影响橄榄石集合体蠕变性质物化因素的研究进展

doi:10.7523/j.issn.2095-6134.2005.3.003

摘要/Abstract

摘要：

综述了高温高压条件下岩石和矿物流变性的实验研究结果,总结了影响橄榄石集合体流变性能的各种物理和化学因素.岩石和矿物在高温高压条件下变形的微观机制主要有2种:扩散蠕变和位错蠕变.橄榄石集合体在扩散蠕变机制作用下,应变率ε和差应力之间的关系为线性;在位错蠕变机制作用下,差应力指数n约等于3.在相同差应力作用下,温度、熔融组分与橄榄石集合体的应变率是正相关的.含水条件下,橄榄石集合体的强度显著降低.颗粒度对差应力和应变率的影响比较复杂,低应变率和小颗粒度对应的差应力指数约等于1;高应变率和粗糙颗粒度时,n为3左右.

关键词: 扩散蠕变, 位错蠕变, 差应力, 应变率, 橄榄石集合体

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

中图分类号:

P584

王文博, 杨振涛, 赵永红. 影响橄榄石集合体蠕变性质物化因素的研究进展[J]. 中国科学院大学学报, 2005, 22(3): 270-278.

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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