Reply to ‘Discussion of oxygen isotopes in ophicalcites: an ever‐lasting controversy?’ by R. Coltat, Ph. Boulvais, Y. Branquet, M. Poujol, P. Gautier and G. Manatschal

Carbonation of mantle rocks during mantle exhumation is reported in present-day oceanic settings, both at mid-ocean ridges and ocean-continent transitions (OCTs). However, the hydrothermal conditions of carbonation (i.e., fluid sources, thermal regimes) during mantle exhumation remain poorly constrained. We focus on an exceptionally well-preserved fossil OCT where mantle rocks have been exhumed and carbonated along a detachment fault from underneath the continent to the seafloor along a tectonic Moho. Stable isotope (oxygen and carbon) analyses on calcite indicate that carbonation resulted from the mixing between serpentinization-derived fluids at ~175 °C and seawater. Strontium isotope compositions suggest interactions between seawater and the continental crust prior to carbonation. This shows that carbonation along the tectonic Moho occurs below the continental crust and prior to mantle exhumation at the seafloor during continental breakup.

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Moho carbonation at an ocean-continent transition

Coltat

Boulvais

Branquet

et al. 2021

Geology

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Reply to ‘Discussion of oxygen isotopes in ophicalcites: an ever‐lasting controversy?’ by R. Coltat, Ph. Boulvais, Y. Branquet, M. Poujol, P. Gautier and G. Manatschal

Cited by 1 publication

References 12 publications

Moho carbonation at an ocean-continent transition

Moho carbonation at an ocean-continent transition

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