Title :

Methane-hydrogen-rich fluid migration may trigger seismic failure in subduction zones at forearc depths

Author(s) :

Giuntoli, Francesco [Auteur]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Menegon, Luca [Auteur]
Oslo Metropolitan University [OsloMet]
Siron, Guillaume [Auteur]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Cognigni, Flavio [Auteur]
Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] [UNIROMA]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Compagnoni, Roberto [Auteur]
Università degli studi di Torino = University of Turin [UNITO]
Rossi, Marco [Auteur]
Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] [UNIROMA]
Vitale Brovarone, Alberto [Auteur]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Institut de minéralogie, de physique des matériaux et de cosmochimie [IMPMC]

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

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre

English abstract : [en]

Metamorphic 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 ...
Show more >Metamorphic 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

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2024-02-07T13:36:52Z
2024-02-08T08:04:07Z