| 控制北太平洋深水中 Pb、Nd 同位素演化的不同因素 |
| |
| 关键词:evolution of Pb-Nd isotopes Fe-Mn crusts North Pacific Ocean |
| 基金项目: |
|
| 摘要点击次数: 3101 |
| 全文下载次数: 2393 |
| 摘要: |
| Different Controls over Pb and Nd Isotope Evolution of the Central North Pacific Ocean |
| Nd and Pb isotopic dating results are presented for three ferromanganese crusts, whose ages are inferred to be～75 Ma.These data provide for the first time an opportunity to trace the Nd and Pb isotope evolution of central North Pacific seawater back to the latest Cretaceous. The three crusts, no matter they have been phosphatized or not,display very similar Pb and Nd isotope trends with age, suggesting no modification of the Pb and Nd isotope distribution by post-depositional phosphatization. The authors'data suggest that the isotope evolution of dissolved Pb in central North Pacific seawater has been mainly controlled by Pb released from eolian dust from North America prior to 50 Ma and from Asia after 40 Ma. In contrast,eolian dusts have had negligible contributions to the dissolved Nd in the central North Pacific deep water.The rise of Nd isotope ratios of Pacific seawater in Cenozoic was most likely caused by the increasing volcaic activity and erosion of the volcanic arcs around the Pacific Ocean. |
| LING Hongfei,JIANG Shaoyong,M.Frank,ZHOU Huaiyang,ZHOU Feng,LU Zunli,CHEN Xiaoming.2005.Different Controls over Pb and Nd Isotope Evolution of the Central North Pacific Ocean[J].Acta Geoscientica Sinica,26(z1):198. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|