Application of Comprehensive Geophysical Prospecting Method in the Prediction of Mineral Resources in Qinling with High Vegetation Coverage and Deep Cut Area
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摘要:
北秦岭地区是中国重要的金多金属资源产地，特别是近年来蟒岭岩体周缘作为北秦岭成矿带的重要矿集区之一，其成矿作用及控矿系统备受瞩目，但区内林木茂密地形切割严重，未系统开展过地球物理工作。笔者通过应用综合地球物理方法在北秦岭蟒岭岩体南缘庙沟地区开展找矿预测，探索秦岭成矿带深切割、高植被覆盖区找矿预测技术方法组合。在工作区开展地面高精度磁法、激电中梯及可控源音频大地电磁测量（CSAMT）等地球物理探测，综合物探方法联合解译了区域各地层间接触关系以及隐伏岩体侵位形成的推覆形态，对区域含矿断裂带形态展开研究，预测区域赋矿部位与成矿潜力，结合工程揭露结果总结地球物理找矿标志，圈定有利成矿区，为今后该地区勘查提供重要依据。
Abstract:The North Qinling area is an important source of gold polymetallic resources in China, especially in recent years, the periphery of the Mangling pluton is one of the important ore concentration areas of the North Qinling metallogenic belt, and its metallogenic effect and ore-controlling system have attracted much attention. However, the densely forested terrain in the area is severely cut, and no systematic geophysical work has been carried out. In this paper, through the application of comprehensive geophysical method Miaogou area on the southern margin of the n North Qinling rock pythons ridge predicting prospecting and exploration deep cut and high vegetation coverage area of the Qinling metallogenic belt in the prospecting prediction techniques combination. In the work area, geophysical surveys such as ground high-precision magnetic method, IP and controlled source audio magnetotelluric survey (CSAMT) are carried out. The comprehensive geophysical method jointly interprets the contact relationship between various layers in the region and the formation of the emplacement of the hidden rock mass. The shape of the nappe and the research on the shape of the regional ore-bearing fault zone. Conduct research on the morphology of the regional ore-bearing fault zone, predict the ore-bearing location and metallogenic potential of the region, summarize the geophysical prospecting signs based on the results of engineering disclosure, delineate favorable metallogenic areas, and provide an important basis for future exploration in this area.
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表 1 矿区岩、矿石电性参数表
Table 1. Mine rock and ore electrical parameter table
岩性 块数 电阻率ρ（Ω·m） 极化率η（%） 备注 区间 平均值 区间 平均值 花岗岩岩体 20 306～ 1615 721.6 0.365～2.97 0.79 狮子坪岩体 砾岩 10 153～423 242.2 0.275～1.2 0.61 晚侏罗纪 石英片岩 16 44～314 214.3 1.06～1.48 1.27 二叠纪 蚀变石英片岩 20 60～238 127.68 0.56～32.31 4.03 破碎 接触带 8 772～996 878.8 6.34～9.5 7.78 未破碎 安山岩 5 298～457 361.3 0.83～1.08 0.96 含碳质片岩 5 23～47 31 5.13～6.15 5.49 
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表 2 矿区岩、矿石磁性参数表
Table 2. Mine rock and ore magnetic parameter table
岩性 块数 磁化率SI（10−6） 备注 区间 平均值 花岗岩岩体 37 105～654 324.4 狮子坪岩体 砾岩 15 10～28 16.3 晚侏罗纪 石英片岩 20 0～4 1.73 二叠纪 蚀变石英片岩 15 -4～4 0.13 破碎 蚀变石英片岩 10 9～16 12.8 未破碎 安山岩 5 371～504 422 含碳质片岩 10 3～12 7.1
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