Patrick Cordier
YOU?
Author Swipe
View article: The origin of micro-porosity in quartz mylonites: insights from quartz-rich shear bands in the Ikaria granite
The origin of micro-porosity in quartz mylonites: insights from quartz-rich shear bands in the Ikaria granite Open
Micro-scale porosity is a feature commonly found in viscously deformed quartz-rich mylonites. However, the processes which may form such porosity are actively debated, and whether or not pores are formed syn-kinematically to shear zone act…
View article: On the effect of strain rates on the deformation creep mechanisms in deep Earth mantle
On the effect of strain rates on the deformation creep mechanisms in deep Earth mantle Open
The transport of heat from the interior of the Earth drives convection in the mantle, which involves the deformation of solid rocks over billions of years. Significant advancements have been made over recent years to study lower mantle ass…
View article: Extrinsic and intrinsic strength of amorphous olivine films
Extrinsic and intrinsic strength of amorphous olivine films Open
Nanoscale amorphous olivine (a-olivine) intracrystalline layers, which can form in olivine polycrystals under high stress, has the potential to influence the mechanical properties of the rock in the vicinity of the brittle–ductile transiti…
View article: Constraining the rheology of the lower mantle with the global trend in slab sinking
Constraining the rheology of the lower mantle with the global trend in slab sinking Open
The rheology of Earth’s lower mantle plays a crucial role in shaping mantle convection and consequently in planetary evolution but is still under debate1. Propositions differ on the rheology of ferropericlase, whether it is stronger2 or we…
View article: Room temperature electron beam sensitive viscoplastic response of ultra-ductile amorphous olivine films
Room temperature electron beam sensitive viscoplastic response of ultra-ductile amorphous olivine films Open
The mechanical properties of amorphous olivine (a-olivine) deformed at room temperature are investigated in situ in a TEM under uniaxial tension using a Push-to-Pull (PTP) device. Thin films of a-olivine were produced by pulsed laser depos…
View article: Evidence of Dislocation Mixed Climb in Quartz From the Main Central and Moine Thrusts: An Electron Tomography Study
Evidence of Dislocation Mixed Climb in Quartz From the Main Central and Moine Thrusts: An Electron Tomography Study Open
In this study we apply electron tomography to characterize 3D dislocation microstructures in two quartz mylonite specimens from the Moine and Main Central Thrusts, both of which accommodated displacements by dislocation creep in the presen…
View article: Atomistic to continuum mechanics description of crystal defects with dislocation density fields: Application to dislocations and grain boundaries
Atomistic to continuum mechanics description of crystal defects with dislocation density fields: Application to dislocations and grain boundaries Open
International audience
View article: Evidence of Dislocation Mixed Climb in Quartz from the Moine and Main Central Thrusts: an Electron Tomography Study
Evidence of Dislocation Mixed Climb in Quartz from the Moine and Main Central Thrusts: an Electron Tomography Study Open
In this study we apply electron tomography to characterize 3D dislocation microstructures in two highly sheared quartz mylonite specimens from the Moine and Main Central thrusts which were deformed extensively by dislocation creep in the p…
View article: On Dislocation Climb as an Important Deformation Mechanism for Planetary Interiors
On Dislocation Climb as an Important Deformation Mechanism for Planetary Interiors Open
An understanding of the rheological behavior of the solid Earth is fundamental to provide a quantitative description of most geological and geophysical phenomena. The continuum mechanics approach to describing large-scale phenomena needs t…
View article: On-chip very low strain rate rheology of amorphous olivine films
On-chip very low strain rate rheology of amorphous olivine films Open
Recent observations made by the authors revealed the activation of stress induced amorphization and sliding at grain boundary in olivine [1], a mechanism which is expected to play a pivotal role in the viscosity drop at the lithosphere-ast…
View article: From electron tomography of dislocations to field dislocation mechanics: application to olivine
From electron tomography of dislocations to field dislocation mechanics: application to olivine Open
We propose a new procedure to extract information from electron tomography and use them as an input in a field dislocation mechanics. Dislocation electron tomography is an experimental technique that provides three-dimensional (3D) informa…
View article: Rheological properties of Mg2SiO4 glass: A molecular dynamics study
Rheological properties of Mg2SiO4 glass: A molecular dynamics study Open
International audience
View article: From Electron Tomography of Dislocations to Field Dislocation Mechanics: application to olivine
From Electron Tomography of Dislocations to Field Dislocation Mechanics: application to olivine Open
Aligned and numerically filtered tilt-series of the PoEM9 specimen (double-tilt sample-holder + weak-beam dark-field conditions + precession angle = 0.1°+ objective aperture = 20 micron): Tilted-series 1: Projection angles from -48° to 52°…
View article: From Electron Tomography of Dislocations to Field Dislocation Mechanics: application to olivine
From Electron Tomography of Dislocations to Field Dislocation Mechanics: application to olivine Open
Aligned and numerically filtered tilt-series of the PoEM9 specimen (double-tilt sample-holder + weak-beam dark-field conditions + precession angle = 0.1°+ objective aperture = 20 micron): Tilted-series 1: Projection angles from -48° to 52°…
View article: Dislocation and disclination densities in experimentally deformed polycrystalline olivine
Dislocation and disclination densities in experimentally deformed polycrystalline olivine Open
We report a comprehensive data set characterizing and quantifying the geometrically necessary dislocation (GND) density in the crystallographic frame (ραc) and disclination density (ρθ) in fine-grained polycrystalline olivine deformed in u…
View article: Periclase deforms more slowly than bridgmanite under mantle conditions
Periclase deforms more slowly than bridgmanite under mantle conditions Open
Transport of heat from the interior of the Earth drives convection in the mantle, which involves the deformation of solid rocks over billions of years. The lower mantle of the Earth is mostly composed of iron-bearing bridgmanite MgSiO 3 an…
View article: Dislocation and disclination densities in experimentally deformed polycrystalline olivine
Dislocation and disclination densities in experimentally deformed polycrystalline olivine Open
We report a comprehensive dataset characterizing and quantifying the dislocation density in the crystallographic frame (ρ_α^c) and disclination density (ρ_θ) in fine-grained polycrystalline olivine deformed in uniaxial compression or torsi…
View article: Why do compact grain boundary complexions prevail in rock-salt materials?
Why do compact grain boundary complexions prevail in rock-salt materials? Open
International audience
View article: Complexions and stoichiometry of the 60.8°//[100](011) symmetrical tilt grain boundary in Mg2SiO4 forsterite: A combined empirical potential and first-principles study
Complexions and stoichiometry of the 60.8°//[100](011) symmetrical tilt grain boundary in Mg2SiO4 forsterite: A combined empirical potential and first-principles study Open
In this work we explore the low-energy complexions of the symmetrical tilt grain boundary (GB) 60.8°//[100](011) in forsterite through molecular dynamics and first principles calculations. Using a conservative sampling, we find six stoichi…
View article: Influence of a yield stress on lower mantle dynamics: filtering and changing morphology of plumes and slabs
Influence of a yield stress on lower mantle dynamics: filtering and changing morphology of plumes and slabs Open
<div> <div> <div> <p>When a fluid can experience a "jammed" state, it will flow only when the local deviatoric stress becomes greater than a critical stress, the so-called &#160;"yield-stress"…