塔里木盆地东南缘中新生代变形史与构造演化

Deformation History and Tectonic Evolution of Southeastern Tarim Basin in Mesozoic and Cenozoic

通过野外地质调查、地球物理资料解释和沉积相特征分析,构建了塔里木盆地东南缘地区地质大剖面。在平衡恢复的基础上,探讨了中新生代构造变形历史和盆地构造演化过程。结果表明,塔里木盆地东南缘经历了三叠纪末逆冲推覆变形,早侏罗世伸展变形,晚白垩世晚期-古近纪早期挤压变形,古近纪弱伸展变形和中新世以来逆冲-走滑变形;而塔东南地区盆地构造演化则经历了早侏罗世伸展断陷盆地阶段,中侏罗世-晚白垩世早期坳陷盆地阶段,晚白垩世晚期-古近纪早期挤压-抬升-剥蚀阶段,古近纪弱伸展盆地阶段和中新世以来陆内走滑型挤压挠曲盆地阶段等五个阶段的演化。

Combined with the interpretation of seismic profiles and the characteristics of sedimentary faces together with field investigation, the regional geological sections have been constructed in the southeastern Tarim basin. The tectonic evolution of the southeastern Tarim basin aged from the Mesozoic to Cenozoic has been studied in detailed by the balanced-section technique. The results indicate that the southeastern Tarim basin has experienced the following evolution： 1） late Triassic thrusting, 2） early Jurassic extensional normal faulting, 3） contractional deformation from late stage of Late-Cretaceous to early Paleogene, 4） Paleogene weak extension and thrusting and strike-slipping since Miocene. The tectonic evolution of southeastern Tarim basin can be also further divided into five stages, including extensional normal fault depression in the early Jurassic, thermal-subsidence depression from middle Jurassic to early late-Cretaceous, compression-uplift-denudation from the late Cretaceous to early Paleogene, weak extensional depression in the Paleogene and compression flexural depression caused by the lateral strike-slipping since the Miocene.