祁连-柴达木-东昆仑新元古-中生代沉积盆地演化

祁连-柴达木-东昆仑处于中央造山带的中西部, 经历了复杂的构造演化史.将祁连-柴达木-东昆仑地区划分为19个地层分区, 在总结各地层分区沉积盆地特征基础上, 讨论了祁连-柴达木-东昆仑地区的构造-沉积演化史: 新元古代-早古生代, 随着北祁连洋、赛什腾-锡铁山洋、东昆仑洋开始张裂, 研究区为陆缘裂谷、洋盆沉积; 早古生代末3个洋盆陆续消减闭合, 开始造山阶段的前陆盆地和碰撞造山后的陆缘裂陷沉积; 寒武纪-早-中三叠世, 东昆仑阿尼玛卿洋经历了拉张-俯冲-闭合, 之后全区进入陆内断陷、坳陷盆地阶段.研究区各地层分区的沉积盆地特征很好地记录了北祁连洋、赛什腾-锡铁山洋、东昆仑洋的开合及陆内造山等构造过程, 为重大构造事件提供了重要的沉积学证据. 

Evolution of Neoproterozoic-Mesozoic Sedimentary Basins in Qilian-Qaidam-East Kunlun Area

Qilian-Qaidam-East Kunlun area, located at the mid-western of the Central Orogenic Belt, has a complicated tectonic history. The tectonic-sedimentary evolution is discussed based on its sedimentary characteristics in this paper. During Neoproterozoic to Early Paleozoic, North Qilian Ocean, Saishiteng-Xitieshan Ocean, and East Kunlun Ocean opened, the study area developed continental-margin rift and ocean basin deposition. At the end of Early Paleozoic, foreland basin, continental-margin graben developed following the successive closing of the three oceans. From Cambrian to Early Triassic, A'nyemaqen Ocean completed an opening-closing cycle, and the study area began the phase of inland fault basin, downwarped basin deposits. The opening-closing cycles of ocean and intracontinent orogen are recorded in deposits of the study area, which provides sedimentary evidence for the above tectonic event.