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<p>&bull;This study reports widespread mineral carbonation of mantle rocks in an oceanic transform fueled by magmatic degassing of CO₂.&nbsp;</p> <p>&bull;The findings describe a previously unknown part of the geological carbon cycle in transform faults that represent one of the three principal plate boundaries on Earth.&nbsp;</p> <p>&bull;The confluence of tectonically exhumed mantle rocks and CO₂-rich alkaline basalt formed through limited extents of melting characteristic of the St. Paul&rsquo;s transform faults may be a pervasive feature at oceanic transform faults in general. Because transform faults have not been accounted for in previous estimates of global geological CO₂ fluxes, the mass transfer of magmatic CO₂ to the altered oceanic mantle and seawater may be larger than previously thought.&nbsp;</p> <p>&bull;

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