氡气及CSAMT联合探测在内蒙古五十家子盆地铀矿勘查中的应用研究

doi:10.11720/wtyht.2019.0018

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Abstract

The uranium mineralization in the Wushijiazi volcanic basin enjoys a superior geological conditions. The uranium mineralization anomalies have been found on the surface, and they are of altered and fractured zone type. To identify the extension changes of ore-controlling fracture along the strike and dip as well as the favorable enrichment of uranium orebody, the authors carried out deep exploration. The joint detection of radon gas and CSAMT (Controlled Source Audiofrequency Magnetotelluric) was adopted in the study area where uranium mineralization is densely concentrated. The major structure and characteristics of ore-controlling fracture were identified, and six uranium mineralization favorable places were predicted, among which two places were drilled to verify, and industrial uranium orebodies were found in these two places. It is shown that the joint detection of radon gas and CSAMT is significantly effective in the search for concealed faults and fractures and blind orebodies; it can be adopted in the prospecting work of the uranium deposit with a major ore-controlling factor of fault structure, and can provide the future uranium deposit prospecting work with some ideas and directions, so as to accelerate uranium deposit prospecting work.

Key words： radon gas measurement CSAMT measurement Wushijiazi uranium exploration

Received: 12 January 2019 Published: 15 August 2019

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	Articles by authors
	Yan-Qing WU
	Shi-Chen WANG
	Yuan DIN
	Qing WANG
	Wen-Zheng WANG

Cite this article:

Yan-Qing WU,Shi-Chen WANG,Yuan DIN, et al. Application study of radon gas and CSAMT joint detection in the uranium exploration in the Wushijiazi Basin of Inner Mongolia[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 726-733.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0018 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/726

Geological sketch of Wushijiazi basin
1—middle and upper Jurassic volcaniclastic rocks and tuffaceous sandy conglomerate; 2—middle and upper permian metamorphic rocks; 3—ggranite-porphyry; 4—granite; 5—volcanics; 6—metamorphic rocks; 7—geological boundaries; 8—fracture structur; 9—uranium ore spot; 10—uranium anomaly occurrences; 11—scope of key work areas

Electrical resistivity characteristic of rocks
1—tuffaceous sandy conglomerate; 2—crystalline tuff; 3—alteration of tuffaceous sandy conglomerate

The curve of radon gas measurement time and depth test
a—experimental curve of measuring time;b—air-bleed depth experiment curve

L2 Line geological-geophysical exploration results
a—radon concentration curve;b—resistivity profile;c—map of geological inference results;1—Middle Jurassic Xinmin formation;2—interpretation of fault structures;3—that the weathering of rock surface;4—prediction of favourable metallogenic areas;5—economic uranium orebody;6—uranium mineralized body

L3 Line geological-geophysical exploration results
a—radon concentration curve;b—resistivity profile;c—map of geological inference results;1—mddle Jurassic Xinmin formation;2—interpretation of fault structures;3—the weathering of rock surface;4—prediction of favourable metallogenic areas;5—economic uranium orebody;6—uranium mineralized body

Comprehensive results of the key working areas of the Wushijiazi basin
1—Quaternary;2—upper Jurassic Manketou Obo Formation middle Jurassic Xinmin formation;3—middle Jurassic Xinmin formation;4—geological boundary;5—unconformity contact boundary;6—measured fracture structure;7—interpretation of fault structures;8—uranium mine points and numbers;9—location and number of radon and CSAMT comprehensive profiles;10—location and number of boreholes in uranium industry

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