Is There a Global Carbonate Layer in the ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Permalink :
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]
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
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
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 >
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 :
ANR Project :
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2021-01-21T10:42:00Z
2021-01-25T11:16:28Z
2021-01-25T11:16:28Z