鄂尔多斯盆地塔然高勒铀矿床矿体产出特征及其对成矿作用的指示OA

[Objective]The northeastern margin of Ordos is an important sandstone-type uranium deposit area in China,and the Tarangaole deposit is a representative one.Analyzing the orebody morphology and formation mechanism of this deposit can further our understanding of the metallogenic regularity and mechanism of sandstone-type uranium deposits.[Methods]This paper uses sedimentology,petrology,mineralogy and other methods.Through the statistics of the thickness,burial depth,elevation and burial depth of the ore-bearing target layer and the ore-controlling factors of the Tarangaole deposit,various diagrams revealing the mor-phological characteristics of the orebody were drawn.[Results]The results show that the elevation of the reservoir in the Taran-gaole deposit is high in the northeast and low in the southwest.The thickest part of the orebody is generally located in the transition zone between the rapid and gentle parts of the reservoir elevation change.The orebody is tabular and occurs along the bedding in the contact zone between the carbonaceous and pyrite-rich gray sandstone and the gray-green sandstone.Vertically,the intensity of the gamma-ray logging anomaly gradually weakens from top to bottom.Horizontally,along the flow direction of the oxygen-rich and uranium-rich fluid,the thickness of the orebody first increases and then decreases,with a relatively obvious metallogenic center zone.[Conclusion]The position and morphology of the Tarangaole orebody are mainly constrained by the gray sandstone rich in re-ducing medium.The maximum thickness of the orebody in the metallogenic center zone is related not only to the continuous metal-logenic process in the later stage,but also to a certain extent to the change of the reservoir elevation.