globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116076
论文题名:
Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
作者: Gales E.; Black B.; Elkins-Tanton L.T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164968
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Gales E.,Black B.,Elkins-Tanton L.T.. Carbonatites as a record of the carbon isotope composition of large igneous province outgassing[J]. Earth and Planetary Science Letters,2020-01-01,535
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