摘要
本文概述了利用变形石英晶内自由应错密度估算古应力值的一般理论和方法。在详细进行超微构造观测的前提下,估算了相当于燕山早期和燕山晚期密山—抚顺断裂带的古构造应力值,分别为86.6或142.6MPa和73.9或126.3MPa。文章强调,尽管这样方法仍属半定量研究,但它已成为构造应力场研究不可缺少的手段。断裂带在地壳浅部亦会发生部分韧性变形。
A theory and method on evaluating paleostress value by using the free dislocation density in deformed quartz crystal are introduced in this paper. On the premise of detailed observation of the super-microstructure the paleostress value of the SW section of the Mishan-Fushun Fault Zone has been calculated. The result shows that the stresses of Early and Late Yanshan Movements are 86.6 or 142.6 MPa and 73.9 or 126.3 MPa respectively. The paper emphasizes that the method is semi-quantitative but it is a necessary means of studying a structral stress field. The shallow parts of a fault zone can also develop loeal ductility deformation.
