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| The application of comprehensive geophysical prospecting method to the exploration of the volcanic rock type uranium deposits in Wuliying area |
| MENG Fan-Xing1, 2, HE Hai-Yang1, 2, LIANG Yong-Shun1, 2, CHEN Peng1, 2, WU Xu-Liang1, 2, SHAN Ya1, 2 |
1.Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;
2.CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource,Shijiazhuang 050002,China |
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Abstract Volcanic rock type uranium deposits could be generated in volcanic rock body and also from shallow metamorphic rock and volcanic rock mass near the lower Palaeozoic strata in the Mesozoic continental glutenite, so the detection of the development situation of related volcanic rock body is of great significance for the further development of uranium exploration work. This paper briefly introduces the controlled source audio-frequency magnetotelluric (CSAMT) measurement and the work method of high precision magnetic survey and ground in the five camps in practical application. Combined with the geological data and petrophysical characteristics, the authors used CSAMT survey data, found out the general andesitic porphyrite and thick deep development characteristics of the porphyry, and made use of the ground high-precision magnetic survey data, thus improving the recognition reliability of the contact zone of rock mass and fracture structure inference. Drilling verification shows that the effect is good. Comprehensive analysis shows that CSAMT survey has better vertical resolution, and can accurately detect the deep development of rock mass characteristics, the location of the fracture development and the deep situation; the contoured ground high-precision magnetic survey can roughly delineate rock mass, and identify the contact zone of rock mass as well as the fracture. The two methods together can more comprehensively solve geological problems and provide effective technical means for volcanic type uranium deposit exploration.
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Received: 28 July 2016
Published: 20 October 2017
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