DOI: 10.1016/j.epsl.2019.115951
论文题名: Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits
作者: Blättler C.L. ; Bergmann K.D. ; Kah L.C. ; Gómez-Pérez I. ; Higgins J.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 532 语种: 英语
英文关键词: calcium isotopes
; evaporite
; Proterozoic
; seawater chemistry
; sulfate
Scopus关键词: Isotopes
; Organic carbon
; Oxygen
; Seawater
; Calcium isotopes
; Evaporites
; Proterozoic
; Seawater chemistry
; sulfate
; Sulfur compounds
; calcium
; chemostratigraphy
; evaporite
; isotopic composition
; organic carbon
; Proterozoic
; seawater
; sulfate
; uncertainty analysis
英文摘要: Marine sulfate (SO4 2−) is intimately connected to the global carbon and oxygen cycles through its important role as an electron acceptor for the microbial respiration of organic carbon. The biogeochemical feedbacks within the sulfur, carbon, and oxygen cycles may have changed through time, reflecting changes in the concentration of sulfate in the oceans. Unfortunately, there is much uncertainty about the size of the marine sulfate reservoir throughout Earth history. In particular, conflicting estimates for marine sulfate exist during the latest Neoproterozoic, an interval of time associated with striking changes in Earth system evolution and oxidation: published interpretations of fluid inclusion chemistry place sulfate greater than 16 mmol/kg, whereas other interpretations of carbonate-associated sulfate data suggest concentrations less than 2 mmol/kg. Calcium isotope ratios in evaporite successions provide an independent method for deriving semi-quantitative constraints on sulfate concentrations, as well as other properties of seawater chemistry. Here, the calcium isotope behavior of bedded sulfate evaporites from ∼1050 Ma (Baffin and Bylot Islands, Nunavut, Canada), ∼830 Ma (Officer Basin, Western Australia), and ∼545 Ma (South Oman Salt Basin, Sultanate of Oman) are examined. In combination with other geological observations, the results suggest relatively low, millimolal-level sulfate in the latest Mesoproterozoic and a more specific range of 6–10 mmol/kg sulfate during the latest Neoproterozoic. These new constraints suggest that previous interpretations of sulfate concentrations and seawater chemistry need to be revised, opening up new possible solution spaces for the major ion composition of seawater. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159286
Appears in Collections: 气候变化与战略
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作者单位: Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States; Department of Geosciences, Princeton University, Princeton, NJ, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, United States; Petroleum Development Oman, Muscat, Oman
Recommended Citation:
Blättler C.L.,Bergmann K.D.,Kah L.C.,et al. Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits[J]. Earth and Planetary Science Letters,2020-01-01,532