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现代矿业 ›› 2018, Vol. 34 ›› Issue (02): 1-7.

• 地质·测量 •    下一篇

下庄矿田铀矿勘查中综合物探法的应用实践

李英宾1,2,孙栋华1,2,谢明宏1,2,刘波1,2,张伟1,2   

  1. 1.核工业航测遥感中心;2.中核集团铀资源地球物理勘查技术中心重点实验室
  • 出版日期:2018-02-24 发布日期:2018-03-21
  • 基金资助:

    * 中国核工业地质局基金项目(编号:201137)。

Application of Integrated Geophysical Exploration Method in the Uranium Deposit Prospecting in Xiazhuang Orefield

Li Yingbin1,2,Sun Donghua1,2,Xie Minghong1,2,Liu Bo1,2,Zhang Wei1,2   

  1. 1.Airborne Survey and Remote Sensing Center of Nuclear Industry;2.Key Laboratory of Uranium Resources  Geophysical Exploration Technology,China Nuclear Industry Group Company
  • Online:2018-02-24 Published:2018-03-21

摘要: 下庄铀矿田是我国发现的第一个花岗岩型铀矿田,其浅部已进行了大量工作,但深部涉及较少。该矿田内已经发现的多个铀矿床及矿(化)点严格受断裂构造和岩性界线控制,进一步查明该矿田内深部断裂构造的空间展布形态、含矿性及岩性界线能够有效指导该区下一步的铀矿找矿工作。音频大地电磁测深(audio-frequency magnetotellurics,AMT)在硬岩地区探测隐伏断裂效果明显,地面伽玛能谱测量和RaA测氡对于反映隐伏构造在地表的位置、指示深部铀矿化信息均具有较好的效果,故而在该区开展了AMT测深、地面伽玛能谱测量和RaA测氡综合物探工作。通过分析AMT测深反演断面图、地面伽玛能谱测量和RaA测氡的综合成果图,以该区的地质、物化探特征为基础,划分了区内中粒黑云母花岗岩和细粒二云母花岗岩的岩体界线,基本查明了区内隐伏断裂构造的空间展布形态,并大致判断了断裂构造的含矿性,为该区下一步的地质勘探工作指明了方向,也为钻探施工提供了可靠依据。

关键词: 花岗岩型铀矿田, 深部找矿, 综合物探法, 音频大地电磁测深, 地面伽玛能谱测量RaA测氡

Abstract: Xiazhuang uranium orefield is the first granite type uranium orefield in China.A great deal of work is conducted in the shallow parts of the orefield,but the uranium deposits prospecting results related to the depth of the orefield is still relatively few.Many uranium deposits and ore (mineralization) points found in the orefield are strictly controlled by tectonic fractures and lithology boundary,further identification of the spatial distribution characteristics of the deep tectonic fractures,ore-bearing features and lithology boundary of the orefield is help for providing some reliable reference for the further uranium deposit prospecting work in the orefield.The detection effects of concealed fractures in the area with hard rock mass stratum by using audio-frequency magnetotellurics (AMT) is good,the application effects of the position reflection of the concealed structures in the surface and indication of the deep uranium mineralization information by adopting ground gamma ray spectrum measurement and RaA radon measurement are both ideal,so the integrated geophysical prospecting method (AMT,ground gamma ray spectrum measurement and RaA radon measurement) is used in the orefield to obtained deep prospecting information of uranium deposit (mineralization points).Through the comprehensive analysis of the ATM sounding inversion section, ground gamma ray spectrum measurement and RaA radon measurement results,and based on the geological,geophysical and geochemical characteristics of the orefield,the rock mass boundary of medium-grained black mica granite and fine-grained two-mica granite is divided,the spatial distribution shapes of the concealed fracture structures of the orefield is analyzed and the ore-bearing features of the fracture structures is discussed roughly,so as to provide some reliable reference for further conducting deep prospecting work of uranium deposit in the orefield.

Key words: Granite type uranium orefield, Deep prospecting, Integrated geophysical exploration method, Audio-frequency magnetotellurics, Ground gamma ray spectrum measurement, RaA radon measurement