The Geophysical Field Characteristics of Langshan Metallogenic Belt in Inner Mongolia
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摘要: 内蒙狼山区域深部构造非常发育、复杂，岩浆岩具有多期侵入且明显受到深部断裂构造控制的分布特征.目前对于该地区深部断裂构造、区域地质结构特征、成矿远景区的划分，还没有详细深入的研究.结合已有的地质资料，对狼山成矿带主要构造区进行了地球物理场分析，研究了狼山成矿带6条断裂构造、岩浆岩分布及区域深部地质结构特征，圈定了4处成矿远景区，为深入认识狼山成矿带成矿环境地质结构特征和成矿潜力提供了依据.Abstract: The deep structure in the Langshan region is very developed and complex, and the magmatic rock with multiphase intrusion is controlled by deep faults. To in-depth understanding the metallogenic environment geology structure characteristics of Langshan metallogenic belt, combined with the existing geological data, this paper analyzes the geophysical field about the main tectonic zone of Langshan metallogenic belt, studies six fracture structure, the magmatic rocks distribution and the regional deep geological structure, and selects four metallogenic prospect areas. It provides basis for further studying the metallogenic potential and metallogenic environment geology structure characteristics of Langshan metallogenic belt.
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图 1 内蒙狼山地质走廊带地质矿产图
据项目报告《内蒙狼山地质走廊带综合地球物理调查》，中国地质科学院地球物理地球化学勘查研究所，2013
Fig. 1. The distribution of the main metal ore deposit and mines of the Langshan region and peripheral area
图 2 狼山地区及外围布格重力异常图
Fig. 2. The gravity anomaly map of the Langshan region and peripheral area
图 3 狼山地区及外围航磁异常图
Fig. 3. The aeromagnetic anomaly map of the Langshan region and peripheral area
图 4 航磁异常三维反演高磁体分布图（a）和重力异常三维反演不同深度切面图（b）
Fig. 4. The high magnet of 3D aeromagnetic anomalies (a) and the sectional drawing of 3D gravity anomalies (b)
图 5 狼山地区区域重力异常及推断深部断裂构造分布图
Fig. 5. The regional gravity anomaly and the deep fracture inferred distribution of the Langshan region
图 6 狼山地区区域重力异常方向导数及推断深部断裂构造分布图
Fig. 6. The regional gravity anomaly directional derivative and the deep fracture inferred distribution of the Langshan region
图 7 狼山地区航磁异常与推断深部断裂构造及岩浆岩分布
Fig. 7. The aeromagnetic anomaly, the deep fracture inferred and magmatic rocks distribution of the Langshan region
图 8 狼山地区航磁异常与推断断裂及找矿远景区综合图
Fig. 8. The aeromagnetic anomaly, the deep fracture inferred and prospect areas of the Langshan region
表 1 狼山地区岩矿石物性
Table 1. The property statistics of rock ore of the Langshan region
矿石 样品数量 密度算术均值 磁化率几何均值 变质砂岩 28 2.662 148 超基性岩 6 2.661 2 277.7 粗砂岩 6 2.555 98.6 大理岩 10 2.669 2.6 二长花岗岩 15 2.618 451.9 粉砂岩 21 2.552 102.9 黑云母花岗岩 9 2.647 21.2 花岗闪长岩 36 2.642 146.2 花岗岩 138 2.605 79 灰岩 21 2.673 15.4 辉绿岩 15 2.866 1 046.5 结晶灰岩 28 2.743 27.7 砾岩 6 2.618 98.2 片麻岩 24 2.701 83.5 片岩 60 2.717 222.2 浅粒岩 13 2.674 46 砂岩 96 2.499 93.8 砂砾岩 74 2.502 186.7 闪长岩 48 2.767 413.1 石英片岩 24 2.768 329.7 石英闪长岩 12 2.702 195.5 石英岩 7 2.575 5.5 斜长花岗岩 15 2.603 27 斜长角闪片麻岩 29 2.734 234.9 斜长角闪岩 16 2.736 313.2 玄武岩 18 2.768 24 299.1 云母花岗岩 18 2.625 89.2 云母片岩 33 2.665 159.4 注：密度单位为103 kg/m3，磁化率单位为10-6 SI. 
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表 2 狼山地区地层、侵入岩体物性
Table 2. The physical property statistics of strata and intrusive rock in the Langshan region
界 系 组/群 样品数量 密度算术均值 磁化率几何均值 剩磁强度 主要岩性 新生界 第四系 12 2.188 115.2 1.4 砂岩、粉砂岩 中生界 白垩系 二连组 33 2.499 52.7 1.4 砾岩、砂砾岩、砂岩 固阳组 24 2.605 735.3 13.7 砂砾岩、砂岩，夹玄武岩 李三沟组 39 2.479 108.5 1.5 砂砾岩、砂岩 侏罗系 长汉沟组 42 2.619 264.7 1.4 砾岩、砂砾岩、砂岩 五当沟组 41 2.485 255.8 1.1 砂砾岩、砂岩 上古生界 二叠系 包特格组 24 2.694 90.5 3.2 灰岩、砂岩、粉砂岩夹安山岩 大红山组 40 2.689 180.8 14.9 变质粉砂岩、砂岩、角砾岩、结晶灰岩，夹安山玢岩、火山角砾岩 石炭系 阿木山组 38 2.671 25.6 3.4 结晶灰岩、硬砂岩、粉砂岩 下古生界 志留系 徐尼特组 39 2.631 122.0 19.2 变质砂岩、粉砂岩、板岩 中上元古界 刘鸿湾组 51 2.700 170.5 0.6 片麻岩、片岩、浅粒岩、石英岩、结晶灰岩 阿古鲁沟组 45 2.702 127.4 1.0 片麻岩、片岩、浅粒岩 书记沟组 36 2.742 354.0 1.6 斜长角闪岩、片麻岩、片岩、变粒岩 增隆昌组 21 2.740 41.2 0.6 结晶灰岩、大理岩、变质砂岩 温都尔庙群 45 2.649 71.2 1.8 片麻岩、片岩、变质砂岩、结晶灰岩 下元古界 宝音图群 48 2.697 101.1 2.2 斜长角闪岩、片麻岩、片岩、变粒岩、浅粒岩、石英岩、结晶灰岩 上太古界 色尔腾山岩群 48 2.697 77.6 0.5 斜长角闪岩、片麻岩、片岩、变粒岩 侵入体 白垩纪 18 2.679 2 495.3 400.6 花岗岩、玄武岩 侏罗纪 39 2.616 283.7 3.5 花岗岩、二长花岗岩 三叠纪 51 2.611 47.4 1.0 花岗岩 二叠纪 54 2.681 240.4 2.7 花岗岩、花岗闪长岩、闪长岩、辉绿岩 石炭纪 72 2.646 93.0 2.0 花岗岩、花岗闪长岩、辉绿岩 泥盆纪 21 2.736 249.7 2.6 闪长岩 志留纪 39 2.646 75.4 1.1 花岗岩、闪长岩 中元古代 42 2.704 246.5 1.9 花岗岩、花岗闪长岩、闪长岩 注：密度单位为103 kg/m3，磁化率单位为10-6 SI.
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