Stable Nd isotopic fractionation in REY-rich deep-sea sediments
文献类型：期刊论文
| 作者 | Bai, Jianghao3; Deng, Yinan2; Wu, Hao1,3; Liang, Xirong3; Yu, Xiaoxiao3; Zhang, Ganglan2; Wei, Gangjian3 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2025-02-15 |
| 卷号 | 652页码:12 |
| 关键词 | Stable Nd isotope Isotopic fractionation Sequential extraction REY-rich deep-sea sediments |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2024.119197 |
| 英文摘要 | Stable Nd isotope ratios are regarded as a potential tracer for marine rare earth elements (REEs) cycling. However, the fractionation behavior of Nd in marine geological processes has not yet been constrained. This study investigates the bulk and leachate compositions (phosphate, Fe-Mn oxides, and aluminosilicates) of a Ndenriched deep-sea sediment core in the western Pacific for both the stable and radiogenic Nd isotopes. The epsilon Nd values of the bulk sediments range from -6.2 to -5.1, indicating a basically consistent source material throughout the core. Compared to the Bulk Silicate Earth (BSE), the core shows enrichment in heavy Nd isotopes, suggesting that marine authigenic components play a key role in controlling the stable Nd isotope behavior. In the phosphate phase, Nd content correlates positively with P2O5 and CaO contents (R2 = 0.97 and R2 = 0.96, respectively), while the stable Nd isotopic compositions exhibit limited variability (0.076 %o +/- 0.055 %o), suggesting that phosphates have the potential to reconstruct the stable Nd isotope composition of paleo-seawater. For Fe-Mn oxide phases, Mn content initially correlates with Nd content and stable Nd isotope composition, and then exhibit a negative relationship, which suggests that Fe-Mn (hydr)oxides initially adsorb heavier 146Nd from seawater and subsequently release it into pore water. The bulk sediment illite abundance and Al2O3 content correlate with bulk Nd content (R2 = 0.55 and R2 = 0.62, respectively) in aluminosilicate phases, but not with stable Nd isotope composition, indicating that illite controls Nd distribution within this phase without causing stable isotope fractionation. These results elucidate the behavior of stable Nd isotope fractionation in REY-rich deep-sea sediments and provide a fundamental understanding of stable Nd isotopes as a tracer for marine REEs cycling. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001407784900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82618]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Deng, Yinan; Wei, Gangjian |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Guangzhou Marine Geol Survey, MNR Key Lab Marine Mineral Resources, Guangzhou 510075, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bai, Jianghao,Deng, Yinan,Wu, Hao,et al. Stable Nd isotopic fractionation in REY-rich deep-sea sediments[J]. EARTH AND PLANETARY SCIENCE LETTERS,2025,652:12. |
| APA | Bai, Jianghao.,Deng, Yinan.,Wu, Hao.,Liang, Xirong.,Yu, Xiaoxiao.,...&Wei, Gangjian.(2025).Stable Nd isotopic fractionation in REY-rich deep-sea sediments.EARTH AND PLANETARY SCIENCE LETTERS,652,12. |
| MLA | Bai, Jianghao,et al."Stable Nd isotopic fractionation in REY-rich deep-sea sediments".EARTH AND PLANETARY SCIENCE LETTERS 652(2025):12. |
入库方式： OAI收割
来源：广州地球化学研究所
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