气候变化领域集成服务门户(CCPortal): Carbonatites as a record of the carbon isotope composition of large igneous province outgassing

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DOI	10.1016/j.epsl.2020.116076
	Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
	Gales E.; Black B.; Elkins-Tanton L.T.
发表日期	2020
ISSN	0012821X
卷号	535
英文摘要	Large igneous province (LIP) eruptions have been linked in some cases to major perturbations of Earth's carbon cycle. However, few observations directly constrain the isotopic composition of carbon released by LIP magmas because carbon isotopes fractionate during degassing, which hampers understanding of the relative roles of mantle versus crustal carbon reservoirs. Carbonatite magmatism associated with LIPs provides a unique window into the isotopic systematics of LIP carbon because the majority of carbon in carbonatites crystalizes rather than degassing. Although the volume of such carbonatites is small, they offer one of the few available constraints on the mantle carbon originally hosted in other more voluminous magma types. Here, we present new δ13C data for the Guli carbonatites in the Siberian Traps. In addition, we compile ∼260 published measurements of δ13C from carbonatites related to the Deccan Traps and the Paraná-Etendeka. We find no evidence for magmas with carbon isotope ratios lighter than depleted mantle values of δ13C=−6±2‰ from any of these LIPs, though some carbonatites range to heavier δ13C. We attribute relatively heavy δ13C in some carbonatites to either slightly 13C-enriched domains in the mantle lithosphere or carbon isotope fractionation in deep, carbon-saturated LIP magma reservoirs. The absence of a light δ13C component in LIP magmas supports the view that lithospheric carbon reservoirs must be tapped during cases of LIP magmatism linked with sharp negative carbon isotope excursions and mass extinctions. © 2020 Elsevier B.V.
关键词	carbon cycle carbonatite large igneous province Siberian Traps δ13C
英文关键词	Degassing; Isotopes; Carbon cycles; Carbon isotope composition; Carbon isotope fractionation; Carbonatites; Isotopic systematics; Large igneous provinces; Negative carbon isotope excursions; Siberian Traps; Carbon; carbon cycle; carbon isotope; carbonatite; degassing; igneous geochemistry; isotopic composition; isotopic fractionation; large igneous province; reservoir characterization; Siberia
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/202590
作者单位	Department of Earth and Atmospheric Sciences, City College of New York, City University of New York, 160 Convent Avenue, New York City, NY 10017, United States; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States
推荐引用方式 GB/T 7714	Gales E.,Black B.,Elkins-Tanton L.T.. Carbonatites as a record of the carbon isotope composition of large igneous province outgassing[J],2020,535.
APA	Gales E.,Black B.,&Elkins-Tanton L.T..(2020).Carbonatites as a record of the carbon isotope composition of large igneous province outgassing.Earth and Planetary Science Letters,535.
MLA	Gales E.,et al."Carbonatites as a record of the carbon isotope composition of large igneous province outgassing".Earth and Planetary Science Letters 535(2020).