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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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

Received: 20 February 2024 Published: 08 January 2025

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	Xiao-Tuan ZHANG
	Xin-Lin LI
	Bin ZHOU
	Wei-Qiang GAO

Cite this article:

Xiao-Tuan ZHANG,Xin-Lin LI,Bin ZHOU, et al. 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[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1609-1617.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0056 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1609

The geological sketch map of the Mangling ore concentration area
1—Neo-Mesoproterozoic Kuanping rock group;2—late Jurassic monzogranite;3—late Jurassic granite porphyry;4—late Jurassic diorite;5—late Jurassic phreatic breccia;6—late Jurassic diorite porphyry;7—fault;8—molybdenum deposit;9—lead-zinc deposit/copper-lead-zinc deposit;10—copper deposit;11—Yaozhuang ore district

Simplified geological map of Yaozhuang ore district
1—Neo-Mesoproterozoic Xiewan Formation;2—Neo-Mesoproterozoic Sichakou Formation;3—Neo-Mesoproterozoic Guangdongping Formation;4—late Jurassic monzogranite;5—late Jurassic granite porphyry;6—late Jurassic diorite porphyry;7—pyrite silicified altered rock;8—quartz vein;9—lead-zinc ore body;10—molybdenum-tungsten ore body;11—fault;12—occurrence;13—Yaozhuang concealed intrusion;14—metallogenetic prospective areas of molybdenum by WFEM;15—WFEM profile station, number of line and point;16—exploration line 0 profile;17—experimental verification drill hole;18—design drill hole

Electrical parameter statistic of rock in the research area

Schematic diagram of wide field electromagnetic work layout
1—WFEM profile;2—power supply pole distance;3—Yaozhuang concealed intrusion;4—high-tension line

Frequency variation curves following electrical field and apparent resistivity curves at experimental points

Apparent resistivity comprehensive section of GY04 profile

Inversion resistivity section(a)and geological interpretation (b)of GY04 by WFEM

Inversion resistivity section(a)and geological interpretation (b)of GY05 by WFEM

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Comprehensive cross-sectional map of exploration line 0 in the Yaozhuang ore district(modified by Zhou et al. ^[28])

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