Cretaceous sedimentary succession of eolian sandstones in Zhangye Region of Gansu Province:Sedimentological response to the Cretaceous uplift of Qilian Mountains
Mei Mingxiang1,Su Dechen2
1 School of Earth Sciences and Resources，China University of Geosciences（Beijing），Beijing 100083; 2 State Key Laboratory of Continental Structure and Dynamics，Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037
Abstract Studies on the uplift process of the Qilian Mountains and its sedimentological response are meaningful for the further understanding of the formation of the Tibetan Plateau and its impact of environment in Asia. The Lower Cretaceous in the Zhangye Region of Gansu Province, which is genetically controlled by the uplift process of the Qilian Mountains，can be subdivided into the Chijinpu， Xiagou and Zhonggou Formations. Their sedimentary features can be summarized as follows:（1）a course clastic rock succession can reflect the phenomenon of “rain shadow effect”，i e.,the Chijinpu Formation with the restricted distribution in space and the thickness of more than 1000 meters，which is made up of the cyclic succession of sedimentary facies characterized by the “alluvial fan（or fluvial fan-braided river-eolian sand dune of the lake shore facies”;（2）a set of red beds that is composed of more eolian sand dunes of the lake shore facies in the margin areas of the basin，i e., the Xiagou Formation，which probably represents the product of a more obvious period of the “rain shadow effect”that is correspond to the rapid and strong uplift process of the Qilian Mountains;（3）a succession from the alluvial system to the lake system with the more widespread spatial distribution，i e., the Zhonggou Formation， which belongs to the product formed in moist climate setting without the rain shadow effect and is genetically related to the equilibrium uplift of the Qilian Mountains;（4）The generally absence of the Upper Cretaceous in the study area is probably genetic related to the unloading of Qilian Mountains that leads to the isostasy rebounding in front of mountains. Therefore，a particularly sedimentary succession with the development of eolian sandstones from the Chijinpu Formation to the Xiagou Formation in the study area，which is characteristic of a sedimentary succession of both a composition of special sedimentary facies and their evolutionary succession，not only becomes an important substance record for the further understanding of the Cretaceous uplift of the Qilian Mountains, but also provides another important record for the reconstruction of the atmospheric circle pattern in the East Asia.
About author: Mei Mingxiang，born in 1965，graduated from China University of Geosciences（Beijing） and obtained his Ph D. degree in 1993. Now he is a professor at School of Earth Sciences and Resources， China University of Geosciences（Beijing），and is engaged in sedimentology.
Cite this article:
Mei Mingxiang,Su Dechen. Cretaceous sedimentary succession of eolian sandstones in Zhangye Region of Gansu Province:Sedimentological response to the Cretaceous uplift of Qilian Mountains[J]. JOPC, 2014, 16(2): 143-156.
Mei Mingxiang,Su Dechen. Cretaceous sedimentary succession of eolian sandstones in Zhangye Region of Gansu Province:Sedimentological response to the Cretaceous uplift of Qilian Mountains[J]. JOPC, 2014, 16(2): 143-156.
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