Sedimentary Characteristics and Uranium Prospecting Potential of Upper Member of Lower Cretaceous Tugulu Group in Huanghuagou Area,Junggar Basin
The Huanghuagou area is located in the northern part of the Ulungu depression in the Junggar Basin.With the investment of uranium exploration in recent years,the interlayer oxidation zone type uranium mineralization was found in the braided channel sand body of braided river delta plain,which originated in the upper part of Tugulu Group of the Lower Cretaceous.In order to understand the sedimentary characteristics and uranium mineralization potential of the upper member of Tuguru Group,a large number of borehole cores,outcrops and correlation of profiles was studied.The results show that braided river delta plain subfacies are mainly developed in the upper part of Tuguru Group,with good sand body connectivity and large thickness,which provides a prerequisite for runoff from the self-erosion source area of uranium-containing oxygenated water to the basin.The interlayer oxidation zone develops from NW to SE and is obviously controlled by lithology and lithofacies.The uranium mineralization is exposed mainly in the wings of the oxidation zone,indicating that REDOX reaction is the main controlling factor for uranium precipitation and enrichment in this area.In the upper part of Tuguru Group,the sand body has the defects of low epigenetic oxidation degree and low reduction capacity,which is unfavorable to uranium mineralization,but there is still the possibility of forming a small uranium deposit in the area of local enrichment of organic matter.It is concluded that the future uranium exploration in this area should pay attention to the distribution characteristics of organic matter.
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