摘要
塔北隆起在塔里木叠合盆地演化时期经历了古克拉通隆起、早期前陆前缘隆起、库车再生前陆盆地斜坡3个阶段。经过两期成盆构造变革阶段,塔北隆起北部垂向上叠加深、浅层两组断裂系统:深层断裂系统为基底逆冲断裂,发育冲断构造、背冲构造组合;浅层断裂系统为正断层,发育地堑、地垒构造样式组合。两组不同性质断裂系统的发育均对应于两期造山挤压背景下前陆盆地形成阶段。笔者认为,深层断裂并非是处于早期前陆变形区域,而是处于挤压背景下板内塔北古克拉通隆起“纵弯”构造变形中岩层破裂的结果。浅层断裂是库车再生前陆盆地阶段塔北隆起北部基底(前中生界构造层)受水平挤压翘曲变形(纵弯变形)导致上覆岩层引张破裂的结果。
During the evolution of the Tarim superposed basin, the Tabei uphtt went tnrougn mree stages： old craton uplift, early foreland front uplift and Kuqa regenerated foreland basin slope. It experienced two stages of basin-forming structural transformation, giving rise to the deep- and shallow-level systems of overlapped faults in the north of the Taibei uplift： the deep-level fault system is a basement thrust one marked by a combination of thrusts and backthrusts, and the shallow-level fault system is a normal fault one, marked by a combination of grabens and horsts. The two fault systems with different characters correspond to two stages of formation of the foreland basin in the orogenic compressional environment. The deep faults were not formed in the early foreland deformation zone but resulted from fracturing of rocks during the longitudinal buckling of the intraplate Tabei old craton uplift in a compressional environmentoverlying strata due to lateral compressional basement （pre-Mesozoic tectonic layer） inThe shallow faults are the result of extensional fracturing of thewarping deformation （longitudinal buckle deformation） of the basement （pre-Mesozoic tectonic layer） in the north of the Tabei uplift in the stage of the Kuqa regenerated foreland basin.
出处
《中国地质》
CAS
CSCD
2005年第3期378-385,共8页
Geology in China
基金
国家"973"项目(G1999043305)
国家自然科学基金项目(40172076)资助。
关键词
叠合盆地
构造变革
叠加断裂
纵弯变形
基底翘曲
superposed basin
structural transformation
overlapped fault
longitudinal buckling
basement warping
