略论塔里木古生代盆地演化

依据所处板块构造位置和地球动力学环境，提出塔里木古生代盆地演化经历了震旦—泥盆纪和石炭—二叠纪两个完整的开合旋回。第一旋回自震旦纪开始张裂形成大陆裂谷，寒武—奥陶纪伸展为被动大陆边缘，志留—泥盆纪俯冲消减，泥盆纪晚期碰撞闭合，时间跨度达４００Ｍａ以上。第二旋回表现为石炭—二叠纪弧后拉张—弧后造山事件，延续仅约１００Ｍａ。

A DISCUSSION ON PALEOZOIC TECTONIC EVOLUTION OF TARIM BASIN, NORTHWEST CHINA

It is indicated that Paleozoic Tarim underwent Sinian Devonian and Permo Carboniferous open close cycles according to the plate tectonic setting and geodynamic scenario. The former cycle had initiated extension since Sinian and formed continental rift systems. Further stretching resulted in South Tianshan and Kudi Altun ocean and the passive continental margins had came into being during Cambrian Ordovician. Subduction and consumption occurred during Silurian Devonian, and collision took place at the Late Devonian. The time span of Sinian Ordovician open close cycle is up to 400Ma. The latter cycle represented Carboniferous Permian back arc extension and orogenesis, and lasted about 100Ma.