Ihe Effect of Physical and Cherracal Environment on RheologicalBehavior of Olivine Aggregates

doi:10.7523/j.issn.2095-6134.2005.3.003

Abstract

Abstract:

The cxperimental results of rheological properties of rocks and minerals were reviewed in this paper. The physical and chemical factors that influence creep behavior of olivine aggregates were discussed in detail. Rocks and minerals have two major micro mechanisms when defomed under high temperature and high pressure. One is diffusion creep and the other is dislocation creep. In the diffusion creep rcgime, the stress-strain relation is linear and in dislocation creep regime, the stress strain relation is power law for olivine aggregates. 100MPa is the trarxsition stress between diffusion creep regime and dislocation creep regime. When the temperature or melt-fraction increases, strain rate will increase under the sane stress level. Water can strongly weaken the strength of olivine. Grain size is a complicat,d factor. Observations suggest that the defamation mechanis in the grain size insensitive regune is dislocation creep, while that in the grain size sensitive regime is diffusion creep.

Key words: diffusion creep, dislocation creep, differential stress, strain rate, olivine aregates

CLC Number:

P584

WANG Wen-Bo, YANG Zhen-Tao, ZHAO Yong-Hong . Ihe Effect of Physical and Cherracal Environment on RheologicalBehavior of Olivine Aggregates[J]. , 2005, 22(3): 270-278.

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