摘要
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.
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 Neoprot-erozoic 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.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2014年第8期1000-1016,共17页
Earth Science-Journal of China University of Geosciences
基金
中国地质调查局项目(Nos.1212010733802
12120113012500)
