Decoupling of inorganic and organic carbon during slab mantle devolatilisation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nature Communications Année : 2022

Decoupling of inorganic and organic carbon during slab mantle devolatilisation

Résumé

Serpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providing key evidence for carbonate mobility during serpentinite devolatilisation. We show through the O, C, and Sr isotope analyses of vein minerals and the host serpentinites that about 90% of the meta-serpentinite inorganic carbon is remobilized during slab devolatilisation. In contrast, graphite-like carbonaceous compounds remain trapped within the host rock as inclusions within metamorphic olivine while the bulk elemental and isotope composition of organic carbon remains relatively unchanged during the subduction process. This shows a decoupling behavior of carbon during serpentinite dehydration in subduction zones. This process will therefore facilitate the transfer of inorganic carbon to the mantle wedge and the preferential slab sequestration of organic carbon en route to the deep mantle.
Fichier principal
Vignette du fichier
2022-Bouilhol-etal_NatComm.pdf (2.24 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03608688 , version 1 (15-03-2022)

Licence

Paternité

Identifiants

Citer

P. Bouilhol, B. Debret, E. Inglis, M. Warembourg, Thomas Grocolas, et al.. Decoupling of inorganic and organic carbon during slab mantle devolatilisation. Nature Communications, 2022, 13 (1), pp.308. ⟨10.1038/s41467-022-27970-0⟩. ⟨hal-03608688⟩
29 Consultations
25 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More