Room temperature microplasticity of a spodumene LiAlSi2O6

Van-Duysen, Jean Claude; Doukhan, Jean-Claude

doi:10.1007/bf00309647

Cited by 16 publications

(3 citation statements)

References 11 publications

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“…They suggested that the dislocation glide (or slip) may operate at relatively low temperatures as the Na occupying the M4 site is able to jump into the neighboring empty A-site in glaucophane [21]. As the easiest slip systems in chain-silicate structures tend to avoid breaking the Si-O bond [41,42], they concluded that the dislocation glide needs to operate between the Si-O tetrahedral chains; this means the (010) in In epidote deformed under a shear strain between 2 < γ < 4 (γ = 2.4, JH98a), WBDF images illustrated the presence of several twin boundaries as well as subgrain boundaries aligned parallel or perpendicular to the shear direction (yellow arrow; Figure 8a,b). The BF image of epidote deformed under a high shear strain of γ = 4.5 (JH94a) showed the presence of many distorted lattice structures with brittle failures, similar in texture to glaucophane deformed with a high shear strain (Figure 8c).…”

Section: Lpo Formation and Deformation Mechanisms Of Glaucophanementioning

confidence: 99%

Section: Lpo Formation and Deformation Mechanisms Of Glaucophanementioning

confidence: 99%

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Lattice Preferred Orientation and Deformation Microstructures of Glaucophane and Epidote in Experimentally Deformed Epidote Blueschist at High Pressure

Park

Jung

2020

Minerals

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To understand the lattice preferred orientation (LPO) and deformation microstructures at the top of a subducting slab in a warm subduction zone, deformation experiments of epidote blueschist were conducted in simple shear under high pressure (0.9–1.5 GPa) and temperature (400–500 °C). At low shear strain (γ ≤ 1), the [001] axes of glaucophane were in subparallel alignment with the shear direction, and the (010) poles were subnormally aligned with the shear plane. At high shear strain (γ > 2), the [001] axes of glaucophane were in subparallel alignment with the shear direction, and the [100] axes were subnormally aligned with the shear plane. At a shear strain between 2< γ <4, the (010) poles of epidote were in subparallel alignment with the shear direction, and the [100] axes were subnormally aligned with the shear plane. At a shear strain where γ > 4, the alignment of the (010) epidote poles had altered from subparallel to subnormal to the shear plane, while the [001] axes were in subparallel alignment with the shear direction. The experimental results indicate that the magnitude of shear strain and rheological contrast between component minerals plays an important role in the formation of LPOs for glaucophane and epidote.

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Section: Lpo Formation and Deformation Mechanisms Of Glaucophanementioning

confidence: 99%

Section: Lpo Formation and Deformation Mechanisms Of Glaucophanementioning

confidence: 99%

Lattice Preferred Orientation and Deformation Microstructures of Glaucophane and Epidote in Experimentally Deformed Epidote Blueschist at High Pressure

Park

Jung

2020

Minerals

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“…The possible origin of an intrinsic lattice friction in pyroxene structures has already been discussed. It has been suggested that it stems from the impingement of the oxygen anions on both sides of the glide plane [Raleigh et al, 1971;Van Duysen and Doukhan, 1984;Doukhan et al, 1986]. This lattice friction would depend on the exact positions of the various oxygen anions in both planes (i.e., on the precise chemical composition of the pyroxene considered and on temperature, through thermal expansion of the structure).…”

Section: Deformation Mechanismsmentioning

confidence: 99%

High‐temperature deformation of diopside single crystal: 2. Transmission electron microscopy investigation of the defect microstructures

Ingrin¹,

Doukhan²,

Doukhan³

1991

J. Geophys. Res.

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The defect microstructures induced by high‐temperature creep in diopside single crystals are reported, based upon investigation by transmission electron microscopy (TEM). The creep experiments as well as the steady state creep laws are reported in a companion paper (Raterron and Jaoul, this issue); they clearly show that two deformation regimes occur, one at temperatures above a critical temperature Tc of 1130°–1140°C and one at temperatures below Tc. At high temperature, diopside is stronger than would be expected by extrapolation of the creep law at lower temperature. TEM observations indicate that the same glide systems {110}1/2〈110〉 are activated above and below this critical temperature; in both cases, evidence for dislocation climb has not been detected. The only noticeable difference between the two deformation regimes is the occurrence in the samples deformed in the higher temperature range of a large and homogeneous density of tiny precipitates of a glassy phase; these precipitates interact with the mobile dislocations. The size and the density of the precipitates increase dramatically with temperature. Just below 1130°–1140°C, a very limited and heterogeneous precipitation seems to occur along the dislocation cores in the form of very tiny precipitates less than 10 nm size. At 1250°C the precipitates reach 0.1 μm diameter. It is suggested that pinning of mobile dislocations by these precipitates is responsible for the hardening effect observed above 1130°–1140°C. Although the volume proportion of glass may be extremely low, its occurrence clearly means that partial melting occurs at temperatures well below the widely accepted melting temperature of this clinopyroxene (1350°C at 1 atm). Such a phenomenon which can be detected directly only by TEM (and indirectly by its consequences on the mechanical properties of the material) might also occur in a number of other silicate minerals.

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Microstructural defects in experimentally shocked diopside: A TEM characterization

Leroux¹,

Doukhan²,

Langenhorst

1994

Phys Chem Minerals

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Room temperature microplasticity of a spodumene LiAlSi2O6

Cited by 16 publications

References 11 publications

Lattice Preferred Orientation and Deformation Microstructures of Glaucophane and Epidote in Experimentally Deformed Epidote Blueschist at High Pressure

Lattice Preferred Orientation and Deformation Microstructures of Glaucophane and Epidote in Experimentally Deformed Epidote Blueschist at High Pressure

High‐temperature deformation of diopside single crystal: 2. Transmission electron microscopy investigation of the defect microstructures

Microstructural defects in experimentally shocked diopside: A TEM characterization

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