The Research And Application On Geophysical And Geochemical Methods For Prospecting Hidden Sandstone-Type Uranium Ore

This item has studied the applications of the measure of natural thermoluminescence of soil, natural voltage and geogas, whose penetrating power are better, in the exploration of leachable sandstone uranium deposit. It has reviewed the history, analyzed the situation of application in prospecting sandstone-type uranium deposit, and summarized the fundamental principles of these measure. It has studied the key technological problems of these methods more careful work-out. In natural thermoluminescence of soil respect, it has determined the stratgraphy of sampling, and proved anomaly shape has little change with the sampling density. The research shows that the radiation curves of thermoluminescence are different in different geochemical landscape. The direct problems of different shape of ore body have been did. In natural voltage respect, it has tested the stable property of the equipment, and showed the equipment of making by ourselves has good stable property. It has studied the theory of natural voltage measure. In geogas respect, reasonable absorbing substance has been selected through the testing. The effect of the model testing shows that it is impossible for us to prospect sandstone -type uranium deposit. These methods were used on 1328 measure spots in Zhajishitan (511), Kujieertai (512), Shihontan and Bayintala. The results show that thermoluminescent anomalies, whose two edges are higher and the middle is lower, indicate the uranium deposit, the rapidity step of natural voltage indicates the transitive section of oxidation-reduction. The geogas anomalies of U, Mo, V appear above the deposit or boundary of the deposit.It summarized the comprehensive geophysical and chemical prospecting information model of interlayer oxodatipn zone sandstone-type uranium deposit. That is, the thermoluminescent anomalies, whose two ends are higher and the middle is lower, the rapidity step of natural voltage and the geogas anomalies of U indicate the uranium deposit.It is the first time that these methods were used in the exploration of leachable sandstone uranium deposit so many aspects of these methods need to research farther.