综合物探方法寻找斑岩型钼矿床的应用试验研究---以姚冲钼多金属矿床为例

摘要

以姚冲大型钼多金属矿床为例，阐明了大别山北麓地区区域和矿床地质特征。通过在该地区开展岩矿石物性标本测试、综合物探剖面性研究（可控源音频大地电磁方法和频谱激电方法试验），试验及测试结果表明，姚冲钼矿床中含矿岩体为中低阻，高极化特征，姚冲钼矿床为斑岩体外接触带成矿，在深部高阻岩体的外侧存在一个低阻异常体，经钻孔验证，该低阻异常体为花岗斑岩体（脉）外接触带含辉钼矿的中元古界片麻岩。频谱激电法反演结果更进一步印证了物性测试结果和可控源音频大地电磁测深结果的准确性。因此，此次综合物探方法试验结果表明，可控源音频大地电磁测深和频谱激电法在该地区寻找斑岩型钼矿床是有效的，可为今后在该区域寻找斑岩型矿床提供技术参考。%The paper ,taking large molybdenum poly -metallic deposit of Yaochong as an example ,illustrates the geological and deposit features of the northern area of Dabie Mountains .The comprehensive geophysical prospecting method is carried out in the tests of the physical property of the exposed rocks and profile tests ( controlled source audio frequency magnetotelluric sounding method and induced polarization method ) .The experimental results show that the porphyry molybdenum deposit in the area has the features of low and medium resistivity and high polarization .Yao-chong molybdenum deposit are formed in outside contact zone of porphyry ,and on the outer edge of the deep rock mass with high resistance is an abnormal body with low resistance .Drilling results show that the low resistance abnormal body is molybdenite-bearing Mesoproterozoic gneiss in the outside contact zone of granite body (vein).The SIP 2D in-version results confirm the accuracy of the test of the physical property of the exposed rocks and CSAMT inversion re -sult.So the test results of comprehensive geophysical prospecting method show that controlled source audio frequency magnetotelluric sounding and spectral induced polarization method is effective for searching porphyry molybdenum de -posits in this area ,providing technical reference for future porphyry deposits prospecting in the region .