Low δ26Mg volcanic rocks of Tengchong in Southwestern China: A deep carbon cycle induced by supercritical liquids

This study reveals a new carbon cycle in which Mg-rich carbonate - dolomite - can be dissolved by supercritical liquids and subducted into a deep mantle wedge to depths of 120-300 km in the oceanic subduction zone. This deep metasomatic mantle wedge mixed with the upwelling mantle beneath the Tengchong volcano and partially melted to form the low δ26Mg volcanic rocks.