塔里木盆地西南缘的岩石组合及其构造演化

塔里木盆地西南缘可划分为喀喇昆仑、西昆仑、塔里木等三个地层区和康西瓦、库地等两个缝合带。自震旦纪以来,该区经历了震旦纪—泥盆纪和石炭纪—第四纪两大构造旋回。对应每一旋回,喀喇昆仑地层区和塔里木地层区发育有被动大陆边缘盆地和碰撞造山两种类型的岩石组合。西昆仑地层区发育了被动大陆边缘盆地、俯冲消减带和碰撞造山等三种类型的岩石组合。康西瓦缝合带是康西瓦洋经历了震旦纪—中泥盆世和早石炭世—晚侏罗世两次开合后的遗迹,它既是喀喇昆仑和西昆仑两个地层区的分界线,又是羌塘和塔里木两个板块的分界线;库地缝合带则是库地洋经历早石炭世—早二叠世一次开合的遗迹,分割了西昆仑和塔里木这两个地层区。

Rock Association and Tectonic Evolution on the Southwestern Edge of Tarim Basin

The southwestern edge of Tarim Basin may be divided into three strati- graphic zones of Kala Kunlun,West Kunlun,Tarim and two sutures of Kangxiwa and Kudi.Since Sinian,the region has undergone two big tectonic cycles of Sinian-Devonian and Carboniferous-Quaternary. For Kala Kunlun and Tarim,two kinds of rock associations,passive continental marginal basin and collision orogenic belt,are developed corresponding to each cycle.But for West Kunlun,there are three types of rock associations of passive continental marginal basin,subduction zone,orogenic belt as well.Kangxiwa suture is a trace of Paleo- Kangxiwa Ocean having experienced twice opening and closing in Sini- an-Middle Devonian and Early Carboniferous-Later Jurassic.It is both the boundary of Kala Kunlun and West Kunlun and the boundary of Qiangtang Plate and Tarim Plate.Kudi suture is a trace of Paleo-Kudi Ocean having experienced once opening and closing in Early Carbonif- erous-Early Permian,which is the boundary of West Kunlun and Tarim.