Abstract:<p>Subduction of carbon-bearing phases throughout Earth&#8217;s history may be an important mechanism of sourcing carbon to the Earth&#8217;s lower mantle. As carbon has very low solubility in mantle silicates, it is primarily present in accessory phases such as carbonates, diamond, or metal carbides. Previous studies indicate that more than half of the carbonate contained in the oceanic crust may survive metamorphism and dehydration in the sub-arc and reach the lower mantle, even… Show more
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