Mineral carbonation of peridotite fueled by magmatic degassing and melt impregnation in an oceanic transform fault.

ABSTRACT: Most of the geologic CO₂ entering Earth's atmosphere and oceans is emitted along plate margins. While C-cycling at mid-ocean ridges and subduction zones has been studied for decades, little attention has been paid to degassing of magmatic CO₂ and mineral carbonation of mantle rocks in oceanic transform faults. We studied the formation of soapstone (magnesite-talc rock) and other magnesite-bearing assemblages during mineral carbonation of mantle peridotite in the St. Paul's transform fault, equatorial Atlantic. Clumped carbonate thermometry of soapstone yields a formation (or equilibration) temperature of 147 ± 13 °C which, based on thermodynamic constraints, suggests that CO_2(aq) concentrations of the hydrothermal fluid were at

SUBMITTER: Klein F 

PROVIDER: S-EPMC10895273 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature