Methane-hydrogen-rich fluid migration may ...
Document type :
Article dans une revue scientifique: Article original
Permalink :
Title :
Methane-hydrogen-rich fluid migration may trigger seismic failure in subduction zones at forearc depths
Author(s) :
Giuntoli, Francesco [Auteur]
Menegon, Luca [Auteur]
Siron, Guillaume [Auteur]
Cognigni, Flavio [Auteur]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Compagnoni, Roberto [Auteur]
Rossi, Marco [Auteur]
Vitale Brovarone, Alberto [Auteur]
Menegon, Luca [Auteur]
Siron, Guillaume [Auteur]
Cognigni, Flavio [Auteur]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Compagnoni, Roberto [Auteur]
Rossi, Marco [Auteur]
Vitale Brovarone, Alberto [Auteur]
Journal title :
Nature communications
Abbreviated title :
Nat Commun
Volume number :
15
Publisher :
Springer Science and Business Media LLC
Publication date :
2024-01-11
ISSN :
2041-1723
English abstract : [en]
AbstractMetamorphic fluids, faults, and shear zones are carriers of carbon from the deep Earth to shallower reservoirs. Some of these fluids are reduced and transport energy sources, like H2 and light hydrocarbons. Mechanisms ...
Show more >AbstractMetamorphic fluids, faults, and shear zones are carriers of carbon from the deep Earth to shallower reservoirs. Some of these fluids are reduced and transport energy sources, like H2 and light hydrocarbons. Mechanisms and pathways capable of transporting these deep energy sources towards shallower reservoirs remain unidentified. Here we present geological evidence of failure of mechanically strong rocks due to the accumulation of CH4-H2-rich fluids at deep forearc depths, which ultimately reached supralithostatic pore fluid pressure. These fluids originated from adjacent reduction of carbonates by H2-rich fluids during serpentinization at eclogite-to-blueschist-facies conditions. Thermodynamic modeling predicts that the production and accumulation of CH4-H2-rich aqueous fluids can produce fluid overpressure more easily than carbon-poor and CO2-rich aqueous fluids. This study provides evidence for the migration of deep Earth energy sources along tectonic discontinuities, and suggests causal relationships with brittle failure of hard rock types that may trigger seismic activity at forearc depths.Show less >
Show more >AbstractMetamorphic fluids, faults, and shear zones are carriers of carbon from the deep Earth to shallower reservoirs. Some of these fluids are reduced and transport energy sources, like H2 and light hydrocarbons. Mechanisms and pathways capable of transporting these deep energy sources towards shallower reservoirs remain unidentified. Here we present geological evidence of failure of mechanically strong rocks due to the accumulation of CH4-H2-rich fluids at deep forearc depths, which ultimately reached supralithostatic pore fluid pressure. These fluids originated from adjacent reduction of carbonates by H2-rich fluids during serpentinization at eclogite-to-blueschist-facies conditions. Thermodynamic modeling predicts that the production and accumulation of CH4-H2-rich aqueous fluids can produce fluid overpressure more easily than carbon-poor and CO2-rich aqueous fluids. This study provides evidence for the migration of deep Earth energy sources along tectonic discontinuities, and suggests causal relationships with brittle failure of hard rock types that may trigger seismic activity at forearc depths.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2024-02-07T13:36:52Z