塔里木盆地北部构造转换形式及其成因

摘 要　 塔里木盆地北部褶皱 逆冲断层变形在平行于区域构造方向上通过构造转换而变化。 构造转换形式包括纵向(渐变)和横向(突变)两种。 变形缩短程度沿走向保持均一或渐变时发 生纵向转换, 其中包括雁列式断裂间的转换和逆冲断层向其他构造(末端背斜、 分支断层)的 转换, 横向转换调节变形缩短程度沿走向的突然变化。 在前陆盆地内, 横向转换带的发育主 要与沉积层厚度变化、 滑脱层分布、 造山带的作用程度和方式有关;前陆克拉通地区横向转 换带的发育则可能主要与板块边界形态等边界条件有关。 纵向转换带的发育与内在、 外在变 形条件沿走向的渐变有关

TECTONIC TRANSFER STYLE AND ITS ORIGIN IN NORTHERN TARIM BASIN

The structural deformational degree and style commonly change along the regional tectonic strike of Northern Tarim Basin by tectonic transfer.Tectonic transfer style includes longitudinal (progressive) tectonic transfer and transverse (abrupt) tectonic transfer.Longitudinal tectonic transfer maintains the overall displacement or shortening across the fold thrust belts to be constant or gradual change along the tectonic strike.This form of tectonic transfer can be subdivided into two situations:(1) tectonic transfer between echelon master thrusts;(2) tectonic transfer from the individual master thrust to terminal anticline or distributive faults.Transverse tectonic transfer results from overall displacement or shortening change abruptly along the tectonic strike.The development of transverse transfer zones may be related to sedimentary layer thickness variation,detachment layer distribution extent,the variation of the degree and mode of South Tianshan orogenic belt influence along the strike in foreland basin,or the variation of boundary conditions, such as plate boundary geometry,in foreland craton.