Experimental deformation of diopside and websterite

AvéLallemant, Hans G.

doi:10.1016/0040-1951(78)90083-5

Cited by 145 publications

(57 citation statements)

References 20 publications

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“…The plasticity of CPx single crystals has been the topic of a number of experimental studies (Avé Lallemant, 1978;Blacic, 1982, 1983;Ingrin et al, 1991Ingrin et al, , 1992Raterron and Jaoul, 1991;Jaoul and Raterron, 1994;Raterron et al, 1994;Amiguet et al, 2009Amiguet et al, , 2010 To evaluate the CRSS of diopside slip systems, we use the experimental data reported for crystals free of the so-called early-partialmelting (EPM) precipitates (Doukhan et al, 1993), since no EPM precipitation occurs at high pressure in diopside (Raterron et al, 1995). We use the rheological data from Raterron and Jaoul (1991), Jaoul and Raterron (1994), Raterron et al (1994), and Amiguet et al (2009 Table 2), which allow characterizing the activity of diopside known dislocation slip systems.…”

Section: Diopside Slip-system Crssmentioning

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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Section: Diopside Slip-system Crssmentioning

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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“…Insights into deformation mechanisms, slip systems, and flow-law parameters have been obtained from experimental studies, e.g., for plagioclase: Tullis and Yund (1985), Shaocheng and Mainprice (1987), Tullis and Yund (1991), Dimanov et al (1999), Rybacki and Dresen (2000), Stünitz and Tullis (2001), Stünitz et al (2003), Ji et al (2004), and Barreiro et al (2007); for pyroxene: Lallemant (1978), Kolle and Blacic (1982), Raterron and Jaoul (1991), Mauler et al (2000), Bystricky and Mackwell (2001), HierMajumder et al (2005), Chen et al (2006), and Zhang et al (2006).…”

Section: Introductionmentioning

confidence: 99%

Syn-kinematic hydration reactions, grain size reduction, and dissolution–precipitation creep in experimentally deformed plagioclase–pyroxene mixtures

et al. 2018

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Abstract. It is widely observed that mafic rocks are able to accommodate high strains by viscous flow. Yet, a number of questions concerning the exact nature of the involved deformation mechanisms continue to be debated. In this contribution, rock deformation experiments on four different water-added plagioclase-pyroxene mixtures are presented: (i) plagioclase(An60-70)-clinopyroxene-orthopyroxene, (ii) plagioclase(An60)-diopside, (iii) plagioclase(An60)-enstatite, and (iv) plagioclase(An01)-enstatite. Samples were deformed in general shear at strain rates of 3 × 10 −5 to 3 × 10 −6 s −1 , 800 • C, and confining pressure of 1.0 or 1.5 GPa. Results indicate that dissolution-precipitation creep (DPC) and grain boundary sliding (GBS) are the dominant deformation mechanisms and operate simultaneously. Coinciding with sample deformation, syn-kinematic mineral reactions yield abundant nucleation of new grains; the resulting intense grain size reduction is considered crucial for the activity of DPC and GBS. In high strain zones dominated by plagioclase, a weak, nonrandom, and geometrically consistent crystallographic preferred orientation (CPO) is observed. Usually, a CPO is considered a consequence of dislocation creep, but the experiments presented here demonstrate that a CPO can develop during DPC and GBS. This study provides new evidence for the importance of DPC and GBS in mid-crustal shear zones within mafic rocks, which has important implications for understanding and modeling mid-crustal rheology and flow.

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“…Below 800 C and high stress/strain rate mechanical twinning on planes (100) and (001) dominates (e.g. Av e Lallemant, 1978). At higher temperatures dislocation and diffusion creep control the deformation, depending on microstructure and stresses (e.g.…”

Section: Tablementioning

confidence: 99%

“…While (100) [001] and (010) [001] have been suggested as important slip system for high-grade metamorphic conditions (Av e Lallemant, 1978;Ross and Nielsen, 1978;Christensen and Lundquist, 1982;Dornbusch et al, 1994), the contribution of other mechanisms like grain boundary sliding could results in different textures (e.g. Sundberg and Cooper, 2008).…”

Section: Tablementioning

confidence: 99%

Texture and elastic anisotropy of a mylonitic anorthosite from the Morin Shear Zone (Quebec, Canada)

Barreiro

Wenk

Vogel

2015

Journal of Structural Geology

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a b s t r a c tA sample of anorthosite from the granulite facies Morin Shear Zone (Quebec, Canada) was investigated for crystal preferred orientation and elastic anisotropy. Time-of-flight neutron diffraction data obtained with the HIPPO diffractometer at LANSCE were analyzed with the Rietveld method to obtain orientation distribution functions of the principal phases (plagioclase, clinopyroxene and orthopyroxene). Texture and microstructures are compatible with the plastic deformation of the aggregate under high-T conditions. All mineral phases depict a significant preferred orientation that could be related to the general top-to-the north shearing history of the Morin Shear Zone. Texture patterns suggest that (010)[001] in plagioclase and (110)[001] in clinopyroxene are likely dominant slip systems. Using preferred orientation data P-and S-waves velocities and elastic anisotropy were calculated and compared with previous studies to explore elastic properties of rocks with different pyroxene-plagioclase mixtures. P-wave velocity, S-wave splitting and anisotropy increase with clinopyroxene content. Seismic anisotropy is linked to the texture symmetry which can lead to large deviations between actual anisotropy and that measured along Cartesian XYZ sample directions (lineation/foliation reference frame). This is significant for the prediction and interpretation of seismic data, particularly for monoclinic or triclinic texture symmetries.

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Experimental deformation of diopside and websterite

Cited by 145 publications

References 20 publications

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

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

Syn-kinematic hydration reactions, grain size reduction, and dissolution–precipitation creep in experimentally deformed plagioclase–pyroxene mixtures

Texture and elastic anisotropy of a mylonitic anorthosite from the Morin Shear Zone (Quebec, Canada)

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