CAJ | 학술논문

在对大量逆冲与平移断层运动学详细分析与观测的基础上,本文利用实测断层擦痕矢量数据组进行了区域应力场反演,根据对断层叠加关系的分析及叠加褶皱的验证,划分出上扬子北部经历过3期挤压构造应力场演化,从早到晚分别为:第1期北西-南东向挤压应力场,第2期近东西向挤压应力场和第3期北东-南西向挤压应力场.结合相关的地质现象,认为在这3期挤压应力场作用下分别形成了晚侏罗世末-早白垩世初的湘鄂西隔槽式褶皱带、早白垩世末-晚白垩世初的川东隔档式褶皱带和南大巴山弧形褶皱带.由此表明,上扬子北部褶皱带的形成顺序为湘鄂西隔槽式褶皱带→川东隔档式褶皱带→南大巴山弧形褶皱带.
재대대량역충여평이단층운동학상세분석여관측적기출상,본문이용실측단층찰흔시량수거조진행료구역응력장반연,근거대단층첩가관계적분석급첩가습추적험증,화분출상양자북부경력과3기제압구조응력장연화,종조도만분별위:제1기북서-남동향제압응력장,제2기근동서향제압응력장화제3기북동-남서향제압응력장.결합상관적지질현상,인위재저3기제압응력장작용하분별형성료만주라세말-조백성세초적상악서격조식습추대、조백성세말-만백성세초적천동격당식습추대화남대파산호형습추대.유차표명,상양자북부습추대적형성순서위상악서격조식습추대→천동격당식습추대→남대파산호형습추대.
Based on kinematic analysis and measurements of reverse and wrench faults,stress field analysis is undertaken by using fault-slip datas from the northern Upper Yangtze region. The fault overprinting and superposed folds demonstrate that three phases of stress fields from the NW-SE compression,nearly EW compression to NE-SW compression occurred in the region. Analyses of geological phenomena suggest that the first phase of compression is responsible for the western Hubei and Hunan chevron syncline-box anticline belt of latest Late Jurassic to earliest Early Cretaceous,the second one is responsible for the eastern Sichuan chevron anticline-box syncline belt of latest Early Cretaceous,and the third one is responsible for the southern Daba arcuate fold belt of latest Early Cretaceous to earliest Late Cretaceous. All of these indicate that the fold belts in the northern Upper Yangtze region experienced the evolution from the western Hubei and Hunan fold belt,the eastern Sichuan fold belt to the southern Daba arcuate fold belt. Southern Daba arcuate fold belt,Eastern Sichuan chevron anticline-box syncline