DOI: 10.1038/ngeo2844
论文题名: Constraints on ocean carbonate chemistry and pCO2 in the Archaean and Palaeoproterozoic
作者: Blättler C.L. ; Kump L.R. ; Fischer W.W. ; Paris G. ; Kasbohm J.J. ; Higgins J.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 1 起始页码: 41
结束页码: 45
语种: 英语
Scopus关键词: alkalinity
; Archean
; atmospheric gas
; calcium
; carbon cycle
; carbon dioxide enrichment
; carbonate
; climate conditions
; climate variation
; early Earth
; Proterozoic
; sediment chemistry
; water chemistry
英文摘要: One of the great problems in the history of Earth's climate is how to reconcile evidence for liquid water and habitable climates on early Earth with the Faint Young Sun predicted from stellar evolution models. Possible solutions include a wide range of atmospheric and oceanic chemistries, with large uncertainties in boundary conditions for the evolution and diversification of life and the role of the global carbon cycle in maintaining habitable climates. Increased atmospheric CO2 is a common component of many solutions, but its connection to the carbon chemistry of the ocean remains unknown. Here we present calcium isotope data spanning the period from 2.7 to 1.9 billion years ago from evaporitic sedimentary carbonates that can test this relationship. These data, from the Tumbiana Formation, the Campbellrand Platform and the Pethei Group, exhibit limited variability. Such limited variability occurs in marine environments with a high ratio of calcium to carbonate alkalinity. We are therefore able to rule out soda ocean conditions during this period of Earth history. We further interpret this and existing data to provide empirical constraints for carbonate chemistry of the ancient oceans and for the role of CO2 in compensating for the Faint Young Sun. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105863
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geosciences, Princeton University, Princeton, NJ, United States; Department of Geosciences, Pennsylvania State University, University ParkPA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; CRPG, UMR 7358, CNRS, Université de Lorraine, Vandoeuvre-lès-Nancy, France
Recommended Citation:
Blättler C.L.,Kump L.R.,Fischer W.W.,et al. Constraints on ocean carbonate chemistry and pCO2 in the Archaean and Palaeoproterozoic[J]. Nature Geoscience,2017-01-01,10(1)