气候变化领域集成服务门户(CCPortal): Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate

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DOI	10.1073/pnas.2007797118
	Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate
	Nava A.H.; Black B.A.; Gibson S.A.; Bodnar R.J.; Renne P.R.; Vanderkluysen L.
发表日期	2021
ISSN	00278424
卷号	118 期号:14
英文摘要	A 2 to 4 C warming episode, known as the Latest Maastrichtian warming event (LMWE), preceded the Cretaceous Paleogene boundary (KPB) mass extinction at 66.05 0.08 Ma and has been linked with the onset of voluminous Deccan Traps volcanism. Here, we use direct measurements of melt-inclusion CO2 concentrations and trace-element proxies for CO2 to test the hypothesis that early Deccan magmatism triggered this warming interval. We report CO2 concentrations from NanoSIMS and Raman spectroscopic analyses of melt-inclusion glass and vapor bubbles hosted in magnesian olivines from pre-KPB Deccan primitive basalts. Reconstructed melt-inclusion CO2 concentrations range up to 0.23 to 1.2 wt% CO2 for lavas from the Saurashtra Peninsula and the Thakurvadi Formation in the Western Ghats region. Trace-element proxies for CO2 concentration (Ba and Nb) yield estimates of initial melt concentrations of 0.4 to 1.3 wt% CO2 prior to degassing. Our data imply carbon saturation and degassing of Deccan magmas initiated at high pressures near the Moho or in the lower crust. Furthermore, we find that the earliest Deccan magmas were more CO2 rich, which we hypothesize facilitated more efficient flushing and outgassing from intrusive magmas. Based on carbon cycle modeling and estimates of preserved lava volumes for pre-KPB lavas, we find that volcanic CO2 outgassing alone remains insufficient to account for the magnitude of the observed latest Maastrichtian warming. However, accounting for intrusive outgassing can reconcile early carbon-rich Deccan Traps outgassing with observed changes in climate and atmospheric pCO2. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon release; Deccan Traps; End-Cretaceous; Magmatic outgassing; Paleoclimate
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179987
作者单位	Department of Earth and Environmental Sciences, The Graduate Center of New York, City University of New York, New York, NY 10016, United States; Department of Earth and Atmospheric Sciences, The City College of New York, City University of New York, New York, NY 10031, United States; Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom; Department of Geosciences, Virginia Tech, Blacksburg, VA 24060, United States; Department of Earth and Planetary Science, University of California, Berkeley, CA 94720-4767, United States; Berkeley Geochronology Center, Berkeley, CA 94709, United States; Department of Biodiversity Earth and Environmental Science, Drexel University, Philadelphia, PA 19104, United States
推荐引用方式 GB/T 7714	Nava A.H.,Black B.A.,Gibson S.A.,et al. Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate[J],2021,118(14).
APA	Nava A.H.,Black B.A.,Gibson S.A.,Bodnar R.J.,Renne P.R.,&Vanderkluysen L..(2021).Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate.Proceedings of the National Academy of Sciences of the United States of America,118(14).
MLA	Nava A.H.,et al."Reconciling early Deccan Traps CO2 outgassing and pre-KPB global climate".Proceedings of the National Academy of Sciences of the United States of America 118.14(2021).