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综合地球物理方法找矿应用: 以智利科皮亚波地区月亮山磁铁矿型IOCG矿床为例

李天成 方维萱 王磊 陈家乐 张平

李天成, 方维萱, 王磊, 等, 2022. 综合地球物理方法找矿应用: 以智利科皮亚波地区月亮山磁铁矿型IOCG矿床为例. 地质力学学报, 28 (1): 22-35. DOI: 10.12090/j.issn.1006-6616.20222802
引用本文: 李天成, 方维萱, 王磊, 等, 2022. 综合地球物理方法找矿应用: 以智利科皮亚波地区月亮山磁铁矿型IOCG矿床为例. 地质力学学报, 28 (1): 22-35. DOI: 10.12090/j.issn.1006-6616.20222802
LI Tiancheng, FANG Weixuan, WANG Lei, et al., 2022. Application of integrated geophysical method in prospecting: A case study of the magnetite-type IOCG deposits in the Moon Mountain exploration area, Copiapo, Chile. Journal of Geomechanics, 28 (1): 22-35. DOI: 10.12090/j.issn.1006-6616.20222802
Citation: LI Tiancheng, FANG Weixuan, WANG Lei, et al., 2022. Application of integrated geophysical method in prospecting: A case study of the magnetite-type IOCG deposits in the Moon Mountain exploration area, Copiapo, Chile. Journal of Geomechanics, 28 (1): 22-35. DOI: 10.12090/j.issn.1006-6616.20222802

综合地球物理方法找矿应用: 以智利科皮亚波地区月亮山磁铁矿型IOCG矿床为例

doi: 10.12090/j.issn.1006-6616.20222802
基金项目: 

国土资源部公益性行业科研专项基金 201511016-1

国家科技支撑计划 2006BAB01B09

科技部科研院所技术开发专项 2011EG115022

详细信息
    作者简介:

    李天成(1969-), 男, 博士, 教授级高级工程师, 主要从事金属矿产勘查和找矿预测。E-mail: 283699865@qq.com

  • 中图分类号: P612;P631

Application of integrated geophysical method in prospecting: A case study of the magnetite-type IOCG deposits in the Moon Mountain exploration area, Copiapo, Chile

Funds: 

the Special Fund for Public Welfare Scientific Research of the Ministry of Natural Resources 201511016-1

the National Science and Technology Support Plan 2006BAB01B09

the Special Project for Technology Development of Scientific Research Institutes of the Ministry of Science and Technology 2011EG115022

  • 摘要: 智利科皮亚波地区地处海岸山带东侧的智利铁带北段,已发现多个中—大型磁铁矿型IOCG矿床,该类矿床的形成与大洋俯冲背景下陆缘弧中性—铁镁质火山岩和火山-沉积建造中早白垩世中酸性岩浆岩的侵入中心密切相关。该成矿带大面积被第四系砂砾层覆盖,在成矿地质特征研究基础上,采用综合地球物理方法对覆盖层下隐伏矿床(体)进行定位预测成为技术关键并具有现实需求。通过深入研究科皮亚波地区磁铁矿型IOCG矿床的成矿地质特征,并采用航磁深部地质解译初选勘查靶区,结合磁铁矿型IOCG矿床成矿地质-物性参数统计分析,建立了勘查区磁铁矿型IOCG矿床成矿地质-地球物理异常模式,采用综合地球物理方法在月亮山勘查区第四系覆盖区圈定的深部靶位经钻孔验证,发现了大型隐伏磁铁矿型IOCG矿床。

     

  • 图  1  智利中北部阿塔卡玛断裂带和IOCG矿床

    Figure  1.  Atacama fault zone and IOCG deposits in north central Chile

    图  2  智利科皮亚波区域地质-航磁异常综合图(据Arévalo, 1995修改)

    Figure  2.  Integrated map of regional geology and aeromagnetic anomalies in Copiapo, Chile(modified after Arévalo, 1995)

    图  3  智利科皮亚波地区航磁△T异常和系列上延异常图

    a—△T异常; b—上延高度1000 m; c—上延高度2000 m; d—上延高度5000 m

    Figure  3.  Maps showing aeromagnetic anomaly and anomalies upward in Copiapo, Chile

