摘要:银根—额济纳旗盆地简称银额盆地，是中亚造山带南缘的一个中-新生代沉积盆地。最近的野外地质调查，在其西缘发现早侏罗世和第四纪晚期的伸展构造。早侏罗世的伸展构造为一系列走向NNW-SSE 的正断层，是下侏罗统的同沉积断层。这组正断层与银额盆地内NNE-SSW 走向的正断层组合成共轭断裂系统，指示古构造应力场的最大主拉张应力方向为近E-W。它们是中亚造山带（南缘）造山后应力伸展阶段的构造变形。第四纪晚期的伸展构造是由两条倾向相向的正断层组合成的地堑构造，走向进E-W，可能代表了喜马拉雅碰撞造山远程效应脉动式演化过程的一个构造间歇期。?
关键词: 伸展构造/
早侏罗世/
第四纪晚期/
造山后应力松弛/
喜马拉雅碰撞造山远程效应/
构造间歇期/
银额盆地/
中亚造山带
Abstract:Yingen-Ejinaqi Basin, Yin-E Basin for short, is a Meso-Cenozoic basin on the southern margin of the central Asian orogenic belt. During our 2017 field geological investigation, Early Jurassic and Late Quaternary extensional structures were found on the western margin of the Yin-E Basin. The Early Jurassic extensional structures are a series of normal faults striking NNW-SSE. They are the syn-sedimentary faults of the Lower Jurassic strata. These normal faults and the NNE-SSW striking normal faults in the Yin-E Basin constitute a conjugate system indicating the maximum extensive stress in N-S direction in Early Jurassic. They are the post-orogenic structures of the central Asian orogenic belt. The Late Quaternary extensional structure is a graben composed by two normal faults dipping to each other. The normal faults strike in E-W direction. They represent possibly a tectonic pause between two successive thrust pulses of the far-field effect of the India-Asia collision.?
Key words:Extensional structures/
Early Jurassic/
Late Quaternary/
Post-orogenic stress relaxation/
Far-field effect of the India-Asia collision/
Tectonic pause/
Yingen-Ejinaqi Basin/
Central Asian orogenic belt
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