摘要
本文在简要分析清江流域区域构造格架及其演化序列的基础上，将清江流域中新生代区域构造应力场划分为：燕山主期、喜马拉雅主期和现今构造应力场。进而利用共轭节理、断层擦痕、显微构造分析、震源机制解和地应力测量资料等定量反演各期构造应力场的主应力方法；同时利用岩石破坏准则、方解石ｅ双晶和变形矿物的位错密度等定量估算其差异应力。并结合有限元模拟计算，探讨清江流域中新生代区域构造应力场的基本特征及其演化规律，为区域地壳稳定性评价提供重要依据。
On the basis of analysis of regional structure outline and structure evolution sequence,regionalstructure stress fields of Mesozoic-Cenozoic era in Qing River basin were divided in to the major Yan-shanian,the major Himalayan and present structure stress fields.Stress directions of these stress fieldswere determined from striation measurment on fault planes,analysis of conjugate joints and mi-crostructures near faults,mechanism analysis of earthquak e focus and information of in situ stressmesurement.Also the differentical stress was estimated by use of the criterion on rock fracturing,cal-cite twin lamellae and dislocation density in deformed mineral.Then,according to the results of finiteelement modelling,a discussion was made on the basic characters and the evolution process of Meso-zoic-Cenozoic era regional stress fields,which provides the basis for assessing the crustal stability of thearea.
关键词
清江流域
构造应力场
燕山期
区域构造
鄂西
Qing River basin structure stress fields the major Yanshanian phases the majorHimalayan phases