    (a) △T anomaly; (b) Upward continue to 1000 m; (c) Upward continue to 2000 m; (d) Upward continue to 5000 m

    图  4  勘查区(月亮山7号点)及外围地质简图

    Figure  4.  Geological sketch of the exploration area (Spot 7 in the Moon Mountain area) and the periphery

    图  5  勘查区(月亮山7号点)IOCG型铁铜矿区磁异常平面图

    a—原始磁异常; b—剩余磁异常

    Figure  5.  Plan of magnetic anomaly of IOCG iron-copper deposits in the exploration area (Spot 7 in the Moon Mountain area)

    (a) Original magnetic anomaly; (b) Remnant magnetic anomaly

    图  6  反演三维磁化率模型图

    图中灰度体为反演磁化率≥0.65SI的磁性体, 灰度由浅至深表示反演磁化率由0.65→0.90SI

    Figure  6.  Model of three-dimensional magnetic susceptibility inversion (coordinate unit: m)

    The gray volumns are the magnetic volumns with inverse magnetic susceptibility ≥0.65SI, and the grayscale from light to dark indicates that the inverse magnetic susceptibility changes from 0.65 to 0.90SI

    图  7  月亮山IOCG型铁铜矿区P2剖面综合断面图

    Figure  7.  Integrated section of Profile P2 of the IOCG iron-copper deposits in the Moon Mountain area

    表  1  勘查区岩(矿)石磁化率参数测试统计表

    Table  1.   Statistical table of magnetic susceptibility parameters of rocks (ores) in the exploration area

    岩矿石名称 标本数/块 SI/×10-3(国际单位制) ucgs(高斯单位制)
    极值 平均值 极值 平均值
    安山岩 34 9.47~25.50 14.81 754~2029 1179
    安山质角砾岩 37 1.06~16.80 6.88 84~1337 547
    构造角砾岩 33 0.13~8.27 3.70 10~658 294
    硅化构造角砾岩 51 0.002~9.710 3.15 0~773 251
    蚀变安山岩 31 0.22~6.84 2.62 18~544 241
    闪长岩 162 14.70~68.50 39.10 1170~5451 3111
    赤铁矿 65 0.14~21.70 6.95 11~1727 553
    赤铁矿化硅化安山角砾岩 114 0.66~27.00 8.60 53~2149 688
    磁铁矿化安山岩 28 24.80~124.00 55.30 1974~9868 4400
    磁铁矿化硅化安山角砾岩 18 28.60~117.00 63.20 2276~9311 5032
    磁赤铁矿 22 37.80~88.00 51.20 3008~7003 4074
    磁铁矿 30 317~(>1000) 693.00 25226~(>80000) 55147
    含铁铜安山质角砾岩 15 0.93~27.20 12.42 74~2165 988
    含铜磁铁矿 9 77.10~526.00 195.80 6135~41858 15581
    黄铁矿化硅化安山角砾岩 14 1.34~28.10 12.21 107~2236 971
    表中">"表示大于
    下载: 导出CSV

    表  2  勘查区岩(矿)石电阻率、极化率参数测试统计表

    Table  2.   Statistical table of resistivity and polarizability parameters of rocks (ores) in the exploration area

    岩矿石名称 标本数/块 极化率/% 电阻率/(Ω·m)
    最小 最大 平均值 最小 最大 平均值
    赤铁矿 10 1.04 2.71 1.65 895.14 1835.30 1117.20
    蚀变安山岩 6 0.69 1.89 1.20 147.09 813.03 529.80
    安山岩 13 0.67 1.65 1.13 800.00 1350.96 1023.20
    闪长岩 10 0.69 1.67 1.11 811.59 1822.71 1117.75
    含铜磁铁矿 6 3.45 14.75 6.29 45.85 1430.97 330.58
    磁铁矿 11 3.94 14.34 5.78 15.93 170.45 55.12
    辉绿岩 2 0.76 1.00 0.88 160.84 485.56 323.20
    构造角砾岩 13 0.45 2.11 1.19 853.03 1440.00 1116.29
    黄铁矿化角砾岩 6 2.96 5.03 3.71 254.52 938.89 511.76
    下载: 导出CSV
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  • 收稿日期:  2021-10-12
  • 修回日期:  2021-12-14

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