| 王 伟.CSAMT与土壤氡气测量在砂岩型铀矿勘查中的应用：以内蒙古巴音杭盖地区为例[J].地质与勘探,2019,55(5):1241-1249 |
| CSAMT与土壤氡气测量在砂岩型铀矿勘查中的应用：以内蒙古巴音杭盖地区为例 |
| Application of the CSAMT method and soil radon measurement in surveys for sandstone-type uranium deposits：An example of the Bayinhanggai area, Inner Mongolia |
| 投稿时间：2018-02-07 修订日期：2019-03-11 |
| DOI：10.12134/j.dzykt.2019.05.011 |
| 中文关键词: 砂岩型铀矿 CSAMT 土壤氡气测量 巴音杭盖地区 内蒙古 |
| 英文关键词: sandstone-type uranium deposits, CSAMT, radon soil survey, Bayinhanggai, Inner Mongolia |
| 基金项目:中国地质调查局内蒙古二连盆地中西部铀矿资源远景调查项目（编号：DD2016013607）和中国核工业地质局内蒙古二连盆地铀矿资源调查评价与勘查项目（编号：201602）资助。 |
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| 中文摘要: |
| 砂岩型铀矿是我国目前铀矿勘查中最重要的类型之一，北方中新生代盆地有寻找砂岩型铀矿的广阔前景。由于其埋深大、上覆沉积泥岩层较厚，常规物化探方法在该类型铀矿的应用效果不佳。本文在二连盆地巴音杭盖地区开展了可控源音频大地电磁测量(CSAMT)和土壤氡气测量，在重点异常地段进行了CSAMT正反演和土壤氡气抽气试验，然后对推测的砂体和土壤氡气异常部位进行钻孔揭露，结果表明砂体厚度和位置与CSAMT推测对应的较为一致，并发现了好的铀矿化线索。该方法为该地区下一步砂岩型铀矿地质勘查提供了有效的依据,对我国北方砂岩型铀矿开展地球物理工作有一定的借鉴和指示意义。 |
| 英文摘要: |
| Sandstone type uranium deposits are one of the most important types encountered during uranium exploration in our country at present, which have broad prospects in the Mesozoic-Cenozoic basins in northern China. Due to their large buried depth and thick overlying sedimentary mudstone, it is not very effective in the application of conventional geophysical and geochemical methods to surveys for these uranium deposits. To solve this problem, we attempted to use jointly the controlled source audio magnetotelluric (CSAMT) method and soil radon measurement to conduct such surveys, taking the Bayinhanggai area in the Erlian Basin, Inner Mongolia as an experimental site. At the chosen anomaly sections, forward modeling and inversion of CSAMT data and soil radon aspiration tests were carried out. Then the soil radon anomalies and inferred sand bodies were examined by drilling. The results show that thicknesses and positions of the sand bodies from soil radon data are in good agreement with that from CSAMT, providing a good clue of uranium mineralization. It provides an effective basis for the next step of geological exploration of sandstone type-uranium deposits in this area, and can shed light on geophysical surveys for sandstone-type uranium deposits in the north of China. |
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