DOI: 10.1016/j.epsl.2020.116216
论文题名: Pervasive sources of isotopically light zinc in the North Atlantic Ocean
作者: Lemaitre N. ; de Souza G.F. ; Archer C. ; Wang R.-M. ; Planquette H. ; Sarthou G. ; Vance D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539 语种: 英语
中文关键词: GEOTRACES
; GEOVIDE
; North Atlantic
; zinc isotopes
; zinc sources
英文关键词: Hot springs
; Isotopes
; Sedimentology
; Zinc
; GEOTRACES
; GEOVIDE
; North Atlantic
; Zinc isotopes
; Zinc sources
; Oceanography
; concentration (composition)
; data set
; hydrothermal vent
; isotopic composition
; sediment analysis
; source apportionment
; zinc
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: In this study, we report seawater dissolved zinc (Zn) concentration and isotope composition (δ66Zn) from the GEOTRACES GA01 (GEOVIDE) section in the North Atlantic. Across the transect, three subsets of samples stand out due to their isotopically light signature: those close to the Reykjanes Ridge, those close to the sediments, and those, pervasively, in the upper ocean. Similar to observations at other locations, the hydrothermal vent of the Reykjanes Ridge is responsible for the isotopically light Zn composition of the surrounding waters, with an estimated source δ66Zn of -0.42 ‰. This isotopically light Zn is then transported over a distance greater than 1000 km from the vent. Sedimentary inputs are also evident all across the trans-Atlantic section, highlighting a much more pervasive process than previously thought. These inputs of isotopically light Zn, ranging from -0.51 to +0.01 ‰, may be caused by diffusion out of Zn-rich pore waters, or by dissolution of sedimentary particles. The upper North Atlantic is dominated by low δ66Zn, a feature that has been observed in all Zn isotope datasets north of the Southern Ocean. Using macronutrient to Zn ratios to better understand modifications of preformed signatures exported from the Southern Ocean, we suggest that low upper-ocean δ66Zn results from addition of isotopically light Zn to the upper ocean, and not necessarily from removal of heavy Zn through scavenging. Though the precise source of this isotopically light upper-ocean Zn is not fully resolved, it seems possible that it is anthropogenic in origin. This view of the controls on upper-ocean Zn is fundamentally different from those put forward previously. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165099
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH-Zürich, Zürich, Switzerland; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; CNRS, Univ Brest, IRD, Ifremer, LEMAR, Plouzane, F-29280, France
Recommended Citation:
Lemaitre N.,de Souza G.F.,Archer C.,et al. Pervasive sources of isotopically light zinc in the North Atlantic Ocean[J]. Earth and Planetary Science Letters,2020-01-01,539