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本文研究了断层岩中变形矿物内部常见的显微构造现象——镶嵌状消光的特征及其产出状态、形成条件和机制。具镶嵌状消光的矿物实质是由若干细粒级的、互相紧密嵌合的碎裂消光亚晶粒组成,它们在形态、粒级以及产出、分布等方面都具一定的特征。该微构造现象是在相对低温、较高差异应力条件下形成的,为岩石脆性或韧脆性变形的结果,为一低温动态回复现象,属位错作用下的亚晶粒旋转形成机制。依据研究结果,作者将矿物在低温条件下碎裂作用的演化过程划分为位错→位错壁→碎裂亚晶粒→碎裂新晶集合体等四个阶段,并确定了镶嵌状消光现象的判別准则。
In this paper, we study the microstructures, the mosaic extinction characteristics, the production status, the forming conditions and the mechanism of the common microstructure in deformed minerals in the fault rocks. Inlaid extinction of minerals by a number of fine-grained, closely intermingle chipped matte subgrains, which in the form, size and output, distribution, etc. have certain characteristics. The micro-structure phenomenon is formed under the conditions of relatively low temperature and high differential stress. It is a result of rock brittleness or ductile-brittle deformation. It is a low temperature dynamic recovery phenomenon and belongs to the subgrain rotation mechanism under dislocation. According to the research results, the author divides the evolution process of minerals under the condition of low temperature into four stages of dislocation → dislocation wall → disintegration subgrain → disintegration new crystal aggregate, and determines the mosaic extinction phenomenon Criteria for discrimination.