DOI: 10.1038/ngeo2627
论文题名: Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a
作者: Naafs B.D.A. ; Castro J.M. ; De Gea G.A. ; Quijano M.L. ; Schmidt D.N. ; Pancost R.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 2 起始页码: 135
结束页码: 139
语种: 英语
Scopus关键词: acidification
; anoxic conditions
; Aptian
; black shale
; calcification
; carbon cycle
; carbon dioxide
; carbon emission
; emplacement
; environmental change
; flood basalt
; nanoplankton
; ocean basin
; osmium isotope
; outcrop
; sea surface temperature
; volcanic gas
; Ontong Java Plateau
; Pacific Ocean
; Spain
; Tunisia
英文摘要: During the Aptian Oceanic Anoxic Event 1a, about 120 million years ago, black shales were deposited in all the main ocean basins. The event was also associated with elevated sea surface temperatures and a calcification crisis in calcareous nannoplankton. These environmental changes have been attributed to variations in atmospheric CO2 concentrations, but the evolution of the carbon cycle during this event is poorly constrained. Here we present records of atmospheric CO2 concentrations across Oceanic Anoxic Event 1a derived from bulk and compound-specific Î 13 C from marine rock outcrops in southern Spain and Tunisia. We find that CO2 concentrations doubled in two steps during the oceanic anoxic event and remained above background values for approximately 1.5-2 million years before declining. The rise of CO2 concentrations occurred over several tens to hundreds of thousand years, and thus was unlikely to have resulted in any prolonged surface ocean acidification, suggesting that CO2 emissions were not the primary cause of the nannoplankton calcification crisis. We find that the period of elevated CO2 concentrations coincides with a shift in the oceanic osmium-isotope inventory associated with emplacement of the Ontong Java Plateau flood basalts, and conclude that sustained volcanic outgassing was the primary source of carbon dioxide during Oceanic Anoxic Event 1a. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106085
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: Organic Geochemistry Unit, School of Chemistry, University of Bristol, Bristol, United Kingdom; Departamento Geologiá, CEACTierra, University of Jaén, Jaén, Spain; Departamento Química Inorgánica y Orgánica, CEACTierra, University of Jaén, Jaén, Spain; School of Earth Sciences, Cabot Institute, University of Bristol, Bristol, United Kingdom
Recommended Citation:
Naafs B.D.A.,Castro J.M.,De Gea G.A.,et al. Gradual and sustained carbon dioxide release during Aptian Oceanic Anoxic Event 1a[J]. Nature Geoscience,2016-01-01,9(2)