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(二)由新变晶大小估计地幔应力近些年来,据天然橄榄石的变形结构、显微亚构造及实验研究的结果,提出了多种估计上地幔应力的方法。Nicolas(1978)曾对此进行过综合评述。归纳起来有两类方法,一类是建立在位错显微构造基础上的方法,如根据橄榄石的位错密度和位错曲率与应力之间的经验关系或亚颗粒大小与应力之间的关系来估算应力值;另一类方法是由动力重结晶的橄榄石晶粒(新变晶)的大小来估计上地幔应力的方法。对同一样品采用上述诸方法常不能得到相
Estimation of mantle stress from new metamorphic size In recent years, based on the deformation structure, microstructure and experimental results of natural olivine, various methods for estimating the stress on the mantle have been proposed. Nicolas (1978) has conducted a comprehensive review of this. There are two kinds of methods to be summed up. One is the method based on the microstructure of dislocations. For example, based on the dislocation density of olivine and the empirical relationship between the dislocation curvature and stress or the relationship between the sub-particle size and stress Relationship; and the other is to estimate the stress of the upper mantle from the size of dynamic recrystallized olivine grains (new crystals). Of the same methods using the above methods often can not get the phase