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Provenance of Late Mesozoic Strata and Tectonic Implications for the southwestern ordos basin,North China:Evidence from Detrital Zircon U-Pb Geochronology and Hf Isotopes

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Journal of Earth Science 2022年第2期33卷 373-394页

作者： Zuoqiang Li Fengjie Li Zheng'an Chen Xuelian Lai Xiaokang Ma State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China 207 Geological Brigade of Sichuan Bureau of Exploration&Development of Geology&Mineral Resources Leshan 614000China

In order to determine the provenance and variation characteristics of sandstone-type uranium deposits located in the southwest ordos basin,U-Pb geochronology and Hf isotope analyses were conducted on detrital zircons from the Late Mesozoic strata of the SD01 well in the Zhenyuan *** detrital zircon U-Pb ages of four samples exhibited four main peaks at 250–330,420–500,1720–2000,and 2340–2580 Ma,with a small number of zircons dated at 770–1100 *** detrital zircon age spectrum and further restriction provided by the in-situ Hf isotopic data suggest that the provenance of each stratum was mainly derived from the crystalline basement rock series(Khondalites,intermediate-acidic intrusive rocks,and metamorphic rocks)of the Alxa Block to the northwest and the Yinshan Block to the north,with minor amounts of Caledonian magmatic rocks and Jingning Period rocks from the western part of the northern Qilian orogenic belt to the west and the northern Qinling orogenic belt to the *** provenance of the sandbody has not changed significantly and is of the Middle Jurassic–Early *** clear variations in the zircon ages of the samples from the Zhiluo and Anding formations were likely influenced by climate change during the Middle–Late *** Triassic zircon age(basin sediments.

关键词： southwestern ordos basin provenance analysis Late Mesozoic detrital zircon U-Pb geochronology Hf isotopes geochemistry

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Characteristics of Uranium Mineralization in Red Clastic Formations in the southwestern Margin of the ordos basin

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1471-1487页

作者： ZHANG Zilong HE Feng YI Longsheng FAN Honghai CAI Yuqi LIU Hongxu LIU Xinyang CHEN Hongbin JIA Cui YANG Mengjia Key Laboratory of Uranium Resource Exploration and Evaluation Technology(CNNC) Beijing Research Institute of Uranium GeologyBeijing 100029China China National Uranium Corp. Beijing 100013China No.203 Research Institute of CNNC XianyangShaanxi 712000China

In the southwestern margin of the ordos basin,uranium mineralization is primarily hosted by predominantly oxidative red clastic formations in the Lower *** main target layers for uranium exploration are the Madongshan and Liwaxia formations of the Liupanshan Group,followed by the Jingchuan Formation of the Zhidan *** host rocks(medium-fine feldspar quartz sandstone),which are bleached to a light grayish white color,contain a minor organic matter component and *** mineralization changes from surficial infiltration or phreatic oxidation in the upper part to interlayer oxidation in the lower *** ore bodies are mostly lenticular or tabular in shape,locally shaped like crescent *** ore bodies are typically small and *** predominantly manifests as pitchblende and *** is usually short and columnar or granular in habit,whereas pitchblende occurs as an irregular colloidal covering on the surface or in fissures of ferric oxide,silicate,clay or *** uranium minerals are torbernite,uranophane,and *** associated with uranium are mainly pyrite,chalcopyrite and,to a minor extent,arsenopyrite and *** associated elements are Mo,V,Se,Co,Ni,and Mn,the host sandstone being high in Cu and ***,the red clastic formations in the southwestern margin of the ordos basin are characterized by’five multiples but one low’which means multiple target layers,multiple stages of mineralization,multiple ore body shapes,multiple kinds of uranium minerals,multiple associated elements,but low organic *** implies an overall complex uranium metallogenic environment and mineralization *** is recommended that future uranium exploration should take into consideration regional metallogenic conditions and mineralization features,with target layers in the wide-smooth synclinal slope being focused *** uranium deposits are small to medium in size,and the main type of urani

关键词： red clastic formation uranium mineralization Lower Cretaceous southwestern ordos basin

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