Shear deformation experiments of forsterite at 11 GPa - 1400C in the multianvil apparatus

Couvy, H.; Frost, Daniel J.; Heidelbach, Florian; Nyilas, K.; Ungár, Tamás; Mackwell, S. J.; Cordier, Patrick

doi:10.1127/0935-1221/2004/0016-0877

Cited by 149 publications

(115 citation statements)

References 52 publications

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“…[13][14][15]). This hypothesis is supported by microstructural observations which always show that [001] glide is dominated by long straight screw dislocations (for instance [16,2,6]), implying that these dislocations experience large lattice friction stresses.…”

Section: Introductionmentioning

confidence: 68%

“…No other slip systems are observed despite the fact that, according to the von Mises criterion [5], there are not enough active slip systems to permit polycrystalline deformation. Recent studies have shown that [001] glide is enhanced when pressure increases [6][7][8][9][10] or when trace amounts of water are incorporated into the olivine crystal structure [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite

Carrez

Walker

Metsue

et al. 2008

Philosophical Magazine

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite

Carrez

Walker

Metsue

et al. 2008

Philosophical Magazine

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“…While the dependence of olivine fabric on stress, temperature, and water content has been fairly well established, its possible dependence on pressure has been a topic of some debate. A few studies have claimed experimental support for a pressure-induced fabric transition in olivine, including Couvy et al (2004), Mainprice et al (2005), and Raterron et al (2007). However, it has been debated whether the observed transitions were in fact due to pressure or if they were influenced by other factors, such as stress or water content .…”

Section: The Upper Mantlementioning

confidence: 99%

Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions

2009

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Measurements of the splitting or birefringence of seismic shear waves that have passed through the Earth's mantle yield constraints on the strength and geometry of elastic anisotropy in various regions, including the upper mantle, the transition zone, and the D 00 layer. In turn, information about the occurrence and character of seismic anisotropy allows us to make inferences about the style and geometry of mantle flow because anisotropy is a direct consequence of deformational processes. While shear wave splitting is an unambiguous indicator of anisotropy, the fact that it is typically a near-vertical path-integrated measurement means that splitting measurements generally lack depth resolution. Because shear wave splitting yields some of the most direct constraints we have on mantle flow, however, understanding how to make and interpret splitting measurements correctly and how to relate them properly to mantle flow is of paramount importance to the study of mantle dynamics. In this paper, we review the state of the art and recent developments in the measurement and interpretation of shear wave splitting-including new measurement methodologies and forward and inverse modeling techniques,-provide an overview of data sets from different tectonic settings, show how they help us relate mantle flow to surface tectonics, and discuss new directions that should help to advance the shear wave splitting field.

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“…that there is no significant differences between the mechanisms responsible for deformations in the laboratory and along mantle geotherms. This assumption in not verified for mantle aggregates deforming in the dislocation creep regime, since olivine and clinopyroxenes (CPx) exhibit marked transitions induced by pressure in their dominant dislocation slip systems (Couvy et al, 2004;Raterron et al, 2007Raterron et al, , 2011Raterron et al, , 2012Amiguet et al, 2009;Jung et al, 2009;Ohuchi et al, 2011;). Besides, olivine and pyroxenes slip systems exhibit different stress sensitivities (e.g., Bai et al, 1991;Raterron and Jaoul, 1991) which cannot be accounted for by a single n exponent in the rheological law.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation

Raterron

Detrez

Castelnau

et al. 2014

Physics of the Earth and Planetary Interiors

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. We report a first application of an improved second-order (SO) viscoplastic self-consistent model for multiphase aggregates, applied to an olivine + diopside aggregate as analogue for a dry upper mantle peridotite deformed at 10 À15 s À1 shear strain rate along a 20-Ma ocean geotherm. Beside known dislocation slip systems, this SO-model version accounts for an isotropic relaxation mechanism representing 'diffusionrelated' creep mechanisms in olivine. Slip-system critical resolved shear stress (CRSS) are evaluated in both phases -as functions of P, T, oxygen fugacity (fO 2 ) and strain rate -from previously reported experimental data obtained on single crystals and first-principle calculations coupled with the Peierls-Nabarro model for crystal plasticity; and the isotropic-mechanism dependence on T and P matches that of Si selfdiffusion in olivine, while its relative activity is constrained by reported data. The model reproduces well the olivine and diopside lattice preferred orientations (LPO) produced experimentally and observed in naturally deformed rocks, as well as observed sensitivities of multiphase aggregate strength to the volume fraction of the hard phase (here diopside). It shows a significant weakening of olivine LPO with increasing depth, which results from the combined effects of the P-induced

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Shear deformation experiments of forsterite at 11 GPa - 1400C in the multianvil apparatus

Cited by 149 publications

References 52 publications

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite

Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions

Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation

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Shear deformation experiments of forsterite at 11 GPa - 1400C in the multianvil apparatus

Cited by 149 publications

References 52 publications

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg2SiO4forsterite

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg2SiO4forsterite

Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions

Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation

Contact Info

Product

Resources

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Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite

Evidence from numerical modelling for 3D spreading of [001] screw dislocations in Mg₂SiO₄forsterite