广域电磁法在胶西北金矿集中区深部探测中的应用研究

doi:10.11720/wtyht.2020.0256

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胶西北矿集区内的焦家与三山岛断裂带是著名的金矿成矿带,近年深部找矿成果显著,目前钻孔已揭露至 4 006 m,以往的物探方法深部探测效果不佳,亟需有效的深部探测地球物理技术。将广域电磁法应用于焦家—三山岛断裂带已知剖面,断面揭示两大断裂带形成的低阻带特征明显,真实反映了地下电性分布,视电阻率高阻、中低阻的分布反映了玲珑花岗岩体及变质岩体的展布;同时断面清晰展示了两大断裂在深度4 km附近交汇,剖面为研究焦家—三山岛断裂之间的断裂特征提供了依据。应用试验表明,广域电磁法探测深度大,抗干扰能力强,在胶西北岩浆岩分布区探测低阻断裂带具有较好的效果,是该区5 000 m深度范围内很好的非震地球物理方法。

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	王洪军
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关键词 ：广域电磁法, 胶西北, 深部探测, 岩浆岩分布区, 焦家断裂带

Abstract：

Jiaojia and Sanshandao fault zones are famous gold ore-forming zones in Jiaoxibei region. In recent years, the deep exploration results are remarkable. At present, the borehole has reached the depth of 4 006 m. The previous geophysical exploration methods have poor deep exploration effect, so effective deep exploration geophysical technology is urgently needed. The wide field electromagnetic method is applied to the known section of Jiaojia and Sanshandao fault zones. The section reveals that the characteristics of the low resistance zone formed by the two major fault zones are obvious, which truly reflects the distribution of underground electricity; the distribution of apparent resistivity high resistance and low resistance reflects the distribution of Linglong granite body and metamorphic rock mass; meanwhile, the section clearly shows the intersection of the two major faults at a depth of 4 km. The section provides the basis for the fault characteristics between Sanshandao and Jiaojia faults. The application test shows that the wide area electromagnetic method has a large detection depth and strong anti-interference capability, and hence it is a good non-seismic geophysical method for detecting the low resistance fault zone in the magmatic rock distribution area of Jiaoxibei region.

Key words： wide field electromagnetic method Jiaoxibei region deep exploration magmatic rock distribution area Jiaojia fault zone

收稿日期: 2020-05-16 出版日期: 2020-10-26

P631

基金资助:山东省重大科技创新工程“深部探测综合地球物理技术”(2018CXGC1601)

作者简介: 王洪军(1972-),男,山东省齐河县人,高级工程师,主要从事勘探地球物理工作。 Email: hongjun@126.com

引用本文:

王洪军, 熊玉新. 广域电磁法在胶西北金矿集中区深部探测中的应用研究[J]. 物探与化探, 2020, 44(5): 1039-1047.
WANG Hong-Jun, XIONG Yu-Xin. The application of wide field electromagnetic method to deep exploration in Jiaoxibei (northwest Shandong) gold concentration area. Geophysical and Geochemical Exploration, 2020, 44(5): 1039-1047.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.0256 或 https://www.wutanyuhuatan.com/CN/Y2020/V44/I5/1039

Fig.1 胶东矿集区地质和金矿分布

Fig.2 研究区地质矿产简图
1—第四系;2—白垩纪郭家岭序列花岗闪长岩;3—侏罗纪玲珑序列黑云二长花岗岩;4—新太古代栖霞序列含角闪黑云英云闪长质片麻岩;5—新太古代马连庄序列中细粒变辉长岩(斜长角闪岩);6—石英脉;7—闪长玢岩脉;8—蚀变带;9—实测及推断断裂;10—钻孔编号及孔深;11—金矿床;12—广域电磁剖面

Table 1 研究区主要岩(矿)石电性参数统计

Fig.3 广域电磁场源布设示意

Fig.4 广域电磁法数据处理解释流程

Fig.5 GY-01线广域电磁法定性分析

Fig.6 GY-01线广域电磁法反演解释
1—第四系;2—侏罗纪玲珑序列黑云二长花岗岩;3—新太古代栖霞序列英云闪长质片麻岩;4—新太古代马连庄序列中细粒变辉长岩(斜长角闪岩);5—实测及推断断裂;6—含金蚀变带;7—推断含金蚀变带;8—钻孔位置及编号;9—钻孔深度(单位:m)

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