MODELING PLASTIC-DEFORMATION OF PERIDOTITE WITH THE SELF-CONSISTENT THEORY

被引:135
作者
WENK, HR [1 ]
BENNETT, K [1 ]
CANOVA, GR [1 ]
MOLINARI, A [1 ]
机构
[1] FAC SCI METZ, PHYS MECAN MAT LAB, F-57045 METZ, FRANCE
来源
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1991年 / 96卷 / B5期
关键词
D O I
10.1029/91JB00117
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Theories for deformation of polycrystals have been substantially refined, enabling us to model deformation of metals and minerals with considerable sophistication. So far, most modelling has been confined to single-phase aggregates such as quartizite and limestone. We present the first results for a polyphase aggregate, peridotite, consisting of 70% olivine and 30% enstitite. The problem is approached with a viscoplastic self-consistent theory satisfying stress equilibrium and strain compatibility for the average polycrystal and taking account of anisotropic neighbor interactions. It is assumed that olivine deforms by (010)[100], (001)[100], and (010)[001] slip and enstatite deforms by (100)[001] slip. Simulated textures for olivine and enstatite in periodotite resemble simulated textures in the pure phases, indicating that for this system and for these volume fractions there is little influence of the different phases upon each other. In our model the harder mineral enstatite deforms at a slower rate than olivine. Interaction between neighboring grains appears to be minimal, which may be due to model assumptions. Predicted pole figures with olivine (010) axes and enstatite (100) axes aligning with the direction of shortening are in good agreement with preferred orientations in naturally and experimentally deformed peridotites.
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页码:8337 / 8349
页数:13
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