盆地内部砂岩型铀矿找矿技术的设计与探讨
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本文为国家自然科学基金项目(编号U2067202,41862010,42172098),江西省自然科学基金项目(编号20202BAB213017),江西省放射性地学大数据技术工程实验室开放基金项目(编号JELRGBDT202007),东华理工大学核资源与环境国家重点实验室开放基金项目(编号 NRE1809)和中国铀业有限公司- 东华理工大学核资源与环境国家重点实验室联合创新基金项目(编号NRE2021- 02)联合资助的成果。


Discussion and design of exploration technology for sandstone- type uranium deposits in the interior of the sedimentary basins
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    摘要:

    长期以来,盆地边缘是砂岩型铀矿找矿与勘探的主要区域。然而,近年在盆地内部也探明了多个铀矿床、矿化点,表明盆地内部同样具有良好的铀矿找矿前景。文章剖析了盆地内部砂岩型铀矿的矿床特征,并据此凝练出“大型中- 酸性火成岩隆起+隆起区翼部深大断裂”的关键控铀成矿要素。结合砂岩型铀矿成矿理论,设计了一套相适应的找矿方法组合。该找矿方法组合可分为2个步骤:① 勘探靶区初筛。根据区域重、磁、放射性、遥感等资料查明盆地内部基底起伏和埋深、识别岩性和划分断裂,将岩性为中- 酸性火成岩且发育断裂的隆起区圈定为潜在勘探靶区。结合含矿目的层产出特征、隆起区翼部坡度和隆起区面积等因素来初筛勘探靶区;② 勘探靶区优选。在初筛的勘探靶区深大断裂位置沿隆起区方向布置并实施钻探。通过对地下水“补- 径- 排”体系、含矿目的层供铀和聚铀能力以及氧化- 还原带发育情况等的评价来优选勘探靶区,为下一步铀矿勘探工作的布置与实施提供有益指导。该方法充分利用区域地球物理数据和公开可下载的资料,可极大地降低勘探成本。着眼于关键控铀成矿要素,优选相适应的地质、地球物理等方法,可有效提高盆地内部砂岩型铀矿找矿与勘探的效率。

    Abstract:

    For a long time, the margin of the sedimentary basins played a vital role in sandstone type uranium deposit prospecting and exploration. In recent years, however, several uranium deposits and mineralization spots have been discovered in the interior of the basins, presenting a good exploration potential of uranium deposit. This paper studied the characteristics of uranium deposits in the interior of the basins and summarized the crucial uranium ore- controlling metallogenic elements of “large igneous upwelling area and fractures in the edge of upwelling area”. Combined with the metallogenic theory of sandstone- type uranium deposit, a set of combination of suitable prospecting methods is designed, which can be divided into two steps. Firstly, preliminary screening of exploration target area. According to regional gravity, magnetic, radioactive and remote sensing data, the relief and burial depth of the basin basement, lithology classification, and faults division was identified. The upwelling area with intermediate- acid igneous rock and developing faults was delineated as potential exploration target area. Subsequently, the exploration target was preliminarily screened with a combination of features of the ore- bearing strata, the slope and area of upwelling area. Secondly, exploration target area was optimized. In the preliminary screened exploration area, several drill holes were arranged and drilled in the area from deep and large faults to the upwelling area. By comprehensively evaluating the groundwater “recharge, runoff and drainage” system, the uranium supply, accumulation capacity and development of redox transitional zone of ore- bearing strata, favorable exploration target area could be selected, which provides useful guidance for the layout and implementation of uranium exploration work in the next step. This method makes full use of regional geophysical data and open downloadable data, which can greatly reduce the exploration cost. Focusing on the key elements of uranium- controlling mineralization and selecting appropriate geological and geophysical methods can effectively improve the efficiency of prospecting and exploration of sandstone type uranium deposits in the interior of the basin.

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封志兵,聂逢君,宁媛丽,江丽,夏菲,何剑锋,盛洲宁.2022.盆地内部砂岩型铀矿找矿技术的设计与探讨[J].地质学报,96(6):2217-2229.
Feng Zhibing, Nie Fengjun, Ning Yuanli, Jiang Li, Xia Fei, He Jianfeng, Sheng Zhouning.2022. Discussion and design of exploration technology for sandstone- type uranium deposits in the interior of the sedimentary basins[J]. Acta Geologica Sinica,96(6):2217-2229.

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  • 收稿日期:2021-05-18
  • 最后修改日期:2021-12-14
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  • 在线发布日期: 2022-06-27
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