| Nd isotope as the tracer of seawater evolution of early Miocene in the eastern Pacific Ocean | |
| Liu, JH; Chen, LR; Wang, YX; Han, JX | |
| 2003-06-01 | |
| 发表期刊 | CHINESE SCIENCE BULLETIN
 |
| ISSN | 1001-6538 |
| 卷号 | 48页码:106-110 |
| 文章类型 | Article |
| 摘要 | Fifty-six samples of nannofossil ooze were collected from Core PC5794 in the northern equatorial Pacific at 5 em intervals. With the methods of mass spectrometer (VG354) and ICP, the Nd isotopic compositions (epsilon(Nd)(t)), Mn contents and Mg/Sr ratios of carbonate phase have been analyzed. CaCO3 contents of bulk sediments were obtained by dissolution of 0.5 mol/L HCl. Based on these data, the high-resolution epsilon(Nd)(t) profile of seawater in early Miocene with core depth(or time) have been established. The values of epsilon(Nd)(t) range from -6.2 to -2.97 and 4 fluctuation cycles existed during 24.06-22.02 Ma. 4 low epsilon(Nd)(t) values (about -6.4) correspond to high CaCO3 contents, which implicates that there were 4 cold epochs or 4 times of Antarctic Bottom Water activity. They occurred at the time of 24.06 Ma, 23.85 Ma, 22.88 Ma and 22.26 Ma, respectively. High epsilon(Nd)(t) values correspond to the high Mn contents and high values of Mg/Sr ratio, which indicates the existence of 4 intense hydrothermal activity periods during 24.06-22 Ma, the durations of them are 4.05-23.98 Ma, 23.69-23.15 Ma, 22.74-22.37 Ma and 22.06-22.02 Ma, respectively.; Fifty-six samples of nannofossil ooze were collected from Core PC5794 in the northern equatorial Pacific at 5 em intervals. With the methods of mass spectrometer (VG354) and ICP, the Nd isotopic compositions (epsilon(Nd)(t)), Mn contents and Mg/Sr ratios of carbonate phase have been analyzed. CaCO3 contents of bulk sediments were obtained by dissolution of 0.5 mol/L HCl. Based on these data, the high-resolution epsilon(Nd)(t) profile of seawater in early Miocene with core depth(or time) have been established. The values of epsilon(Nd)(t) range from -6.2 to -2.97 and 4 fluctuation cycles existed during 24.06-22.02 Ma. 4 low epsilon(Nd)(t) values (about -6.4) correspond to high CaCO3 contents, which implicates that there were 4 cold epochs or 4 times of Antarctic Bottom Water activity. They occurred at the time of 24.06 Ma, 23.85 Ma, 22.88 Ma and 22.26 Ma, respectively. High epsilon(Nd)(t) values correspond to the high Mn contents and high values of Mg/Sr ratio, which indicates the existence of 4 intense hydrothermal activity periods during 24.06-22 Ma, the durations of them are 4.05-23.98 Ma, 23.69-23.15 Ma, 22.74-22.37 Ma and 22.06-22.02 Ma, respectively. |
| 关键词 | Nd Isotope Seawater Evolution Eastern Pacific Ocean |
| 学科领域 | Multidisciplinary Sciences |
| DOI | 10.1360/01we0016 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000183335900016 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/3780 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Acad Sinica, Inst Oceanol, Qingdao 266071, Peoples R China 2.Guangzhou Marine Invest Bur, Guangzhou 510760, Peoples R China 3.Nanjing Univ, Modern Anal Ctr, Nanjing 210093, Peoples R China 4.Acad Sinica, Grad Sch, Beijing 100039, Peoples R China 5.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, JH,Chen, LR,Wang, YX,et al. Nd isotope as the tracer of seawater evolution of early Miocene in the eastern Pacific Ocean[J]. CHINESE SCIENCE BULLETIN,2003,48:106-110. |
| APA | Liu, JH,Chen, LR,Wang, YX,&Han, JX.(2003).Nd isotope as the tracer of seawater evolution of early Miocene in the eastern Pacific Ocean.CHINESE SCIENCE BULLETIN,48,106-110. |
| MLA | Liu, JH,et al."Nd isotope as the tracer of seawater evolution of early Miocene in the eastern Pacific Ocean".CHINESE SCIENCE BULLETIN 48(2003):106-110. |
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