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Dislocation microstructures in simple-shear-deformed wadsleyite at transition-zone conditions : Weak-beam dark-field TEM characterization of dislocations on the (010) plane
Title data
Miyajima, Nobuyoshi ; Kawazoe, Takaaki:
Dislocation microstructures in simple-shear-deformed wadsleyite at transition-zone conditions : Weak-beam dark-field TEM characterization of dislocations on the (010) plane.
In: American Mineralogist.
Vol. 100
(2015)
Issue 11-12
.
- pp. 2749-2752.
ISSN 1945-3027
Abstract in another language
Dislocation microstructures of an (010)[001]-textured wadsleyite have been investigated in weak-beam dark-field imaging in a transmission electron microscope. 1/2 < 101 > partial dislocations on the (010) plane are characterized with [100] dislocations on the (001) plane and 1/2 < 111 > dislocations forming {011} slip bands. The partial dislocations are extended on the (010) stacking fault as a glide configuration (i.e., Shockley-type stacking faults with 1/2 < 101 > displacement vector). The [001] slip on the (010) plane occurs by glide of the dissociated dislocations, which can play an important role in the generation of the crystallographic preferred-orientation patterns reported in water-poor deformation conditions. The glide mechanism on the (010) plane leaves the oxygen sub-lattice unaffected, but changes the cation distribution, forming a defective stacking sequence of the magnesium cations in the process of dislocation gliding. The mechanism might be related to transformation plasticity and related effects, such as transformation-enhanced weakening and deep-focus earthquakes in the mantle transition zone.
Further data
| Item Type: |
Article in a journal
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| Refereed: |
Yes |
| Keywords: |
wadsleyite; slip systems; slip plane; burgers vector; shockley-type extended dislocation; frank's rule; chalmers-martius criterion; high-pressure deformation; plastic-deformation; seismic anisotropy; phase-transformation; burgers vector; slip systems; upper-mantle; (mg,fe)2sio4; ringwoodite; minerals
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| Institutions of the University: |
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Structure and Dynamics of Earth Materials > Chair Structure and Dynamics of Earth Materials - Univ.-Prof. Dr. Tomoo Katsura
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Experimental Geosciences > Chair Experimental Geosciences - Univ.-Prof. Dr. Daniel Frost
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Experimental Geophysics of the Solid Earth
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Experimental Geophysics of the Solid Earth > Chair Experimental Geophysics of the Solid Earth - Univ.-Prof. Dr. Hans Keppler
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Structure and Dynamics of Earth Materials
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Experimental Geosciences |
| Result of work at the UBT: |
Yes |
| DDC Subjects: |
500 Science > 550 Earth sciences, geology |
| Date Deposited: |
14 Jul 2017 10:12 |
| Last Modified: |
14 Jul 2017 10:12 |
| URI: |
https://eref.uni-bayreuth.de/id/eprint/38458 |
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