气候变化领域集成服务门户(CCPortal): Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations

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DOI	10.1038/s41467-021-26467-6
	Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations
	Heimdal T.H.; Goddéris Y.; Jones M.T.; Svensen H.H.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	The emplacement of the Karoo Large Igneous Province (LIP) occurred synchronously with the Toarcian crisis (ca. 183 Ma), which is characterized by major carbon cycle perturbations. A marked increase in the atmospheric concentration of CO2 (pCO2) attests to significant input of carbon, while negative carbon isotope excursions (CIEs) in marine and terrestrial records suggest the involvement of a 12C-enriched source. Here we explore the effects of pulsed carbon release from the Karoo LIP on atmospheric pCO2 and δ13C of marine sediments, using the GEOCLIM carbon cycle model. We show that a total of 20,500 Gt C replicates the Toarcian pCO2 and δ13C proxy data, and that thermogenic carbon (δ13C of −36 ‰) represents a plausible source for the observed negative CIEs. Importantly, an extremely isotopically depleted carbon source, such as methane clathrates, is not required in order to replicate the negative CIEs. Although exact values of individual degassing pulses represent estimates, we consider our emission scenario realistic as it incorporates the available geological knowledge of the Karoo LIP and a representative framework for Earth system processes during the Toarcian. © 2021, The Author(s).
语种	英语
scopus关键词	assessment method; carbon cycle; carbon isotope; degassing; large igneous province; marine sediment; methane; Toarcian; Karoo; South Africa
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250589
作者单位	Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway; Géosciences-Environnement Toulouse, CNRS-Université Paul Sabatier, Toulouse, France
推荐引用方式 GB/T 7714	Heimdal T.H.,Goddéris Y.,Jones M.T.,et al. Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations[J],2021,12(1).
APA	Heimdal T.H.,Goddéris Y.,Jones M.T.,&Svensen H.H..(2021).Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations.Nature Communications,12(1).
MLA	Heimdal T.H.,et al."Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations".Nature Communications 12.1(2021).