综合物探方法在江西马岭地区花岗岩型铀矿勘查中的应用

The application of comprehensive geophysical method to granite type uranium exploration in MaLing region

介绍了音频大地电磁测深和土壤氡测量两种物探方法,在马岭地区花岗岩型铀矿勘查中的效果,通过本次物探工作,大致查明了区内控矿断裂特征和花岗岩体与下伏地层接触关系。实践表明:音频大地电磁测深具有较好的垂向分辨力,能够较准确地探测岩体的厚度、断裂构造规模及深部延伸情况、确定破碎带和裂隙带空间展布特征等;土壤氡测量可查明隐伏断层大体位置及深部铀矿化信息。通过钻孔揭露,发现数个铀矿化体。认为综合运用两种物探方法可以实现优势互补,为花岗岩型铀矿攻深找盲、外围扩大找矿提供有效技术手段。

The exploration effects of granite type uranium deposit in MaLing region by both methods of audio magnetotellu-ric （AMT） and soil radon measurement are introduced in this paper. The features of controlled - ore fault, the contact relations of granite body and underlying layer are ascertained roughly. Through geophysical work, it shows that AMT has the better vertical resolution than that in lateral direction. This can detect the thickness of rock body, scope and depth through-going characteristics of the fault, the distribution feature of fractured zone or crevasse zone？ etc. And soil radon measurement can as-certain rough position of the fault and depth uranium mineralization. Drilling results show that several uranium mineralized bodies were found. The using of both geophysical methods could achieve complementary advantages？ which can act as an effect way to search granite type uranium deposit in depth or surrounding.