气候变化领域集成服务门户(CCPortal): Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits

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DOI	10.1016/j.epsl.2019.115951
	Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits
	Blättler C.L.; Bergmann K.D.; Kah L.C.; Gómez-Pérez I.; Higgins J.A.
发表日期	2020
ISSN	0012821X
卷号	532
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.
关键词	calcium isotopes evaporite Proterozoic seawater chemistry sulfate
英文关键词	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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202497
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
推荐引用方式 GB/T 7714	Blättler C.L.,Bergmann K.D.,Kah L.C.,et al. Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits[J],2020,532.
APA	Blättler C.L.,Bergmann K.D.,Kah L.C.,Gómez-Pérez I.,&Higgins J.A..(2020).Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits.Earth and Planetary Science Letters,532.
MLA	Blättler C.L.,et al."Constraints on Meso- to Neoproterozoic seawater from ancient evaporite deposits".Earth and Planetary Science Letters 532(2020).