Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles
文献类型：期刊论文
| 作者 | Huang, Yi5,6; Colin, Christophe6; Bassinot, Franck1; Yu, Zhaojie2; Dubois-Dauphin, Quentin6; Dapoigny, Arnaud6; Wilson, David J.4; Bayon, Germain3 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 643页码:13 |
| 关键词 | Foraminiferal epsilon Nd Weathering River discharge Mineralogy Bay of Bengal |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2024.118902 |
| 通讯作者 | Colin, Christophe(christophe.colin@universite-paris-saclay.fr) |
| 英文摘要 | Radiogenic neodymium isotope compositions (epsilon Nd) are used as a tracer for water mass circulation and continental weathering at different timescales. However, uncertainties remain in the relative roles of these two factors in driving past seawater epsilon Nd variability in settings under the influence of terrestrial or riverine sediment inputs. In this study, Nd isotopes of mixed planktonic foraminifera species and delta O-18 and delta C-13 of Cibicidoides wuellerstorfi were analyzed on three cores from the northeastern Indian Ocean to better assess the impact of lithogenic inputs from Himalayan rivers and deep-water hydrological changes on the past epsilon Nd distribution in the Bay of Bengal (BoB). Our epsilon Nd data indicate relatively homogenous and radiogenic values (from -8.4 to -7.5) during glacial periods in the BoB, similar to the composition of glacial water masses of the Southern Ocean. In contrast, interglacials were characterized by more unradiogenic epsilon Nd and a pronounced north-south gradient of similar to 4.5 epsilon Nd units (from -12.9 to -8.5) in bottom water, similar to the present-day distribution in the BoB, pointing to a strong lithogenic control by seawater-particulate interactions. Notably, this significant decoupling of the local Nd isotope signature from the Southern Ocean composition occurred when Himalayan riverine inputs were dominated by the erosion of Indo-Gangetic plain soils during interglacial periods, whereas the preferential delivery of fresh primary mineral assemblages during glacial periods appears to have had little impact on Nd exchange with seawater. These findings provide direct evidence that the degree of seawater-particulate exchange at continental margins is governed by the mineralogy of riverine inputs, with further implications for the use of Nd isotopes as palaeoceanographic tracers. |
| WOS关键词 | DEEP-WATER FORMATION ; DISSOLVED NEODYMIUM ; BAY ; CIRCULATION ; ATLANTIC ; BENGAL ; HIMALAYAN ; NORTHERN ; HOLOCENE ; PENETRATION |
| 资助项目 | Natural Environment Research Council independent research fellowship[NE/T011440/1] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001281201200001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/186171]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Colin, Christophe |
| 作者单位 | 1.Univ Paris Saclay, Lab Sci Climat & Environm, IPSL, CEA,CNRS,UVSQ, F-91191 Gif Sur Yvette, France 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.Univ Brest, CNRS, Ifremer, Geoocean, F-29280 Plouzane, France 4.Univ London, Univ Coll London & Birkbeck, Inst Earth & Planetary Sci, Gower St, London WC1E 6BT, England 5.Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China 6.Univ Paris Saclay, CNRS, GEOPS, F-91405 Orsay, France |
| 推荐引用方式 GB/T 7714 | Huang, Yi,Colin, Christophe,Bassinot, Franck,et al. Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles[J]. EARTH AND PLANETARY SCIENCE LETTERS,2024,643:13. |
| APA | Huang, Yi.,Colin, Christophe.,Bassinot, Franck.,Yu, Zhaojie.,Dubois-Dauphin, Quentin.,...&Bayon, Germain.(2024).Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles.EARTH AND PLANETARY SCIENCE LETTERS,643,13. |
| MLA | Huang, Yi,et al."Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles".EARTH AND PLANETARY SCIENCE LETTERS 643(2024):13. |
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来源：海洋研究所
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