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本文侧重于利用变形矿物显微构造估算断裂带古应力值的一些理论分析和方法介绍。并以变形石英晶内自由位错密度ρ和方解石变形双晶百分比分别估算了沂沭断裂带西支北段的沂水-汤头断裂及鄌郚-葛沟断裂燕山晚期(K_1后)构造活动的应力值,其结果分别为1000—1500巴和700—1100巴量级。断裂带显微构造可能表明在地质时期的构造应力场作用中,稳态位错蠕变既可发生于韧性变形,又可发生于脆—韧性变形过程中。考虑到断层带“水”的因素,估算中采用McCormick关系式较Weathers关系式可能更接近实际。
This paper focuses on the theoretical analysis and methodological introduction of using the deformed mineral microstructure to estimate the ancient stress of the fracture zone. The Yishui-Tangtou fault and the later Yanshanian tectonic activity in the Yishan-Gugou fault in the Yishu fault zone were estimated by the free dislocation density ρ and the calcite dendrite percentage, respectively Stress values, the results of which are on the order of 1000-1500 bar and 700-1100 bar, respectively. The microstructure of the fault zone may indicate that during the geological tectonic stress field, steady-state dislocation creep may occur both in ductile deformation and in brittle-ductile deformation. Taking into account the “water” fault zone, the McCormick correlation may be more realistic than the Weathers relationship.