| 1 | Base level change and depositional filling response of Jurassic in the Qiangtang Basin of Tibet显示文摘The base level during the deposition of Jurassic in the Qiangtang Basin shows a complete cycle from rising to falling. The base level change is closely connected with tectonic evolution of the basin,especially connected with Bangonghu-Nujiang ocean evolution process in the formation and evolution of the basin. It is also affected by climate. The Jurassic strata correspond to a long-term base level cycle sequence. The sequence is in fact a non-complete symmetrical cycle,consisting of rising hemicycle and falling hemicycle. It can be divided into 6 intermediate-term base level cycle sequences,including 2 carbonate sequences,3 mixture sedimentary sequences of carbonate and clastic rocks and one clastic sedimentary sequence. Depositional filling characteristics during base level change show that Bangonghu-Nujiang ocean spreads in Toarcian-Bajocian ages,and is at the height of spreading of Bangonghu-Nujiang ocean in Bathonian-Oxfordian ages. In that process,sea area became smaller because of the dry climate. Eventually,marine depositional filling is ended with the subduction and collision of Bangonghu-Nujiang ocean. | ZHANG ShangFeng1,2,ZHANG ChangMin1,HU MingYi1,GONG WenPing1,XIAO ChuanTao1,LIU AiHua1 & Lü Dong11 Remaining Resources Research Group of Geoscience College,Yangtze University,Jingzhou 434023,China 2 Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education of China,Yangtze University,Jingzhou 434023,China | 2009 | Science China Earth Sciences2009，52，S1： | 2 |
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