Enhanced metamorphic CO₂ release on the Proterozoic Earth.

ABSTRACT: Rock metamorphism releases substantial CO₂ over geologic timescales (>1 My), potentially driving long-term planetary climate trends. The nature of carbonate sediments and crustal thermal regimes exert a strong control on the efficiency of metamorphic CO₂ release; thus, it is likely that metamorphic CO₂ degassing has not been constant throughout time. The Proterozoic Earth was characterized by a high proportion of dolomite-bearing mixed carbonate-silicate rocks and hotter crustal regimes, both of which would be expected to enhance metamorphic decarbonation. Thermodynamic phase equilibria modeling predicts that the metamorphic carbon flux was likely ~1.7 times greater in the Mesoproterozoic Era compared to the modern Earth. Analytical and numerical approaches

SUBMITTER: Stewart EM 

PROVIDER: S-EPMC11459165 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature