Base level change and depositional filling response of Jurassic in the Qiangtang Basin of Tibet |
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Authors: | ShangFeng Zhang ChangMin Zhang MingYi Hu WenPing Gong ChuanTao Xiao AiHua Liu Dong Lü |
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Institution: | 1.Remaining Resources Research Group of Geoscience College,Yangtze University,Jingzhou,China;2.Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education of China,Yangtze University,Jingzhou,China |
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Abstract: | 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. |
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