阿尔金造山带中、新生代的演化

塔里木盆地东缘的阿尔金造山带中、新生代经历了一个复杂的大地构造演化历程：中生代早期(T)为隆升夷平，中生代中后期(J-K)为裂陷沉积阶段；自古新世一中新世因塔里木盆地向东挤压使得阿尔金造山带东南缘出现了右行走滑仰冲，柴达木壳体向阿尔金造山带之下俯冲，阿尔金造山带隆起。塔里木盆地相对柴达木盆地向北移动，最大距离可达400～500km，使得原来统一的塔里木-敦煌-柴达木联合盆地裂解。由于逆冲走滑使阿尔金造山带内部发育了一系列小型的走滑盆地，形成了复杂的盆地沉积建造，并伴有动力变质及火山作用；中新世末，东西向挤

Evolution of the Altun Orogenic Belt in the Mesozoic and Cenozoic

The Altun orogenic belt on the eastern edge of Tarim basin experienced a complex geotectonic evolution in the Mesozoic and Cenozoic: uplifting and planation in early Mesozoic and collapsing and sedimentation in late Mesozoic. The eastward compression of Tarim Basin from Paleocene to Miocene resulted in the formation of a right-lateral slip obduction on the southeastern edge of the Altun orogenic belt and the subduction of Qaidam plate toward the Altun orogenic belt as well as the uplifting of this belt. Tarim basin migrated for a maximum distance of 400 to 500 km relative to Qaidam Basin, causing the disintegration of the originally integrated Tarim-Dunhuang-Qaidam Basin. The obduction strike-slip generated a series of small-sized strike-slip basins and a complex sedimentary formation accompanied by kinetic metamorphism and volcanism. The conversion of the east-west compression to a nonsymmetrical south-north couple-compression at the end of Miocene led to a structural reversion from right-lateral to left-lateral in the Altun orogenic belt and the disintegration of the integrated Tarim-Dunhuang basin. Tarim Basin drifted southward for more than 400 km. The eastward subduction of Tarim Basin caused drastic uplifting of the Altun orogenic belt. Besides, a series of small-sized basins were developed and a complex sedimentary formation was formed correspondingly in the Altun orogenic belt.