Sedimentology，palaeogeography and palaeoecology of the Late Jurassic-Early Cretaceous eolian sands in North China
Xu Huan1 Liu Yongqing1 Kuang Hongwei1 Liu Yanxue1 Peng Nan1，2 Dong Chao1，3Xue Peilin1，4 Xu Jialin1，4 Chen Jun1，2 Liu Hai1，3
1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037; 2 School of the Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083; 3 School of Earth Physical and Oil Resources, Yangtze University, Jingzhou 434023, Hubei; 4 School of Earth Sciences, Yangtze University, Jingzhou 434023, Hubei
Abstract The Late Jurassic-Early Cretaceous eolian sand deposits in North China were mainly developed in the Upper Jurassic Santai Formation of Mengyin Basin in western Shandong Province，Upper Jurassic-Lower Cretaceous Tuchengzi Formation of Jin-Yang Basin in western Liaoning Province，Upper Jurassic-Lower Cretaceous Tuchengzi/Houcheng Formation of Shangyi Basin in northwestern Hebei Province，Lower Cretaceous Zhidan Group in Erdos Basin and Lower Cretaceous Hekou Group in Gansu Province.These eolian sandstones in different areas were all characterized by high dipping large-giant tabular or wedge-shaped cross-beddings and parallel beddings，well sorting and subangular-subround shape.The formation age of the eolian sandstones in the above 5 areas can be divided into three phases，that is，Kimmeridgian-Berrisian，Valanginian-Hauterivian and Hauterivian-Aptian, and shows an younger ages westward from western Shandong Province to Gansu Province.The further researches of palaeowind direction and palaeomagnetism on eolian sandstones found that the northwestward wind was prevailed during the Late Jurassic-Early Cretaceous，while the eolian sandstones were distributed in the area of N25°-N45° which belonged to the westerlies.Compared with the eolian sandstones distribution at the same period in the southern hemisphere，the authors pointed out that mid latitude zones in both hemispheres lied in westerlies which was controlled by planetary wind system.During the Late Jurassic-Early Cretaceous，it was dry and cold in the area above N30° of North China， and dry and hot in the rest region of North China.It lied in a high altitude mountainous environment with some intermountane basins and frequent volcanic eruptions in northern North China.Succession of Yanliao Biota and Jehol Biota was coupling with the eolian sand deposition, which indicates that the palaeogeography and palaeoenvironment might have an effect on the evolution of the biota.
About author: Xu Huan，born in 1987，is a master degree candidate of Institute of Geology，Chinese Academy of Geological Sciences，and is mainly engaged in sedimentary geology and basin analysis.E-mail: xuhuan0816@126.com. About the corresponding author Liu Yongqing，born in 1960，is a research professor of sedimentology，palaeogeology and palaeoecology at Institute of Geology，Chinese Academy of Geological Sciences.E-mail:liuyongqing@cags.ac.cn.
Cite this article:
Xu Huan,Liu Yongqing,Kuang Hongwei et al. Sedimentology，palaeogeography and palaeoecology of the Late Jurassic-Early Cretaceous eolian sands in North China[J]. JOURNAL OF PALAEOGEOGRAPHY, 2013, 15(1): 11-30.
Xu Huan,Liu Yongqing,Kuang Hongwei et al. Sedimentology，palaeogeography and palaeoecology of the Late Jurassic-Early Cretaceous eolian sands in North China[J]. JOPC, 2013, 15(1): 11-30.
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