Protracted fabric evolution in olivine: Implications for the   relationship among strain, crystallographic fabric, and seismic   anisotropy

doi:10.1016/j.epsl.2013.11.009

CORC > 北京大学 > 地球与空间科学学院

	Protracted fabric evolution in olivine: Implications for the relationship among strain, crystallographic fabric, and seismic anisotropy
	Hansen, Lars N. ; Zhao, Yong-Hong ; Zimmerman, Mark E. ; Kohlstedt, David L.
刊名	earth and planetary science letters
	2014
关键词	crystallographic-preferred orientation electron-backscatter diffraction experimental rock deformation upper-mantle seismic anisotropy grain-boundary sliding torsion LATTICE-PREFERRED ORIENTATION HIGH-TEMPERATURE CREEP OCEANIC UPPER-MANTLE SINGLE-CRYSTALS SIMPLE SHEAR MISORIENTATION ANALYSIS DEFORMED PERIDOTITES ELASTIC-CONSTANTS OMAN OPHIOLITE SKS-WAVES
DOI	10.1016/j.epsl.2013.11.009
英文摘要	Crystallographic fabrics in olivine-rich rocks provide critical information on conditions and mechanisms of deformation as well as seismic properties of Earth's upper mantle. Previous interpretations of fabrics produced in laboratory experiments were complicated by uncertainty as to whether the steady-state fabric was attained. To examine the systematics of the evolution of olivine crystallographic fabrics at high strain, we conducted torsion experiments on olivine aggregates to shear strains of up to similar to 20. Our results demonstrate that a steady-state fabric is not reached until a shear strain >10, a much higher value than previously thought necessary. Fabrics characterized by girdles of [010] and [001] axes or by clusters of [010] and [001] axes are both observed. Until now, these fabrics were associated with either two different deformation mechanisms or two different sets of deformation conditions. Here we establish that both fabrics are, in fact, part of the same evolutionary process. An eigenvalue analysis allows the fabric shape to be quantitatively correlated with the magnitude of shear strain. Misorientation analysis suggests that the observed fabric evolution results from the competition of the two easiest slip systems in olivine, (010)[100] and (001)[100]. Our results open up the possibility of using olivine crystallographic fabrics or seismic anisotropy to quantitatively evaluate strain histories in both field studies and geophysical investigations of upper-mantle rocks. (C) 2013 Elsevier B.V. All rights reserved.; Geochemistry & Geophysics; SCI(E); EI; 6; ARTICLE; lars.hansen@earth.ox.ac.uk; 157-168; 387
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/216279]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Hansen, Lars N.,Zhao, Yong-Hong,Zimmerman, Mark E.,et al. Protracted fabric evolution in olivine: Implications for the relationship among strain, crystallographic fabric, and seismic anisotropy[J]. earth and planetary science letters,2014.
APA	Hansen, Lars N.,Zhao, Yong-Hong,Zimmerman, Mark E.,&Kohlstedt, David L..(2014).Protracted fabric evolution in olivine: Implications for the relationship among strain, crystallographic fabric, and seismic anisotropy.earth and planetary science letters.
MLA	Hansen, Lars N.,et al."Protracted fabric evolution in olivine: Implications for the relationship among strain, crystallographic fabric, and seismic anisotropy".earth and planetary science letters (2014).