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| Paleoclimate evolution and its influence on lake level changes of Paleogene Dongying epoch in Liaodong Bay, East China |
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WU Wei1,2,LIN Chang-song3,ZHOU Xin-huai4,LI Quan3,XING Zuo-chang1,YAN Yu1
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(1.Institute of Resources & Environment, Henan Polytechnic University,Jiaozuo 454003，China ;2.Key Laboratory of Biology Trace and Mining Process of Henan Province，Jiaozuo 454003，China ;3. School of Ocean Sciences，China University of Geosciences, Beijing 100083，China ;4.Tianjin Branch Company of China National Offshore Petroleum Corporation, Tianjin 300452, China)
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| Abstract: |
| According to the adaptability of vegetation to climate including temperature and humidity，the paleoclimate evolution and its influence on lake level changes of Paleogene Dongying epoch in Liaodong Bay were researched based on the division of the pollen climate types and the comprehensive analysis of the level of pollen，and the relative ratio of different climate type pollen in study areas. The results show that the whole climate in Dongying epoch transforms from relative dry-warm to relative wet-cold gradually. Climate change is characterized by significant cycle and can be divided into five cycles, which agrees well with the four-order sequence boundary of previous studies. With the tectonic subsidence and lake level change history ，it is found that the climate controls the high-frequency lake level fluctuations when tectonic subsidence is stable. At the same time, the climate also indirectly controls the four-order sequence boundary, and the dry-warm climate is favorable for the formation of basin floor fan. |
| Key words: paleoclimate lake level change Oligocene Dongying epoch Liaodong Bay |
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