| 黄土高原黄土和太平洋沉积物 Nd，Sr 同位素变化的比较 |
| |
| 关键词:Nd and Sr isotopes colian deposits loess plateau |
| 基金项目: |
|
| 摘要点击次数: 2604 |
| 全文下载次数: 2216 |
| 摘要: |
| A Comparison of Variations in Nd and Sr Isotopic Compositions between the Loess Plateau and the Pacific Sediments |
| 143Nd/144Nd and 87/Sr/86Sr rations of acid-washed residues of red clay and overlying loess-paleosols from the Lingtai profile in the loess plateau of China were determined. Sediments in central North Pacific Ocean have different fluctuations fo 87Sr/86Sr ratios from the Lingtai profile over the last 7.0 Ma. Nevertheless, fluctuations of ENd(0) in the Lingtai Profile from 7.0 Ma B P to the present are very similar to those of central North Pacific Ocean, which reflects the loess of the less plateau in China and sediments of central North Pacific Ocean are derived from the same source regions, and the source regions have been basically unchnged since 7.0 Ma B P. Red clay and the overlying loess-paleosol have very identical ENd (0). It can be inferred that both the red clay in the Loess Plateau and the overlying loess-paleoaols are probably of eolian origin and have the same source region. The phenomenon that most of the residues of red clay have higher 87Sr/86Sr ratios than the overlying loess-paleosols implies a climate of relatively high tempera ture and strong rainfall during the formaion of red clay. |
| YANG Jiedong,CHEN Jun,ZHANG Zhaofeng,JI Junfeng,CHEN Yang.2005.A Comparison of Variations in Nd and Sr Isotopic Compositions between the Loess Plateau and the Pacific Sediments[J].Acta Geoscientica Sinica,26(z1):192-194. |
| 查看全文 查看/发表评论 下载PDF阅读器 |