New scheme for subdivision and age determination of the Lower Cretaceous of Beishan area near Gansu-Inner Mongolia border,China
ZHANG Mingzhen1, LIU Guolong1, DAI Shuang2, CHEN Shiqiaing3, LI Aijing2, JIAO-BA Dunzhu1, ZHANG Jing2, LIN Shaohua2
1 Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China; 2 School of Earth Sciences,Lanzhou University,Lanzhou 730000, China; 3 Fourth Institute of Geological and Mineral Exploration of Gansu Provinical Bureau of Geology and Mineral Resourses,Gansu Jiuquan 735000,China
Abstract：Many small inland sedimentary basins,rich in coal,uranium,hydrocarbon and others, developed during the Early Cretaceous in Beishan area at the Gansu and Inner Mongolia border area. However,the chaotic subdivision of lithological stratigraphic systems and unclear age determination have seriously hindered resource exploration in recent years. Based on the stratigraphical and palynological data collected from boreholes and outcrop sections,the Lower Cretaceous Laoshuwo Group of this area was divided into three formations in an ascending order,including the Tuomatan Formation,the Tianshuijing Formation(a new name)and the Mazongshan Formation(a new name). The former two formations are probably in an unconformity contact. The Tuomatan Formation is mainly composed of dark gray,dark gray-green coal-bearing mudstone,siltstone and coarse sandstone,containing Aequitriradites that are common in the early Early Cretaceous. Cicatricosisporites that are more common in middle Early Cretaceous are rare in the Tuomatan Formation indicating the age of this formation is the earliest Early Cretaceous(probably late Berriasian to early Valanginian). The Tianshuijing Formation is characterized by gray-green fine-grained mudstone and siltstone,and rich in Ephedripites and Cicatricosisporites,indicating an age of middle Early Cretaceous(probably Hauterivian-Barremian). The Mazongshan Formation is characterized by purple-red,light-gray fine-grained siltstone,in which a few tricolpate pollen records of early angiosperms indicate a late Early Cretaceous age(probably Aptian-Albian). This new stratigraphic system in the Beishan area at the Gansu and Inner Mongolia border area will provide reference for later resource exploration and basic research.
ZHANG Mingzhen,LIU Guolong,DAI Shuang et al. New scheme for subdivision and age determination of the Lower Cretaceous of Beishan area near Gansu-Inner Mongolia border,China[J]. JOPC, 2023, 25(2): 497-510.
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