Record number :
2306453
Title of article :
Texture development and deformation mechanisms in ringwoodite
Author/Authors :
Wenk، نويسنده , , H.-R. and Ischia، نويسنده , , G. and Nishiyama، نويسنده , , N. and Wang، نويسنده , , Y. and Uchida، نويسنده , , T.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
9
From page :
191
To page :
199
Abstract :
Ringwoodite Mg2SiO4 with spinel structure is an important phase in the earthʹs mantle transition zone. Controlled deformation experiments showed that ringwoodite underwent ductile deformation when compressed axially at 6–10 GPa and at room temperature in a multianvil D-DIA deformation apparatus. Texture evolution during cyclic compression has been recorded in situ using X-ray transparent anvils with monochromatic synchrotron X-ray diffraction and a two-dimensional detector. Quantitative analysis of the images with the Rietveld method revealed a 1 1 0 fiber texture. By comparing this texture pattern with polycrystal plasticity simulations, it is inferred that {1 1 1}〈 1 ¯ 1 0〉 slip is the dominant deformation mechanism in ringwoodite, consistent with high temperature mechanisms observed in other spinel-structured materials. Although strong ringwoodite textures may develop in the transition zone, the contribution to bulk anisotropy is minimal due to the weak single-crystal anisotropy.
Keywords :
Deformation mechanisms , Texture , Transition zone , Synchrotron X-rays , Ringwoodite , Multianvil apparatus
Journal title :
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
Link To Document :