摘要
利用湖泊沉积物中Rb/Sr值来反映受古气候制约的流域陆地化学风化率的变化,并恢复了岱海近400a以来以小冰期为特征的、具有100a准周期(经谱分析)的气候波动历史。通过磁化率、粘土矿物含量和种类的综合分析,确证了湖泊沉积物中Rb/Sr值的变化可以用来重建流域内化学风化率及与其相应的古气候演化过程,是湖泊沉积记录中具有比磁化率更明确气候意义的有效代用指标。
According to different geochemical behavior between rubidium and strontium during chemical weathering, variations of Rb/Sr ratios in the lake sediment sequence can be used as a good indicator of chemical weathering in watershed. We reconstructed the paleoclimatic change history in the Daihai Lake area during the last 400 years determined by the variations of Rb/Sr ratios in the lake sediment sequence, including the Little Ice Age and two post-glacial rebound. Spectrum analysis shows that the variation of Rb/Sr ratios has quasi periodicity of 100 years, and so does the paleoclimatic change. Combined analysis of magnetic susceptibility, clay minerals and contents yields paleoclimatic records which are more explicit than magnetic susceptibility which has been used as a good paleoclimatic indicator by many researchers.
出处
《地质论评》
CAS
CSCD
北大核心
2001年第1期42-46,共5页
Geological Review
基金
国家自然科学基金(编号40003001
49702028)
中国博士后基金
