Remote Sensing Identification of Metallogenic Factors of Sandstone-Type Uranium Deposit in the Laojunmiao Area,Eastern Junggar Basin
The genesis of sandstone-type uranium deposits in basin margins encompasses various factors,including tectonic slope zone,ample uranium sources,replenishment mechanisms,uranium-carrying groundwater drainage system,and oxidation-reduction transition zone. Advances in remote sensing technology have presented a valuable opportunity for the fast identification of these metallogenic elements,and have promoted the efficient exploration of sandstone-type uranium deposits. Taking the Laojunmiao area in the eastern margin of Junggar Basin as an example,this work extracted altered minerals based on GF-5 hyperspectral resolution images,Sentinel-2 images and DEM data to establish three-dimensional terrain. Integrated with aeromagnetic and aerial radioactivity data,the remote sensing identification of metallogenic conditions was conducted for sandstone type uranium ores. The results show that the study area is located in the slope zone of gentle dip along the basin margin,and has a good groundwater replenishment and drainage system. The surface alteration minerals are mainly kaolinite and a small amount of illite,with a banded distribution. The weak variation of aeromagnetic anomalies indicates that the study area is in an oxidation-reduction transition zone. Integrated remote sensing,aeromagnetic,aerial radioactivity and uranium anomaly information has identified the metallogenic elements related to the formation of sandstone type uranium deposits,such as uranium source,supplement-diameter drainage system and altered minerals,which will provide reference significance for prospecting around the basin.
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