
Early Cretaceous dynamic evolution of paleo-landscape and eastward migration of Jehol Biota in North China
Shuangshuang SONG, Yanhui SUO, Sanzhong LI, Xuesong DING, Xu HAN, Zihan TIAN, Xinjian FU
Early Cretaceous dynamic evolution of paleo-landscape and eastward migration of Jehol Biota in North China
It is suggested that the spatio-temporal evolution of the Jehol Biota in northeastern North China is driven by the North China Craton destruction during the Early Cretaceous,due to the abrupt changes in paleogeographic environment. However,little quantitative work on the dynamic paleo-landscape evolution in North China has been done. In this study,we employed paleosoil weathering indices(PWI and CFXNa)and carbonate isotopes to reconstruct the paleo-elevation of North China around 145 ma. We then integrated factors such as tectonic movements,sedimentology,paleoclimate,and sea level changes using the Badlands software to model the Early Cretaceous paleo-landscape evolution of North China. Our findings reveal that the eastern North China experienced an abrupt geomorphological transition from the collapse of a paleo-plateau to the formation of the Bohai Bay Basin due to the subduction retreat of the paleo-Pacific Plate. The geomorphological transitions led to the formation of a series of eastward-migrating rifted basins,including several newly-formed isolated intermountain basins in the Yanshan area where the Jehol Biota first emerged. Frequent volcanic activity provides rich nutrients for the lakes,and the paleoclimate turns to warm and humid gradually,which provide favorable conditions for the prosperity of the Jehol Biota. The eastward migrating subsidence basin,eruption of volcanoes and suitable paleoclimate jointly controlled the eastward migration of the Jehol Biota.
North China Craton / Early Cretaceous paleo-landscape / Jehol Biota / subsidence basin
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