东喜马拉雅构造结大陆碰撞以来构造年代学框架及其与哀牢山红河构造带的对比

The Structural-Chronological Frame of the Eastern Himalayan Syntaxis since the India-Asia Collision and Its Correlation with the Ailaoshan-Red River Structural Belt

东喜马拉雅构造结经历了前期楔入和后期垮塌变形。楔入事件发生于～ 6 0Ma、～ 2 3Ma和～ 13Ma,垮塌开始于 6～ 7Ma。哀牢山红河构造带同样经历早期走滑和后期正断 ,走滑年代分别为 5 8～ 5 6Ma、2 3Ma和 13Ma ,后期正断开始于 5 .5Ma。上述年龄的意义在于 :～ 6 0Ma的变形代表印度与欧亚大陆的初期碰撞 ;2Ma为青藏高原及邻区的主变形期 ;13Ma的变形也代表一次汇聚事件 ,并形成青藏高原的东西向伸展。 6～ 7Ma以后的垮塌作用代表了青藏高原的快速隆升。

The eastern Himalayan syntaxis experienced early indentation and later collapse. The indenting events happened at ～60 Ma, ～23 Ma and ～13 Ma respectively, and the collapse occurred since 7-6 Ma. The Ailaoshan-Red River structural belt also underwent early lateral slip and later normal faulting. Ages for the slip are 58-56 Ma, 23 Ma and 13 Ma respectively, and the normal faulting began at ～5.5 Ma. The significance of these ages is that: the deformation of ～60Ma maybe represent the initial India-Asia collision; the deformation of 23 Ma was the main tectonic event happening in Tibet and the adjacent regions; and the deformation of ～13 Ma also stand for a convergent event that caused the east-west extension in Tibet. The collapse since 7-6 Ma represent the rapid uplift of the Tibetan Plateau.