Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles

doi:10.1016/j.epsl.2024.118902

IOCAS-IR > 海洋地质与环境重点实验室

	Impact of riverine sediment mineralogy on seawater Nd isotope compositions in the northeastern part of the Indian Ocean during the last two glacial cycles
	Huang, Yi 1,2; Colin, Christophe 2; Bassinot, Franck 3; Yu, Zhaojie 4; Dubois-Dauphin, Quentin 2; Dapoigny, Arnaud 2; Wilson, David J.5; Bayon, Germain 6
	2024-10-01
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
卷号	643 页码:13
通讯作者	Colin, Christophe(christophe.colin@universite-paris-saclay.fr)
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.
关键词	Foraminiferal epsilon Nd Weathering River discharge Mineralogy Bay of Bengal
DOI	10.1016/j.epsl.2024.118902
收录类别	SCI
语种	英语
资助项目	Natural Environment Research Council independent research fellowship[NE/T011440/1]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001281201200001
出版者	ELSEVIER
WOS关键词	DEEP-WATER FORMATION ; DISSOLVED NEODYMIUM ; BAY ; CIRCULATION ; ATLANTIC ; BENGAL ; HIMALAYAN ; NORTHERN ; HOLOCENE ; PENETRATION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186172
专题	海洋地质与环境重点实验室
通讯作者	Colin, Christophe
作者单位	1.Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China 2.Univ Paris Saclay, CNRS, GEOPS, F-91405 Orsay, France 3.Univ Paris Saclay, Lab Sci Climat & Environm, IPSL, CEA,CNRS,UVSQ, F-91191 Gif Sur Yvette, France 4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 5.Univ London, Univ Coll London & Birkbeck, Inst Earth & Planetary Sci, Gower St, London WC1E 6BT, England 6.Univ Brest, CNRS, Ifremer, Geoocean, F-29280 Plouzane, 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.