塔里木地台开合构造简述

从开合构造看，塔里木是经一期裂解两期克拉通化而形成的地台。古元古代末，第一期克拉通化，形成塔里木原地台。中─新元古代，在塔南和塔北地区发育稳定型盖层沉积。中元古代，在塔西和塔北地区，原地台裂解形成裂陷槽，发育活动型沉积。蓟县纪末─青白口纪初，第二期克拉通化，裂陷槽沉积产生褶皱和变质，形成塔里木地台。塔里木地台形成后并未完全稳定下来，震旦纪─泥盆纪时在塔北又裂解形成裂陷槽。石炭纪初，第三期克拉通化，裂陷槽封闭形成塔里木新地台。

OPENING-CLOSING TECTONICS OF TARIM PLATFORM

In view of opening-closing tectonics, Tarim platform underwent one phase of splitting and two phases of cratonization. At the end of paleo-Proterozoic the first phase of cratonization led to the formation of proto-Tarim platform. Dring the Meso,Ceno-Proterozoic stable cover deposits were developed in the Southern Tarim and Northern Tarim regions. In the Western Tarim and Eastern Tarim regions proto-platform was splitted to form cracking trough with active sediments during the Meso-Proterozoic. The second phase of cratonization occured from the end of Jixian to early Qinbaikou, during which cracking though sediments were folded and metamorphosed to form Tarim platform.Tarim platform was not stable yet after its formation. It was splitted again to form cracking trough in the Northern Tarim region. Up to early Carboniferous the third-phase cratonization resulted in the closing of cracking trough and formation of Tarim neo-platform. Since the term "Tarim platform" is very popular , it is also adopted in this paper.