英吉苏凹陷中─新生代背驮式前陆盆地构造特征及成因机制

Structural Features and Genetic Mechanism of Piggyback Foreland Basin of the Meso - Cenozoic in Yingjisu Subsidence

英吉苏中新生代凹陷是在古生代逆冲推覆构造背景之上发育起来的背驮式前陆盆地。盆地的沉积作用和变形作用严格受基底参与的逆冲断层的控制。中新生代构造由北向南可划分七个带：北部斜坡带；群克─新开屏背斜带；英北向斜带；阿拉干背斜带；英南向斜带；古城墟斜坡带和罗布庄断凸带。叠瓦式逆冲断层、冲起构造、构造三角带、断展褶皱和披覆构造是英吉苏凹陷的主要变形样式。自三叠纪以来，不同时期的沉积中心自造山带向前陆方向迁移。 中新生界变形的动力学和运动学是与塔里木板块南缘活动大陆边缘的板块拼贴事件和壳内拆离缩短作用有关。

Yingjisu subsidence of the Meso - Cenozoic was a piggyback foreland basin that developed on the base of fold - thrust belts of the Paleozoic. The sedimentation and deformation in the basin are controlled strictly by fold - thrust belts with besement involved type. Meso -Cenozoic structures can be divided into seven structural belts from north to south: Northern slop belt, Quenkou - Xinkaiping anticline belt, Ying - northern syncline belt, Aragan anticline belt, Ying - southern syncline belt, Guchengxiu slop belt and Luobuzhuang fault uplift. The imbricat-ed thrust, pop - up, drape anticline assemblage and fault - propagation fold are major structural styles of Yingjisu subsidence. The subsidence center of different period has been moved from orogenics to the foreland basin since Triassic. The dynamics and kinematics of the deformation in the Meso - Cenozoic are related to the plate amalgamation of the active continental margin in the southern margin of Tarim plate and the deep intracrustal decollement - shortening.