闽西南大排多金属矿区地球物理响应特征与找矿启示

孟小红, 王俊, 刘国峰, 陈召曦, 倪建辉, 张达, 谭捍东, 李淑玲, 方圆, 郑师警. 2021. 闽西南大排多金属矿区地球物理响应特征与找矿启示. 地球物理学报, 64(3): 949-964, doi: 10.6038/cjg2021O0502
引用本文: 孟小红, 王俊, 刘国峰, 陈召曦, 倪建辉, 张达, 谭捍东, 李淑玲, 方圆, 郑师警. 2021. 闽西南大排多金属矿区地球物理响应特征与找矿启示. 地球物理学报, 64(3): 949-964, doi: 10.6038/cjg2021O0502
MENG XiaoHong, WANG Jun, LIU GuoFeng, CHEN ZhaoXi, NI JianHui, ZHANG Da, TAN HanDong, LI ShuLing, FANG Yuan, ZHENG ShiJing. 2021. Geophysical response characteristics of the Dapai polymetallic mining area in Southwestern Fujian Province and its prospecting implications. Chinese Journal of Geophysics (in Chinese), 64(3): 949-964, doi: 10.6038/cjg2021O0502
Citation: MENG XiaoHong, WANG Jun, LIU GuoFeng, CHEN ZhaoXi, NI JianHui, ZHANG Da, TAN HanDong, LI ShuLing, FANG Yuan, ZHENG ShiJing. 2021. Geophysical response characteristics of the Dapai polymetallic mining area in Southwestern Fujian Province and its prospecting implications. Chinese Journal of Geophysics (in Chinese), 64(3): 949-964, doi: 10.6038/cjg2021O0502

闽西南大排多金属矿区地球物理响应特征与找矿启示

  • 基金项目:

    国家自然科学基金重点基金项目"推覆构造控矿的地球物理响应研究"(41530321)资助

详细信息
    作者简介:

    孟小红, 女, 1958年生, 教授, 主要从事位场方法技术与综合地球物理应用研究.E-mail: mxh@cugb.edu.cn

    通讯作者: 王俊, 男, 1989年生, 副教授, 主要从事位场方法技术与应用研究.E-mail: wangj@cugb.edu.cn
  • 中图分类号: P631

Geophysical response characteristics of the Dapai polymetallic mining area in Southwestern Fujian Province and its prospecting implications

More Information
  • 大排多金属矿区位于闽西南坳陷大田—龙岩次级坳陷带南部,政和—大埔深大断裂西侧,是福建省较大的多金属矿产地之一.随着找矿勘查的不断深入,对在该矿区外围和深部寻找隐伏矿床提出了迫切需求,但研究区地表地形崎岖、植被茂密,以往很少进行高精度大比例尺的综合地球物理调查,因此对隐伏的控矿构造、赋矿层位和火成岩体分布的认识远不能满足深部找矿的需求.本文实施了反射地震、可控源音频大地电磁剖面测量和大比例尺航磁面积性测量,在成矿理论和找矿模型的指导下采用反射地震真地表偏移成像技术、可控源音频大地电磁二维带地形反演技术和航磁数据精细处理与三维反演技术,提取识别了剖面浅层逆冲推覆控矿构造和赋矿层位的反射地震特征,与成矿关系密切的燕山期火成岩体的地震、电磁特征,以及控矿构造和隐伏岩体平面分布的航磁异常特征.在地表地质和已知钻孔岩心及物性的约束下,构建了剖面的综合地球物理的地质解释模型,包括浅层推覆构造和控矿地层分布,推断解释大断裂6条,次级断裂16条和3处较大的隐伏岩体分布,为深入认识研究区的矿床成因和分布规律,指导在外围和深部找矿提供了地球物理有效响应特征.

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  • 图 1 

    研究区构造地质图(修改自李培等,2019)

    Figure 1. 

    Simplified structural geological map of the study area (modified from Li et al., 2019)

    图 2 

    大排矿区主要地层岩性柱状图(修改自杜一波,2018)

    Figure 2. 

    Lithology histogram of the main strata in Dapai deposit (modified from Du, 2018)

    图 3 

    大排矿区主要侵入岩岩心(修改自杜一波,2018)

    Figure 3. 

    Main invade rock cores of Dapai deposit (modified from Du, 2018)

    图 4 

    研究区地质图和测区测线位置图(地震和CSAMT剖面)

    Figure 4. 

    Geological map with survey line location of Dapai deposit (seismic and CSAMT profiles)

    图 5 

    (a) 航磁总场磁异常;(b) 航磁化极异常;(c) 区域磁异常;(d) 剩余磁异常

    Figure 5. 

    (a) Aeromagnetic total field magnetic anomaly; (b) Reduced-to-pole magnetic anomaly; (c) Regional magnetic anomaly; (d) Residual magnetic anomaly

    图 6 

    反射地震真地表深度偏移成像

    Figure 6. 

    Depth migration imaging of reflection seismic data from real surface

    图 7 

    (a) CSAMT数据采集观测系统;(b) CSAMT源与测试位置图

    Figure 7. 

    (a) Data acquisition and observation system of CSAMT; (b) The source of CSAMT and its location

    图 8 

    CSAMT数据反演的电阻率剖面

    Figure 8. 

    Inverted resistivity profile from CSAMT data

    图 9 

    研究区推断断裂和磁异常线性特征叠合

    Figure 9. 

    The overlap of fault inference with magnetic linear features of the study area

    图 10 

    研究区断裂推断图(a)在区域磁异常上的叠加图;(b)在剩余磁异常上的叠加图

    Figure 10. 

    The deduced faults in the study area overlay image on (a) regional magnetic map; (b) residual magnetic map

    图 11 

    研究区航磁3D反演结果

    Figure 11. 

    3D inversion result of magnetic data in the study area

    图 12 

    岩心的岩性及其合成地震记录

    Figure 12. 

    The lithology and the synthetic seismic trace of (a) zk1001, (b) zk2001

    图 13 

    连井地震剖面,右图为左图的放大显示

    Figure 13. 

    Well seismic profiles, the right picture is the enlarged display of the left one

    图 14 

    地震剖面、电阻率剖面、磁化率剖面综合解释断层和岩体

    Figure 14. 

    Joint interpretation of faults and magma invasion from seismic profile, resistivity profile and magnetic susceptibility profile

    图 15 

    剖面综合地质解释

    Figure 15. 

    Comprehensive geological interpretation of profile AB

    表 1 

    岩心物性参数表

    Table 1. 

    Physical properties of drilling core

    序号 岩性 P波速度(m·s-1) 密度(g·cm-3) 波阻抗(105 cm2·s) 样本个数
    1 灰岩 5864 2.6 10.72 5
    2 泥岩 5923 2.57 7.50 5
    3 大理石 3946 2.57 6.35 5
    4 磁铁矿 6511 3.65 19.81 2
    5 铅锌矿 6403 3.05 18.64 4
    6 矽卡岩 4800 2.55 - 5
    7 花岗岩 5490 2.65 11.06 5
    下载: 导出CSV
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出版历程
收稿日期:  2020-12-18
修回日期:  2021-01-09
上线日期:  2021-03-10

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