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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摘要

五十家子火山盆地铀成矿地质条件优越,地表已发现大量蚀变裂隙带型铀矿化及异常点,为查明控矿断裂沿走向、倾向延伸变化情况及深部铀矿体有利富集部位,便于开展深部勘查工作。因此在研究区铀矿化密集部位开展了氡气及可控源大地电磁测深联合探测工作方法,大致查明了研究区主控矿断裂构造特征,并预测6处铀成矿有利部位,其中2处铀成矿有利部位经钻探查证,发现较好的工业铀矿体。表明氡气与可控源大地电磁测深联合探测寻找隐伏断裂和盲矿体效果显著,适用于控矿因素以断裂构造为主的铀矿勘查找矿工作,为今后铀矿找矿工作提供思路及方向,以期扩大铀矿找矿成果。

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	吴燕清
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关键词 ：氡气测量, CSAMT测量, 五十家子, 铀矿勘查

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

收稿日期: 2019-01-12 出版日期: 2019-08-15

P631

基金资助:中国核工业地质局铀矿调查评价项目“内蒙古林西县—巴林右旗铀矿资源调查评价”(201824)

作者简介: 吴燕清(1988-),男,工程师,主要从事铀矿资源调查评价及铀成矿理论研究工作。Email: 15847616797@163.com

引用本文:

吴燕清, 王世成, 丁园, 王青, 王文正. 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[J]. 物探与化探, 2019, 43(4): 726-733.
Yan-Qing WU, Shi-Chen WANG, Yuan DIN, Qing WANG, Wen-Zheng WANG. Application study of radon gas and CSAMT joint detection in the uranium exploration in the Wushijiazi Basin of Inner Mongolia. Geophysical and Geochemical Exploration, 2019, 43(4): 726-733.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0018 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/726

Fig.1 五十家子盆地地质略图
1—中、上侏罗统火山碎屑岩、凝灰质砂砾岩;2—中、上二叠统变质岩;3—花岗斑岩;4—花岗岩;5—火山岩;6—变质岩;7—地质界线;8—断裂构造;9—铀矿点;10—铀异常点;11—重点工作区范围

Fig.2 岩石电阻率特征
1—凝灰质砂砾岩;2—晶屑凝灰岩;3—蚀变凝灰质砂砾岩

Fig.3 氡气测量时间及测量深度实验曲线
a—测量时间实验曲线;b—抽气深度实验曲线

Fig.4 L2线地质—物探成果
a—氡浓度曲线;b—电阻率断面;c—地质推断成果;1—中侏罗统新民组;2—解释断裂构造;3—推测岩石风化面;4—预测成矿有利区;5—工业铀矿体;6—铀矿化体

Fig.5 L3线地质—物探成果
a—氡浓度曲线;b—反演电阻率;c—地质推断成果;1—中侏罗统新民组;2—解释断裂构造;3—推测岩石风化面;4—预测成矿有利区;5—工业铀矿体;6—铀矿化体

Fig.6 五十家子盆地重点工作区综合成果
1—第四系;2—上侏罗统满克头鄂博组;3—中侏罗统新民组;4—地质界线;5—不整合接触界线;6—实测断裂构造;7—解释断裂构造;8—铀矿点及编号;9—氡气、CSAMT综合剖面测量位置及编号;10—铀工业孔及编号

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