Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

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
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
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 > Lehrstuhl für Struktur und Dynamik der Erdmaterie - Univ.-Prof. Dr. Tomoo Katsura
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Experimental Geosciences > Lehrstuhl für Experimentelle Geowissenschaften - Univ.-Prof. Dr. Daniel Frost
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Lehrstuhl für Experimentelle Geophysik
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Lehrstuhl für Experimentelle Geophysik > Lehrstuhl für Experimentelle Geophysik - 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