冷而不干，钻孔记录揭示的６阶段环境特征也是不同于其它任何记录。另外，在７００—４８０ｋａＢ．Ｐ．时段气候以冷湿暖干为主，明显不同于此时段前后各期的气候特征，也与黄土高原黄土—古土壤系列所揭示的冷干暖湿型气候格局形成鲜明的对照，显示了明显的区域特征。
According to δ 18 O and δ 13 C of authicarbonate,the environmental characteristics in the Zoige region,the edge of the eastern Tibet Plateau,in the past 900ka has been studied.The results showed that the process of climatic evolution could be divided into 23 stages,which were compared with the records of deep sea and loess.By comparing these records,we found that climatic stages in these records were well corresponding to each other,but there also existed obvious differences,indicating that the features of environmental evolution in the Zoige Basin over the past 900ka had a global consistence,and also had an apparently regional aspect.The climate in stages 23,17 and 13 recorded in core RM was warm,but not wet.During stages 18 and 16,on the contrary,the climate was cold,but not dry.The records of δ 18 O and δ 13 C of authicarbonate in core RM also showed that the environment in stage 6 was distinct from others and that during the period of 780—480kaB.P.the climate was different from these prior to and after the period,and also sharply different from the records of deep sea and loess,indicating that the environmental evolution in the Zoige Basin in the past 900ka had obvious regional features.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1997年第4期63-71,共9页
Marine Geology & Quaternary Geology
基金
国家"八五"攀登计划
