Inversion of groundwater information from Landsat 8 satellite data in Yingen region and its indications for the exploration of sandstone type uranium deposits
Uranium is of great significance to economy and national defense.Sandstone type uranium deposit is an important type of uranium resource,thus attracts more and more attentions in recent years.Identifying uranium metallogenic environment and condition,and distinguishing the ore-controlling factor are important contents of remote sensing technology in the exploration of sandstone-type uranium deposit.Since uranium mineralization in a sandstone-type uranium deposit is closely related to the interaction between the migrated ore-forming fluid and the ore-bearing wall rock,and groundwater is the most common uranium-bearing fluid,it is of great significance to identify groundwater information using remote sensing technology.Previous studies have shown that Bayingobi basin has good uranium-forming potential,and several areas,such as Tamusu,Benbatu and Yingen,have been proposed as prospects.In this study,the Landsat 8 data covering Yingen area in Inner Mongolia,were collected and used to extract surface temperature,surface vegetation information,and humidity information,respectively by the thermal infrared band combined with atmospheric parameters,the multispectral bands combined with normalized vegetation index(NDVI),and the multispectral bands combined with irregular Trapezoid model(OPTRAM).Because the surface temperature,vegetation growth and surface moisture generally associate with groundwater activity,the inverted results were used to investigate the groundwater information for Yingen area.The results show that the surface vegetation information has a good positive correlation with the groundwater formation in Yingen area,it has been observed that the soil in vegetated areas is generally wet with white salt and alkali,thus the surface vegetation could serve as a primary indicator for identifying groundwater activities.In contrast,surface temperature and humidity information are easily affected by different lithologies,and rock alterations,thus they could only be used as auxiliary indicator for identifying groundwater activities.Based on the surface vegetation,temperature,and humidity information,five NE-trending water-rich belts in south Yingen area were delineated.By integrating the water-rich zones with the results of structural interpretation,the drainage structures and the hidden drainage structures were successfully identified in the southern slope of Yingen area.The drainage structures usually developed close to the water-rich zones that are characterized by high NDVI and humidness but low surface temperature.Combined the identification results with the previous drilling data,the relationship between the drainage structures and the uranium mineralization was recognized.Therefore,it is proposed that the further uranium ore exploration work can be carried out in or around the drainage structures or hidden drainage structures in south Yingen area.
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