The Fluid Dynamic Processes Characteristics And Its Uranium Mineralization Of Sandstone Type In The Shawafuqi Basin,China

The Tianshan-Jungar uranium province is one of the five largest uranium mineralization provinces in China.In recent years,surveys of sandstone-type uranium deposits have progressed significantly compared to other types of uranium deposits.The fluid dynamics and uranium mineralization during the formation and evolution of basins are the basis for energy minerals,and therefore they are also receiving much attention.The Sawafuqi Basin,where the Sawafuqi sandstone-type uranium deposit is situated,is located in the northern margin of the Tarim Basin,in the southern part of the western Tianshan Mountains,and is in the uranium province of Tianshan-Jungar.The uranium mineralization of the deposit is dominated by the sandstone type,and the main uranium-producing layer is the II-4 and II-5 uranium mineralization in the Tirmilsu Formation of the Kerasure Group in the Middle-Lower Jurassic.Uranium mineralization is strictly controlled by factors such as lithology-facies,the development of interlayer oxidation zone,epigenetic oxidation leaching,and tectonic movement.Relevant studies believe that the ore area has superior geological conditions for mineralization and a good prospect for prospecting.The exploration of fluid migration patterns in the basin will help to further understand the source of oreforming materials in uranium deposits and determine the causes of mineralization in the corresponding horizons,thereby exploring effective prospecting methods for sandstone-type uranium deposits and further promoting uranium exploration and mining work.In this paper,Basin2 TM software is used to numerically simulate the temperature field,pressure field,flow direction,flow rate,and geothermal gradient of the fluid in the structure-sedimentation process of the Sawafuqi Basin.The overall fluid flow pattern migrates from the deep basin to the northern margin and upper part of the basin.In each basin's depositional phase,with the evolution of the basin,the temperature and pressure in the sedimentary body continuously increase,and the flow characteristics of the basin fluid also constantly change.During the late Jurassic period(100 Ma),the direction of fluid flow in the deep basin did not change much,and the fluid velocity decreased.The shallow fluid in the basin appears to flow from the edge of the basin to the center of the basin's sedimentation.At the end of the Cretaceous(65Ma),the basin was further deposited and evolved,and the entire basin still flows from the deep basin to the northern margin of the basin.The fluid flow pattern of the Middle-Lower Formation in the Jurassic is the slow movement from the edge of the basin to the center and the top of the horizon.