DOI: 10.1016/j.epsl.2020.116599
论文题名: Evaluation of shallow-water carbonates as a seawater zinc isotope archive
作者: Zhao M. ; Tarhan L.G. ; Zhang Y. ; Hood A. ; Asael D. ; Reid R.P. ; Planavsky N.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 553 语种: 英语
中文关键词: carbonates
; modern
; proxy
; seawater
; Zn isotopes
英文关键词: Algae
; Carbonates
; Carbonation
; Isotopes
; Seawater
; Surficial sediments
; Analytical errors
; Carbonate sediments
; Isotopic composition
; Isotopic fractionations
; Isotopic signals
; Shallow water carbonates
; Track changes
; Zinc isotopes
; Zinc
; carbonate rock
; isotopic composition
; isotopic fractionation
; marine sediment
; seawater
; sediment chemistry
; shallow water
; water column
; zinc
; Arabian Sea
; Bahamas
; Indian Ocean
; Panama [Central America]
; Persian Gulf
; Chlorophyta
; Cyanobacteria
; Dichothrix
; Gastropoda
英文摘要: Carbonate zinc (Zn) isotopes have increasingly been used to track changes in seawater Zn isotopic composition. A large body of recent work, in particular studies conducted under the GEOTRACES program, have added significantly to our knowledge of how Zn behaves in the water column. However, our understanding of how water-column Zn isotopic signals become incorporated into carbonate sediments is at a much more nascent stage. To help solve this issue, we have measured the Zn isotopic composition of modern surficial and core-top carbonate sediments and seawater from the Bahamas, Panama, and the Persian Gulf. Whereas modern Bahamian seawater has a δ66Zn of 0.14 ± 0.12‰ (2σ), Bahamian carbonates show a large range of δ66Zn—from −0.56 to 1.11‰. The δ66Zn of carbonate mud is ∼0.3‰ higher than that of the Bahamian seawater, potentially due to Zn isotopic fractionation during precipitation. Carbonate ooids and peloids and certain skeletal and microbial aragonites, including gastropods, green algae, stromatolites and precipitates associated with cyanobacterial (Dichothrix) filaments, have δ66Zn indistinguishable, within analytical error, from that of modern seawater. This suggests that these carbonate phases may be promising archives for seawater δ66Zn. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165752
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 and Planetary Sciences, Yale University, 210 Whitney Ave, New Haven, CT 06511, United States; School of Earth Sciences, University of Melbourne, Parkville, Victoria, 3010, Australia; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33158, United States
Recommended Citation:
Zhao M.,Tarhan L.G.,Zhang Y.,et al. Evaluation of shallow-water carbonates as a seawater zinc isotope archive[J]. Earth and Planetary Science Letters,2021-01-01,553