西藏班公湖地区侏罗纪—白垩纪沉积及古海洋盆地的演化  

Jurassic-Cretaceous sedimentation and evolution of ancient oceanic basin in Bangong Lake Area,Tibet

作　　者：谢国刚[1,2] 莫宣学[1] 赵志丹[1] 董国臣[1] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]江西省地质矿产勘查开发局,江西南昌330002

出　　处：《地学前缘》2009年第4期31-39,共9页Earth Science Frontiers

基　　金：中国地质调查局项目"1:25万日土县幅;喀纳幅(国内部分)区域地质调查"(200213000008)

摘　　要：在西藏1∶25万喀纳幅、日土县幅地质调查图成果的基础上,重建了班公湖—怒江结合带西段3个地层区的侏罗纪—早白垩世沉积地层序列,对地层纵向、横向序列变化和沉积环境进行对比分析,指出在侏罗纪—早白垩世时,班公湖—怒江中特提斯洋盆沉积与其南、北两侧大陆边缘沉积有明显差异;中特提斯海洋盆地演化经历了早—中侏罗世深海—半深海沉积、晚侏罗世—早白垩世残余海(洋)盆地沉积和晚白垩世残余海盆消亡等3个阶段。Based on the geological survey of 1 ： 250 000 scale in Kana and Ritu Areas, we recognized the vertical and horizontal variation of sedimentation, studied the sedimentary environment and reestablished the Jurassic-Cretaceous sedimentary sequence in three strata areas of western Bangong Lake-Nujiang suture zone. It was specified that the sedimentation in Bangong Lake-Nujiang middle Tethys oceanic basin was clearly different from both the southern and northern continental margin of the ocean in Jurassic-Cretaceous period. The evolution of the middle Tethys Oceanic basin can therefore be divided into three stages as early-middle Jurassic deepwater ocean, later Jurassic to early Cretaceous relict basin with shallow-water sedimentary rocks and later Cretaceous remnant oceanic basin withering away.

关 键 词：中特提斯 盆地演化 侏罗纪-白垩纪 班公湖-怒江结合带 西藏 

分 类 号：P534.5[天文地球—古生物学与地层学]