广域电磁法在北秦岭蟒岭矿集区深部找矿中的应用——以腰庄矿区为例

doi:10.11720/wtyht.2024.0056

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摘要

蟒岭矿集区岩浆活动强烈,是近年来北秦岭构造带深部找矿的热点地区,区内钼矿的形成与晚侏罗世酸性小岩体关系密切。为实现该区深部找矿突破,本文在重力异常圈定的腰庄隐伏岩体上开展了广域电磁法测量。测量结果显示,深部存在明显的高阻异常,推断高阻异常的凸起部位为腰庄隐伏岩体;其电阻率反演结果基本刻画了该岩体的顶面变化特征,推断顶面海拔介于-300~620 m、南北宽度1 300~1 600 m。通过对优选出的深部成矿有利部位进行钻探验证,揭示了隐伏岩体和隐伏钼矿体的存在。结果表明,广域电磁法探测深度大、分辨率高,是蟒岭矿集区深部找矿的有效勘查方法。

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	张晓团
	李新林
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	高维强

关键词 ：广域电磁法, 深部找矿, 蟒岭矿集区, 北秦岭, 钼矿体

Abstract：

The Mangling ore concentration area with intense magmatic activity has become a focal area for deep prospecting in the North Qinling tectonic belt in recent years. The formation of molybdenum deposits in this area is closely related to small Late Jurassic acidic intrusions. To achieve breakthroughs in deep ore prospection within this area, this study conducted the wide-field electromagnetic sounding over the concealed Yaozhuang intrusion delineated based on gravity anomalies. The results indicate the presence of pronounced high-resistivity anomalies at depth, and it is inferred that the protruding part of the anomalies corresponds to the concealed Yaozhuang intrusion. The resistivity inversion results roughly delineated the variations in the top surface of the intrusion, with the elevations and N-S width of the top surface estimated at -300~620 m and 1300~1600 m, respectively. Drilling in the most favorable deep mineralized part confirmed the presence of the concealed intrusion and concealed molybdenum ore bodies. The results of this study demonstrate that the wide-field electromagnetic sounding method exhibits great sounding depths and high resolutions, serving as an effective method for deep ore prospecting in the Mangling ore concentration area.

Key words： wide-field electromagnetic method(WFEM) deep exploration Mangling ore concentration area North Qinling molybdenum ore body

收稿日期: 2024-02-20 修回日期: 2024-09-03 出版日期: 2024-12-20

ZTFLH:

P631

基金资助:陕西省地质勘查基金项目(61201908334);陕西省公益性地质调查项目(202112);陕西省公益性地质调查项目(202308)

通讯作者: 李新林(1966-),男,正高级工程师,现从事矿产勘查工作。Email:541475896@qq.com

引用本文:

张晓团, 李新林, 周斌, 高维强. 广域电磁法在北秦岭蟒岭矿集区深部找矿中的应用——以腰庄矿区为例[J]. 物探与化探, 2024, 48(6): 1609-1617.
ZHANG Xiao-Tuan, LI Xin-Lin, ZHOU Bin, GAO Wei-Qiang. Application of wide-field electromagnetic sounding method to deep prospecting in the Mangling ore concentration area in North Qinling: A case study of the Yaozhuang ore district. Geophysical and Geochemical Exploration, 2024, 48(6): 1609-1617.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.0056 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I6/1609

Fig.1 蟒岭矿集区区域地质简图
1—中—新元古界宽坪岩群;2—晚侏罗世二长花岗岩;3—晚侏罗世花岗斑岩;4—晚侏罗世闪长岩;5—晚侏罗世隐爆角砾岩;6—晚侏罗世闪长玢岩;7—断裂;8—钼矿;9—铅锌矿/铜铅锌矿;10—铜矿;11—腰庄矿区

Fig.2 腰庄矿区地质简图
1—中—新元古界谢湾岩组;2—中—新元古界四岔口岩组;3—中—新元古界广东坪岩组;4—晚侏罗世二长花岗岩;5—晚侏罗世花岗斑岩;6—晚侏罗世闪长玢岩;7—黄铁矿化硅化蚀变岩;8—石英脉;9—铅锌矿体;10—钼钨矿体;11—断层;12—产状;13—腰庄隐伏岩体范围;14—广域电磁法推断钼成矿有利区;15—广域电磁法剖面点位、线号及点号;16—0号勘探线剖面;17—已验证钻孔;18—设计钻孔

Table 1 研究区岩石电性参数统计结果

Fig.3 广域电磁场源布设示意
1—广域电磁法剖面及编号;2—供电极距;3—腰庄隐伏岩体范围;4—高压线

Fig.4 试验点电场和视电阻率随频率变化曲线

Fig.5 GY04剖面视电阻率综合断面

Fig.6 广域电磁法GY04反演电阻率剖面(a)和地质解释(b)

Fig.7 广域电磁法GY05反演电阻率剖面(a)和地质解释(b)

Fig.8 腰庄矿区0号勘探线综合断面图(据周斌等^[28]修改)

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