New isotopic constraints on the role of continental weathering in the neodymium cycle of the Nordic Seas over the last 22,000 years
文献类型：期刊论文
| 作者 | Huang, Peng1,3; Hu, Ningjing2,3; Liu, Yanguang2,3; Wu, Dong2; He, Lianhua2; Sun, Xihao2; Lyu, Huahua2,3; Wang, Yingjing2; Zhang, Hui2; Shi, Xuefa2,3 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2025-11-20 |
| 卷号 | 696页码:14 |
| 关键词 | Authigenic epsilon Nd Weathering Neodymium isotope decoupling Ice Sheets Paleoceanography Nordic Seas |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2025.123107 |
| 通讯作者 | Hu, Ningjing(Huningjing@fio.org.cn) ; Shi, Xuefa(xfshi@fio.org.cn) |
| 英文摘要 | Neodymium isotopic composition (epsilon Nd) extracted from authigenic sediment phases has become a widely used proxy to track past changes in water masses and ocean circulation. The Nordic Seas are a key region of rare earth element exchange between seawater and particles, complicating reconstruction of past deep-water variability from epsilon Nd. Here, we present authigenic and detrital epsilon Nd records from the deep northern Norwegian Sea to assess how glacial fluctuations and shifts in sediment provenance regulate the supply of mineral phases, and how these processes, in turn, shape seawater epsilon Nd. Results showed that, homogeneous authigenic epsilon Nd values across the Nordic Seas during the LGM and the late Holocene (< 4 kyr BP) were primarily controlled by deep-water mixing rather than local sediment inputs. By contrast, the last deglaciation (18-10 kyr BP) shows large epsilon Nd variability linked to Barents-Kara Sea sediments. These labile-rich sediments contain high kaolinite/illite ratios, organic carbon and pyrite. We propose that these labile materials from the Barents-Kara Sea are more efficient at exchanging Nd with seawater than sediments generated by intense physical erosion during glacial periods. Accordingly, deep-water epsilon Nd was mainly governed by partially soluble sediments and/or desorption from Barents-Kara Sea deposits. Long-term changes in authigenic epsilon Nd were closely linked to the relative inputs from the Barents-Kara Sea, regulated by the retreat of the Svalbard-Barents Sea Ice Sheet (SBIS) and the Fennoscandia Ice Sheet (FIS) during the deglaciation. Thus, fluctuations in the advance and retreat of the SBIS and FIS largely dictated deep-water epsilon Nd. This finding underscores the pivotal role of glaciers in regulating Nd cycling and glacially derived nutrients in high-latitude regions. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; NORTH-ATLANTIC ; DEEP-WATER ; ICE-SHEET ; ND ISOTOPE ; ARCTIC-OCEAN ; THERMOHALINE CIRCULATION ; RAPID CHANGES ; FRAM STRAIT ; EPSILON-ND |
| 资助项目 | National Natural Science Foundation of China[42076079] ; National Natural Science Foundation of China[41676053] ; National Natural Science Foundation of China[42130412] ; National Key Research and Development Program of China[2023YFF0804601] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001605612700003 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203689]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Hu, Ningjing; Shi, Xuefa |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 2.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao, Peoples R China 3.Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Peng,Hu, Ningjing,Liu, Yanguang,et al. New isotopic constraints on the role of continental weathering in the neodymium cycle of the Nordic Seas over the last 22,000 years[J]. CHEMICAL GEOLOGY,2025,696:14. |
| APA | Huang, Peng.,Hu, Ningjing.,Liu, Yanguang.,Wu, Dong.,He, Lianhua.,...&Shi, Xuefa.(2025).New isotopic constraints on the role of continental weathering in the neodymium cycle of the Nordic Seas over the last 22,000 years.CHEMICAL GEOLOGY,696,14. |
| MLA | Huang, Peng,et al."New isotopic constraints on the role of continental weathering in the neodymium cycle of the Nordic Seas over the last 22,000 years".CHEMICAL GEOLOGY 696(2025):14. |
入库方式： OAI收割
来源：海洋研究所
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