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Geological characteristics and metallogenic mechanism of Lower Cretaceous uranium mineralization in northern Ordos basin
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Guo WANG, Bo LIU, Yiming BAI, Longhui WANG, Huaming LI, Shuaishuai LU
World Nuclear Geoscience | 2025, 42(3) : 485 - 503
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World Nuclear Geoscience | 2025, 42(3): 485-503
• INVITED PAPER •
Geological characteristics and metallogenic mechanism of Lower Cretaceous uranium mineralization in northern Ordos basin
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Guo WANG, Bo LIU, Yiming BAI, Longhui WANG, Huaming LI, Shuaishuai LU
Affiliations
  • Geologic Party No. 208，CNNC，Baotou 014000，China
Published: 2025-06-08 doi: 10.3969/j.issn.1672-0636.2025.03.002
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The Ordos basin is the second largest energy basins in China，and several large uranium ore deposits have been discovered. The upper member of Lower Cretaceous Huanhe formation in the basin is the main prospecting horizon. In this paper，the uranium mineralization characteristics and metallogenic mechanism of Lower Cretaceous Huanhe formation in northern Ordos basin are studied by means of geological characteristics，altered mineral association，rock geochemistry and the metallogenic model is established. The three superimposed system domains of Lower Cretaceous Huanhe formation formed a fine-coarse-fine stratigraphic structure，which provided a foundation for the migration of uranium ore-forming fluids in the later period. In the early stage of mineralization，the scale of the oxidation zone was limited，and the main alteration minerals were hematite，limonite，pyrite，chalcopyrite，sphalerite，calcite and coffinite，etc. The metallogenic environment were of strong reducing capacity，the ore-forming fluid were strongly alkaline，and intense water-rock interaction occured. In the middle and late stage of mineralization，the oxidation zone advanced into the basin，a strong REDOX reaction developed ，the primary ore zone and reduction zone were formed，and the metallogenic environment maintained the early strong reducibility. The main altered minerals in this period were hematite，limonite，pyrite，montmorillonite，chlorite and uranite. With the mixing of ore-forming fluids，ore-forming fluids gradually turn to weak alkaline，uranyl silicate ions decomposed，and a large amount of uranite was formed.

Lower Cretaceous Huanhe formation  /  altered mineral association  /  ore-forming fluid  /  ore-forming model  /  northern Ordos basin
Guo WANG, Bo LIU, Yiming BAI, Longhui WANG, Huaming LI, Shuaishuai LU. Geological characteristics and metallogenic mechanism of Lower Cretaceous uranium mineralization in northern Ordos basin[J]. World Nuclear Geoscience, 2025 , 42 (3) : 485 -503 . DOI: 10.3969/j.issn.1672-0636.2025.03.002
Funding
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  • China Nuclear Geology Bureau Project “Investigation，Evaluation and Exploration of Uranium Resources in EtuoKe QianQi-Dongsheng Area，Northern Ordos Basin”(202201)
  • Inner Mongolia Autonomous Region “Grassland Talents”project “Uranium resource mineralization theory innovation in the north of Ordos basin and the improvement of resource support capacity of large uranium mine base”；the Inner Mongolia Research Institute of Engineering Science and Technology Development Strategy project “Inner Mongolia Uranium Mine Resource Support Capacity”(2024NMYB-07)
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Year 2025 volume 42 Issue 3
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Article Info
doi: 10.3969/j.issn.1672-0636.2025.03.002
  • Receive Date：2024-12-02
  • Online Date：2025-11-10
  • Published：2025-06-08
Article Data
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History
  • Received：2024-12-02
  • Revised：2025-04-11
Funding
China Nuclear Geology Bureau Project “Investigation，Evaluation and Exploration of Uranium Resources in EtuoKe QianQi-Dongsheng Area，Northern Ordos Basin”(202201)
Inner Mongolia Autonomous Region “Grassland Talents”project “Uranium resource mineralization theory innovation in the north of Ordos basin and the improvement of resource support capacity of large uranium mine base”；the Inner Mongolia Research Institute of Engineering Science and Technology Development Strategy project “Inner Mongolia Uranium Mine Resource Support Capacity”(2024NMYB-07)
Affiliations
    Geologic Party No. 208，CNNC，Baotou 014000，China

Corresponding:

LIU Bo，male，born in 1984，senior engineer，PhD，focusing on uranium exploration and research of deposits. E-mail：
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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