Title :

Is There a Global Carbonate Layer in the Oceanic Mantle?

Author(s) :

Hammouda, Tahar [Auteur]
Manthilake, Geeth [Auteur]
Goncalves, Philippe [Auteur]
Chantel, Julien [Auteur]
Laboratoire Magmas et Volcans [LMV]
Case Western Reserve University [Cleveland]
Guignard, Jérémy [Auteur]
Crichton, Wilson [Auteur]
Gaillard, Fabrice [Auteur]

Journal title :

Geophysical Research Letters

Volume number :

48

Publisher :

American Geophysical Union

Publication date :

2020-12-19

English keyword(s) :

carbon cycle
lithosphere
subduction

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

English abstract : [en]

Previous modeling of carbonate subduction by high‐pressure experimentation has allowed to propose scenarios for bulk carbon return to the mantle, but the detailed transfer mechanisms have seldom been studied. We monitored ...
Show more >Previous modeling of carbonate subduction by high‐pressure experimentation has allowed to propose scenarios for bulk carbon return to the mantle, but the detailed transfer mechanisms have seldom been studied. We monitored carbonate–silicate reactions by combining high‐pressure experiments and synchrotron‐based X‐ray diffraction. Carbonates break down at moderate pressure and high temperature and CO2 is trapped at grain boundaries. Further isothermal compression yields melting, which may control continuous carbon introduction, first in the mantle wedge, and next, away from the wedge. Carbon presence has been discussed in a variety of magmatic contexts, under the oceanic lithosphere (hotspots, petit spots, and fossil ridges). We suggest the presence of a global carbon‐rich layer under the oceanic lithosphere that is steadily fed by subduction processes. This layer can be the source of mechanical weakening of the lithosphere–asthenosphere boundary under the oceans. Therefore, carbon‐induced compression melting may be a key mechanism of modern‐style plate tectonics.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

Electrical Petrology: tracking mantle melting and volatiles cycling using electrical conductivity

ANR Project :

Clermont-Ferrand centre for research on volcanism
CAP 20-25

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2021-01-21T10:42:00Z
2021-01-25T11:16:28Z