天山博罗霍洛地区构造与演化

天山博罗霍洛地区构造是以中—上元古界为主体组成的赛里木地块为核部,以古生界为两翼的复式背斜构造为骨架,以两翼的扇形逆冲断裂推覆构造十分发育为特征。总结其演化历史,可归纳为:早元古代古陆壳的形成;中—晚元古代稳定型大陆边缘的发育;早古生代大陆裂谷作用;晚古生代活动大陆边缘的形成与造山;中—新生代断块升降、滑脱推覆构造叠加、改造、而形成极其复杂的构造形态。

THE STRUCTURE AND EVOLUTION OF THE BOROHORO AREA IN THE TIANSHAN

The features of the structure in the Borohoro area of the Tianshan mountains is mainly anticlinorium that takes the Serim uplift as the core which is made up of the Middle-Upper Proterozoic, and accompanied by the development of the fan thrust-nappe structures.The evolution process of the earth crust in this area has gone through five stages: ( 1 ) the formation of the old landmass in the Early Proterozoic; ( 2 ) the development of the passive continental margins in the Middle-Late Proterozoic era; ( 3 ) continental rifting in the Early Palaeozoic era; ( 4 ) subduction orogeny of the active continental margins in the Late Palaeozoic era and(5)the superposition and deformation of the fault-blocks and decollement-nappe structures in the Mesozoic-Cenozoic era.During the process an extremely complecated tectonic regime has been formed.