米仓山构造转换带特征及转换模式

米仓山构造带被北东走向的龙门山陆内复合造山带及北北西走向的大巴山前陆冲断带夹持于其间,两个构造带平面上组成一个“八”字形构造,空间上为一个向北收敛,向南发散背倾型的Ⅰ型三角带构造.在两大构造带前展式扩展变形晚期的过程中,米仓山则起到调节这两大构造带构造平衡的作用,因此为一构造转换带.米仓山构造转换带由北向南可以分为基底...

The characteristic and transfer model of Micang Mountain structural transfer zone

Micang Mountain structure belt，locating between the NE striking Longmen Mountain intracontinental composite orogenic belt and the NW striking Daba Mountain foreland thrust belt，forms a triangle structural zone，like Chinese eight，which is converge to north and diverge to south.Micang Mountain structure belt plays as an important structural transfer zone in adjusting structural balance between the Longmen Mountains intracontinental composite orogenic belt and the Daba Mountain foreland thrust belt in the process of piggy back deformation.Micang Mountain structural transfer zone can be divided to basement thrust uplift zone，detachment deformation zone，northern Sichuan para foreland zone，from north to south.Due to basement rock rigidity，basement thrust uplift zone and northern Sichuan para foreland zone have marked disparity in the process of adjusting structural balance.Brittle faults mainly took place at the basement thrust uplift zone with the way of vertical uplift and horizontal contract to adjust structural balance.While northern Sichuan para foreland zone，with weakly competent rock，mostly formed NW and NW striking folds and faults to adjust structural balance.Our research on structural feature of the Micang Mountain shows that，physical character of basement rock and pre exist basement structure are the first order factor of deformation diversity，and structure shrinkage and the contract ratio are subordination factor.