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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
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Carbonatites as a record of the carbon isotope composition of large igneous province outgassing

机译：碳酸石作为大火省碳同位素组成的记录放气

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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 delta C-13 data for the Guli carbonatites in the Siberian Traps. In addition, we compile similar to 260 published measurements of delta C-13 from carbonatites related to the Deccan Traps and the Parana-Etendeka. We find no evidence for magmas with carbon isotope ratios lighter than depleted mantle values of delta C-13 = -6 +/- 2 parts per thousand from any of these LIPs, though some carbonatites range to heavier delta C-13. We attribute relatively heavy delta C-13 in some carbonatites to either slightly C-13-enriched domains in the mantle lithosphere or carbon isotope fractionation in deep, carbon-saturated LIP magma reservoirs. The absence of a light delta C-13 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. (C) 2020 Elsevier B.V. All rights reserved.
机译：在某些情况下，大型火油省（LIP）爆发已将地球碳循环的主要扰动联系在一起。然而，很少有观察结果直接限制唇魔岩浆释放的碳的同位素组成，因为脱气过程中的碳同位素分馏，这妨碍了对地壳与地壳碳储层的相对责任的理解。与唇缘相关的碳酸石岩岩岩浆为唇碳的同位素系统提供了独特的窗口，因为碳酸石中的大多数碳结晶而不是脱气。虽然这种碳酸石的体积很小，但它们提供了最初载于其他更大的岩浆类型的地幔碳上的少数可用限制之一。在这里，我们为西伯利亚陷阱中的Guli Carbonatites提供了新的Delta C-13数据。此外，我们编制了类似于与DECCAN陷阱和PARANA-ETENDEKA相关的Carta C-13的260次发布测量。我们发现没有碳同位素比的魔法魔术比从这些嘴唇中的任何一种从任何δC-13 = -6 +/- 2份千分之一的斑点值较轻的证据。虽然一些碳酸盐肌范围较重的Delta C-13。我们将某些碳酸盐肌中的相对较重的Delta C-13归因于岩石岩层或碳同位素分馏中的略微C-13富集的结构型在深的碳饱和唇岩岩浆储层中。在唇缘中没有光ΔC-13组分支持观点，即在与尖锐的负碳同位素偏移和大规模灭绝连接的唇岩岩岩岩状岩体的情况下必须挖掘岩石碳储存器。 （c）2020 Elsevier B.v.保留所有权利。

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