Discussion about origin of the Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia
Yang Fan1, 2, Li Xiaoze1
1 Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,Gansu; 2 University of Chinese Academy of Science,Beijing 100049
Abstract：The Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia provide great potential for understanding paleo-environment of the Paleogene inland in China. Based on the lithology,sedimentary structures,surface features of quartz grains and grain size distribution,the orgin of these red sandstones are intensively discussed. This study indicates that the Paleogene Sikouzi Formation sandstones are with a combination of three kinds of sedimentary members: The Member Ⅰ of Sikouzi Formation is fluvial sediments; the Member Ⅱ of Sikouzi Formation,as the main part of the sandstones,belongs to the typical eolian sandstones,and it can be inferred that the sedimentary environment is eolian sand dunes and interdunal depression;the Member Ⅲ of Sikouzi Formation is judged to be lacustrine sediments preliminarily. Combined with the palaeoclimate,orographic condition of the study area and palaeowind, the eolian deposits,as the main part of the Sikouzi Formation sandstones,can be deduced to develop in desert environment controlled by the planetary-wind system.
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