Stable tungsten isotopic composition of seawater over the past 80 million years

doi:10.1130/G51208.1

	Stable tungsten isotopic composition of seawater over the past 80 million years
	Yang, Ruiyu 1,2,3; Stubbs, Daniel 4; Elliott, Tim 4; Li, Tao 5; Chen, Tianyu 1; Paytan, Adina 6; Kemp, David B.7,8; Ling, Hongfei 1; Chen, Jun 1; Hein, James R.9
刊名	GEOLOGY
	2023-08-01
卷号	51 期号:8 页码:728-732
ISSN号	0091-7613
DOI	10.1130/G51208.1
通讯作者	Li, Gaojun(ligaojun@nju.edu.cn)
英文摘要	The isotopic composition of seawater provides valuable information on how the Earth system has evolved. Here we present the stable tungsten isotopic composition (5186/184W) of seawater recorded in three ferromanganese (Fe-Mn) crusts spanning the past 80 million years in the Pacific. The 5186/184W of Fe-Mn crusts displays a pronounced decrease of & SIM;0.2%0 from 60 Ma to 40 Ma followed by a stable value of & SIM;0%0 since ca. 40 Ma. Multiple lines of evidence indicate an invariable equilibrium isotopic fractionation between Fe-Mn crusts and seawater. The consistent variations in 5186/184W in the three Fe-Mn crusts also indicate limited alteration by deposition regime or diagenetic overprinting. Thus, the 5186/184W of FeMn crusts reflects mainly that of seawater. A simple mass-balance calculation and comparison to other proxies suggest that the early Cenozoic decrease of seawater 5186/184W was most likely caused by decreased W isotopic fractionation between seawater and W sinks linked to shifting sedimentation regimes. We propose that increased burial of organics and decreased Fe-Mn oxide (FMO) sedimentation may result in a smaller isotopic fractionation associated with W sinks by limiting the adsorption of W from the water column onto FMOs in openocean sediments. Our results demonstrate the potential of 5186/184W as a novel paleo-proxy for global biogeochemical cycling.
资助项目	NSFC[41991325] ; NSFC[41877351] ; NSF[0449732]
WOS关键词	DEEP-WATER ; ND ISOTOPES ; HISTORY ; PB ; MO ; STRATIGRAPHY ; ADSORPTION ; EVOLUTION ; RECORD ; HF
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMER, INC
WOS记录号	WOS:001045559200005
资助机构	NSFC ; NSF
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42611]
专题	中国科学院南京地质古生物研究所
通讯作者	Li, Gaojun
作者单位	1.Nanjing Univ, Dept Earth & Planetary Sci, Nanjing 210023, Peoples R China 2.Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany 3.GEOMAR Helmholtz Ctr Ocean Res, D-24148 Kiel, Germany 4.Univ Bristol, Sch Earth Sci, Bristol BS8 1RJ, England 5.Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 6.Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA 7.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol, Wuhan 430074, Peoples R China 8.China Univ Geosci, Sch Earth Sci, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Peoples R China 9.US Geol Survey, Santa Cruz, CA 95060 USA
推荐引用方式 GB/T 7714	Yang, Ruiyu,Stubbs, Daniel,Elliott, Tim,et al. Stable tungsten isotopic composition of seawater over the past 80 million years[J]. GEOLOGY,2023,51(8):728-732.
APA	Yang, Ruiyu.,Stubbs, Daniel.,Elliott, Tim.,Li, Tao.,Chen, Tianyu.,...&Li, Gaojun.(2023).Stable tungsten isotopic composition of seawater over the past 80 million years.GEOLOGY,51(8),728-732.
MLA	Yang, Ruiyu,et al."Stable tungsten isotopic composition of seawater over the past 80 million years".GEOLOGY 51.8(2023):728-732.