准噶尔盆地南缘小渠子背斜T／P同构造不整合几何学、运动学特征及地质意义

The geometry and kinematic characteristics of T/P syn-tectonic unconformities at Xiaoquzi anticline and its geological significance to tectonic evolution at the south margin of Junggar Basin

为探讨准噶尔盆地南缘二叠纪-三叠纪盆地构造性质及构造演化过程，笔者对盆地南缘小渠子背斜保存较完整的T／P不整合进行了几何学、运动学和沉积韵律旋回特征的分析。T／P不整合具有同构造不整合的特点，表现为不整合之下削蚀、之上超覆，是由于盆地南缘经历晚二叠世-早三叠世区域性挤压作用造成的。通过对小渠子地区深层地质结构的分析，认为晚二叠世-早三叠世的构造演化过程与早石炭世伸展断陷的反转密切相关。

In order to obtain the tectonic property and evolution at the south margin of Junggar Basin during Triassic and Permian, the authors make close study about the geometry and kinematics of T/P unconformity and sedimentary cycles in Xiaoquzi anticline at the southern margin of Junggar Basin. The T/P unconformity is a syn-tectonic unconformity with the characteristics of erosion at the top of middle Permian and overlapping at the Lower Triassic, which was caused by the rapid uplifting of Xiaoquzi area during Late Permian to Early Triassic. Through deciphering the deep structure at Xiaoquzi anticline, we found that the Late Permian to Early Triassic compressional tectonic environment has much close relationship with inversion of the Early Carboniferous extensional structure.