砂岩型铀矿局部排泄带遥感识别与应用

The Remote Sensing Identification of Local Discharge Belt and Its Application in the Exploration of Sandstone Type Uranium Deposit

识别局部排泄带对分析盆地水动力循环系统和可地浸砂岩铀矿的补给-径流-排泄条件具有重要意义。传统的局部排泄带遥感识别技术认为构造排泄区土壤湿度较大,通过遥感数据湿度指数计算来识别局部排泄带。文章分析了塔木素铀矿床局部排泄带和遥感特征之间关系,结合地下水排泄理论,认为在中国北方干旱盆地内,由于蒸发蒸腾作用强烈,局部排泄带在地表可能并没有水体出露,而与主断裂构造走向一致的线型盐渍带,有可能是局部排泄带的指示证据。以此为依据建立了盆地内局部排泄带的遥感识别方法,并在甘肃乱井地区进行了实验,成功识别了该区内的局部排泄带。

The identification of the local discharge belt is of great significance to the analysis of the groundwater cycle system and hydraulic zone of the supply-runoff-drainage for the exploration of sandstone uranium deposits.The traditional remote sensing technique for the identification of local discharge belt believe that high soil moisture will occurs due to groundwater seepage,which can be identified by calculating the humidity index of remote sensing data.In this paper,the relationship between the local discharge belt and remote sensing characteristics of known sandstone-type uranium deposits(Tamusu uranium deposit)was analyzed.Combined with the hydrogeology,it is believed that the local discharge belt may not exposed as the high humid in the soil to water because of strong evaporation and transpiration in arid basins,however linear salinized belt may distribute along the fault structure which cause the local discharge of underground water.A remote sensing method for the identification of local discharge belt was established and tested in the Luanjing area of Gansu province.As a result,a local discharge belts was successfully identified by the method.