一种挤压构造背景下正断层的成因模式

提出区域挤压背景下盆地内部一种正断层的成因模式,这类正断层通常叠加在下伏古构造隆起和基底断层之上。分析认为,区域挤压背景下,由基底挤压收缩造成的基底隆起、翘曲和基底断块隐伏活动是诱导上覆盖层引张构造变形的主要动力机制,古构造格架特征是决定正断层成因发育的先决条件。正断层的成因充分证实了盆地基底对盖层构造变形的控制作用,是盆地演化过程中基底与盖层不相协调统一变形的产物。在我国塔里木盆地北部隆起、准噶尔盆地腹部均发育有这种成因类型的正断层。

A Genetic Model of Normal Fault Under Compressive Tectonic Setting

This paper presents a genetiic model of mormal fault in the interior of basin under regiong compressive tectonic setting,The normal fault is often superimposed underlying paleo-uplift and basement faults.This study suggests that the basement uplift,warpage and basement fault block activity caused by basement compression and contraction under regional compressive setting are primary dynamic mechanism indueed extensional deformation of overlying cap rocks,while the paleo-structural framework is the premise conditiion for the mormal fault origin and development.It is indicated from the orgin of normal fault that ther control effect of basin basement on the structural deformation of cap rocks is the product of inharmonic deformation between basement and cap rocks during evolution of basin,This kind of normal fault has been forund in northern uplift of Tarim basin and hinterland of Junggar basin.