Silicate melts are the main agent for transporting carbon from Earth’s interior to the surface. The carbon concentration in the atmosphere and the size of the carbon reservoir in oceans, sediments, and biomass are ultimately controlled by the balance between carbon removal through weathering, burial in sediments, and subduction on one hand and volcanic degassing on the other hand (e.g., Berner 1994). Carbon emissions from volcanoes may have ended the Neoproterozoic “snowball-Earth” glaciation (Hoffman et al. 1998) and they have been invoked as a potential mechanism that could link flood basalt eruptions to mass extinction events (...

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