Palaeogeomorphic restoring of the Jurassic Zhiluo Formation and its effect on uranium mineralization in Binxian area,southern Ordos Basin
He Feng1,2, Zhang Zilong1,2, Liu Hongxu1,2, Li Ping1,2, Li Yafeng3
1 CNNC Beijing Research Institute of Uranium Geology,Beijing 100029; 2 CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology,Beijing 100029,Beijing; 3 No.203 Research Institute in Nuclear Industry,Xianyang 712000,Shaanxi
Abstract：Taking the Lower Member of Jurassic Zhiluo Formation of Binxian area in southern Ordos Basin as research objects,the palaeogeomorphology of each period by using the method of layer flattening were restored accurately and the palaeogeomorphological units were divided. The evolution characteristics of the space of the uranium reservoir were revealed and the flow direction of groundwater in different periods were defined. The controlling effects by the characteristics of palaeogeomorphology on interlayer oxidation zone were discussed. Braided channel sandbodies are the favorable reservoir sand in which the uranium ore bodies mainly occur,controlled by the palaeogeomorphology and mainly developed in the incised valley. Palaeogeomorphology controls the ancient underground water flow and the development of interlayer oxidation zone and uranium mineralization. On the preconcentration stage of uranium in the Late Jurassic,the uplift in northern Binxian,easy to be leached and oxidized,is not conducible to the enrichment of uranium. At the main metallogenic stage in the Early Cretaceous-Paleocene,the palaeotopography of southeast is higher than that in northwest,which leads water bearing oxygen and uranium to flow the braided river sandbodies in fan-shape northwestward,so the palaeo-interlamination oxidized zone and uranium mineralization were formed. Restoring palaeogeomorphology has an important guide to study the distribution of the uranium sandbodies and regularity of uranium ore formation.
He Feng,Zhang Zilong,Liu Hongxu et al. Palaeogeomorphic restoring of the Jurassic Zhiluo Formation and its effect on uranium mineralization in Binxian area,southern Ordos Basin[J]. JOPC, 2017, 19(4): 692-702.
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