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The application of comprehensive geophysical prospecting method to the exploration of the Yuejinshan iron deposit in Qinghai |
Yu-Lu LI, Li-Juan XING, Zhan-Hong BAI, Zhi-Hua LIU, Zhen WANG |
The First Geological and Mineral Prospecting Institute of Qinghai Province, Haidong 810600, China |
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Abstract In this paper, the authors utilized the high-precision ground magnetic survey and Controlled Source Audio Frequency Magnetotelluric (CSAMT) technique to study the Yuejinshan iron deposit in Qinghai Province. The integrated geological and geophysical survey in this area shows that it is vital to design appropriate strategies and adopt suitable methods for ore explorations in areas of complex topography and geological setting. The choice of strategies and methods has a direct and significant influence on the final survey results. The studies also indicate that a combination of high-precision ground magnetic survey and CSAMT technique can produce highly reliable survey results for this area. The authors made an integrated evaluation for the mine exploration prospect in Yuejinshan area based on an analysis of local geological settings and geophysical anomalies. The geological-geophysical prospecting model developed in this study can serve as a valuable prototype for mine exploration in areas with similar geological evolution settings.
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Received: 22 December 2017
Published: 24 October 2018
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岩石名称 | κ/(4π×10-6 SI) | 剩余磁化强度Jr/(10-3 A/m) | ρ/(Ω·m) | 变化范围 | 常见值 | 变化范围 | 常见值 | 变化范围 | 常见值 | 大理岩 | 0~30 | 12.2 | 1.56~5.69 | 4.87 | 85~9076 | 2921 | 片麻岩 | 18~320 | 99.3 | 7.72~21.27 | 13.15 | 2360~5819 | 3686 | 花岗闪长岩 | 0~3800 | 956 | 4.47~112.45 | 26.08 | 1956~4370 | 3176 | 角闪岩 | 500~2200 | 1620 | 205.93~2071.18 | 1120.10 | 154~4288 | 699 | 磁铁矿化大理岩 | 3200~30000 | 9767 | 17.4~18191.66 | 3408.09 | 357~64361 | 17254 | 矽卡岩化片麻岩 | 35~320 | 149 | 24~1501 | 288 | 109~19651 | 1980 | 磁铁矿化蛇纹岩 | 10000~45000 | 27500 | 15.08~152068.01 | 9525.06 | 15~109 | 62 | 磁铁矿 | 18000~140000 | 73500 | 2745.78~16863 | 8297.54 | 22~498 | 259 |
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标志分类 | 特征 | 地 质 | 含矿地层 | 金水口岩群下岩组三岩段地层 | 赋矿岩性 | 侵入于金水口岩群下岩组三岩段地层的超基性岩体经交代蚀变形成的蛇纹岩,磁铁矿化大理岩 | 含矿母岩 | 超基性岩体 | 控矿构造 | 跃进山背斜 | 岩浆岩 | 华力西期中酸性侵入岩 | 围岩蚀变 | 硅化、绢云母化、高岭土化、绿泥石化、矽卡岩化、碳酸盐化 | 伴生矿化 | 褐铁矿化、黄铁矿化、孔雀石化 | 地表直接 找矿标志 | 蛇纹岩 | 矿床类型 | 岩浆晚期分异型铁矿床 | 矿床成因 | 侵入于早元古代金水口岩群下岩组三岩段地层的超基性岩体经热液蚀变作用全部变质形成磁铁矿化蛇纹岩 | 地 球 物 理 | 探测目标 | 磁铁矿带 | 目标物性 | 低阻(<250 Ω·m),高极化率(>8%),高磁化率(>10 000×4π×10-6 SI) | 地面异常 | 化极后的强磁异常是浅地表磁铁矿的直接反映,垂向二阶导数极大值位置对应地表磁铁矿的出露位置;上延后的低缓磁异常往往是中深部隐伏磁铁矿的反映 | 深部异常 | CSAMT测深低阻异常与磁法3D反演出的高磁化率磁性体对应部位为含矿位置 |
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