Characteristics of Paleo-Interlayer Oxidation Zone and Uranium Metallogenic Model of the Lower Member of Zhiluo Formation in Diantou Area,Ordos Basin
The formation and distribution of uranium mineralization in Diantou area of Ordos Basin are closely related to the paleo-interlayer oxidation zone.With the macroscopic and microscopic petro-mineralogy and petro-geochemistry,this study identified and divided the paleo-interlayer oxidation zone,summarized the spatial distribution characteristics of the paleo-interlayer oxidation zone,and analyzed the formation process of the paleo-interlayer oxidation zone and different metallogenic processes.The results show that the paleo-interlayer oxidation zone developed from southeast to the northwest,and can be divided into oxidation zone,redox transition zone and reduction zone.On the plane,the uranium mineralization is mainly located in the redox transition zone.In the vertical,uranium mineralization occurs at the interface between gray-green and gray sandstone.Additionally,based on the ore-bearing structure-burial evolution,a multistage metallogenic model of sandstone-type uranium deposits in the study area was proposed.It is considered that the subsequent uranium exploration should focus on the main channel and the redox transition zone,especially the superposition of the two is more favorable for the production of thick and large ore bodies.
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