Effect of lattice preferred orientation on lattice strains in polycrystalline materials deformed under high pressure: Application to hcp-Co

2006 ◽  
Vol 67 (9-10) ◽  
pp. 2119-2131 ◽  
Author(s):  
Sébastien Merkel ◽  
Takehiko Yagi
Keyword(s):  
High Pressure ◽  
Preferred Orientation ◽  
Polycrystalline Materials ◽  
Lattice Strains ◽  
Pressure Application ◽  
Lattice Preferred Orientation

New lattice preferred orientation(LPO) of amphibole experimentally found in simple shear

2020 ◽  
Author(s):  
Junha Kim ◽  
Haemyeong Jung
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
Shear Strain ◽  
Seismic Anisotropy ◽  
Preferred Orientation ◽  
Shear Direction ◽  
High Shear ◽  
Type Iv ◽  
Lower Shear ◽  
Lattice Preferred Orientation

<p>The lattice preferred orientation(LPO) of amphibole has a large effect on seismic anisotropy in the crust. Previous studies have reported four LPO types (I–IV) of amphibole, but the genesis of type IV LPO, which is characterized by [100] axes aligned in a girdle subnormal to the shear direction, is unknown. In this study, shear deformation experiments on amphibolite were conducted to find the genesis of type IV LPO at high pressure (0.5 GPa) and temperature (500–700 °C). The type IV LPO was found under high shear strain (γ > 3.0) and the sample exhibited grains in a range of sizes but generally smaller than the grain size of samples with lower shear strain. The seismic anisotropy of type IV LPO is lower than in types I-III. The weak seismic anisotropy of highly deformed amphibole could explain weak seismic anisotropy observed in the middle crust.</p>

Lattice preferred orientation and stress in polycrystalline hcp-Co plastically deformed under high pressure

2006 ◽  
Vol 100 (2) ◽  
pp. 023510 ◽  
Author(s):  
Sébastien Merkel ◽  
Nobuyoshi Miyajima ◽  
Daniele Antonangeli ◽  
Guillaume Fiquet ◽  
Takehiko Yagi
Keyword(s):  
High Pressure ◽  
Preferred Orientation ◽  
Lattice Preferred Orientation

Lattice preferred orientation of talc and implications for seismic anisotropy

2020 ◽  
Author(s):  
Jungjin Lee ◽  
Haemyeong Jung ◽  
Reiner Klemd ◽  
Matthew Tarling ◽  
Dmitry Konopelko
Keyword(s):  
High Pressure ◽  
Subduction Zones ◽  
Seismic Anisotropy ◽  
Preferred Orientation ◽  
Azimuthal Anisotropy ◽  
Hydrous Minerals ◽  
Ultra High Pressure ◽  
Lattice Preferred Orientation ◽  
Radial Anisotropy ◽  
First Time

<p>Strong seismic anisotropy is generally observed in subduction zones. Lattice preferred orientation (LPO) of olivine and elastically anisotropic hydrous minerals has been considered to be an important factor causing anomalous seismic anisotropy. For the first time, we report on measured LPOs of polycrystalline talc. The study comprises subduction-related ultra-high-pressure metamorphic schists from the Makbal Complex in Kyrgyzstan-Kazakhstan and amphibolite-facies metasomatic schists from the Valla Field Block in Unst, Scotland. The here studied talc revealed a strong alignment of [001] axes (sub)normal to the foliation and a girdle distribution of [100] axes and (010) poles (sub)parallel to the foliation. The LPOs of polycrystalline talc produced a significant P–wave anisotropy (AVp = 72%) and a high S–wave anisotropy (AVs = 24%). The results imply that the LPO of talc influence both the strong trench-parallel azimuthal anisotropy and positive/negative radial anisotropy of P–waves, and the trench-parallel seismic anisotropy of S–waves in subduction zones.</p>

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

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 803
Author(s):  
Yong Park ◽  
Sejin Jung ◽  
Haemyeong Jung
Keyword(s):  
High Pressure ◽  
Shear Strain ◽  
Shear Plane ◽  
Preferred Orientation ◽  
Shear Direction ◽  
High Shear ◽  
Lattice Preferred Orientation ◽  
Subducting Slab ◽  
Zone Deformation ◽  
Low Shear

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.

Titanohematite lattice-preferred orientation and magnetic anisotropy in high-temperature mylonites

2002 ◽  
Vol 198 (1-2) ◽  
pp. 77-92 ◽  
Author(s):  
Jérôme Bascou ◽  
M.Irene B. Raposo ◽  
Alain Vauchez ◽  
Marcos Egydio-Silva
Keyword(s):  
High Temperature ◽  
Magnetic Anisotropy ◽  
Preferred Orientation ◽  
Lattice Preferred Orientation

Lattice preferred orientation in CaIrO3 perovskite and post-perovskite formed by plastic deformation under pressure

2007 ◽  
Vol 34 (9) ◽  
pp. 679-686 ◽  
Author(s):  
Ken Niwa ◽  
Takehiko Yagi ◽  
Kenya Ohgushi ◽  
Sébastien Merkel ◽  
Nobuyoshi Miyajima ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Preferred Orientation ◽  
Lattice Preferred Orientation

Modified Soxhlet extractor for high pressure application

1975 ◽  
Vol 46 (6) ◽  
pp. 680-681 ◽  
Author(s):  
J. E. Cuddeback ◽  
W. R. Burg
Keyword(s):  
High Pressure ◽  
Soxhlet Extractor ◽  
Pressure Application
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