A kinematic model for recrystallization and texture development in olivine polycrystals

被引:134
作者
Kaminski, É [1 ]
Ribe, NM [1 ]
机构
[1] IPG Paris, Lab Dynam Syst Geol, F-75252 Paris 05, France
关键词
dynamic metamorphism; recrystallization; seismic city; anisotropy;
D O I
10.1016/S0012-821X(01)00356-9
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The interpretation of seismic anisotropy in the mantle requires a knowledge of the relationship between the lattice preferred orientation (LPO) of crystals and the convective flow field. In order better to understand this link, we present a model for the evolution of LPO in olivine aggregates that deform by both intracrystalline slip and dynamic recrystallization. Dynamic recrystallization depends on the dislocation density of the grains, which is a function of the applied local stress. Grains with a large density of dislocations lower their bulk strain energy by nucleating strain-free sub-grains at a rate proportional to a dimensionless nucleation parameter lambda*. Grains with high energy are then invaded by grains with low energy by grain-boundary migration, at a rate proportional to a dimensionless grain-boundary mobility M*. The value of lambda* is constrained by observed LPO patterns in experimentally deformed olivine aggregates, and M* is constrained by the temporal evolution of the strength of the LPO. For M* = 125 +/- 75 and M* > 3, the model predictions agree well with the experimental results. Numerical calculations of LPO using our model are significantly faster than those based on viscoplastic self-consistent or equilibrium-based theories, making the model especially suitable for applications for complex convective flows. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:253 / 267
页数:15
相关论文
共 37 条
[1]  
Anderson D. L., 1989, THEORY EARTH
[2]   HIGH-TEMPERATURE CREEP OF OLIVINE SINGLE-CRYSTALS .1. MECHANICAL RESULTS FOR BUFFERED SAMPLES [J].
BAI, Q ;
MACKWELL, SJ ;
KOHLSTEDT, DL .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1991, 96 (B2) :2441-2463
[3]   HIGH-TEMPERATURE CREEP OF OLIVINE SINGLE-CRYSTALS .2. DISLOCATION-STRUCTURES [J].
BAI, Q ;
KOHLSTEDT, DL .
TECTONOPHYSICS, 1992, 206 (1-2) :1-29
[4]  
Ben Ismail W, 1998, TECTONOPHYSICS, V296, P145
[5]  
Bunge H. J., 1982, Texture analysis in materials science: mathematical methods
[6]   High shear strain of olivine aggregates: Rheological and seismic consequences [J].
Bystricky, M ;
Kunze, K ;
Burlini, L ;
Burg, JP .
SCIENCE, 2000, 290 (5496) :1564-1567
[7]   ANISOTROPIC CONVECTION WITH IMPLICATIONS FOR THE UPPER-MANTLE [J].
CHASTEL, YB ;
DAWSON, PR ;
WENK, HR ;
BENNETT, K .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1993, 98 (B10) :17757-17771
[8]   PLASTIC-FLOW OF ORIENTED SINGLE-CRYSTALS OF OLIVINE .1. MECHANICAL DATA [J].
DURHAM, WB ;
GOETZE, C .
JOURNAL OF GEOPHYSICAL RESEARCH, 1977, 82 (36) :5737-5753
[9]   PLASTIC-FLOW OF ORIENTED SINGLE-CRYSTALS OF OLIVINE .2. OBSERVATIONS AND INTERPRETATIONS OF DISLOCATION-STRUCTURES [J].
DURHAM, WB ;
GOETZE, C ;
BLAKE, B .
JOURNAL OF GEOPHYSICAL RESEARCH, 1977, 82 (36) :5755-5770
[10]   PLANE KINEMATIC MODEL OF PROGRESSIVE DEFORMATION IN A POLYCRYSTALLINE AGGREGATE [J].
ETCHECOPAR, A .
TECTONOPHYSICS, 1977, 39 (1-3) :121-139