Fine-scale prospecting targets of skarn iron deposits in the Pandian gravity-magnetic anomaly zone of northwestern Shandong Province: Insights from deep prospecting using the wide-field electromagnetic method
GUO Guo-Qiang1,2,3(), LI Ya-Dong4, WANG Yang1,2,3, YU Jia-Bin1,2,3, WANG Run-Sheng1,2,3, GAO Xiao-Feng1,2,3, ZHANG Da-Ming5, HU Dong-Ning1,2,3, FANG Lei1,2,3, GUO Wei-Fang1,2,3
1. Shandong Institute of Geophysical and Geochemical Exploration, Jinan 250013, China 2. Shandong Provincial Engineering Research Center for Geological Prospecting, Jinan 250013, China 3. Shandong Engineering Research Center of Underground Resources and Environment High Precision Detection,Jinan 250013,China 4. No1. Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources,Jinan 250109,China 5. Geophysical Survey Team of Hebei Province Coal Geological Bureau,Xingtai 054000,China
Significant aeromagnetic and gravity anomalies were found in the ultra-deep coverage zone of the Pandian area in the northwestern Shandong Province. Through systematic verification of gravity and magnetic anomalies, a breakthrough in prospecting for deep skarn iron deposits has been achieved through several boreholes around the Pandian gravity-magnetic anomaly zone. However, the gravity-magnetic anomaly zone spreads extensively and its characteristics cannot directly indicate the prospecting target, thus some boreholes failed to find ores or revealed poor ore-finding conditions. Hence, to accurately delineate the ore-forming location in the gravity-magnetic anomaly zone and achieve a further breakthrough in ore prospecting, this study conducted the wide-field electromagnetic (WFEM) sounding in the verified Pandian gravity-magnetic anomaly zone. Combining the drilling verification, this study delineated the deep ore-forming interval of skarn iron deposits in the deep coverage zone and the favorable structural plane for ore-forming, suggesting the deep fine-scale prospecting targets.
Guo-Qiang GUO,Ya-Dong LI,Yang WANG, et al. Fine-scale prospecting targets of skarn iron deposits in the Pandian gravity-magnetic anomaly zone of northwestern Shandong Province: Insights from deep prospecting using the wide-field electromagnetic method[J]. Geophysical and Geochemical Exploration,
2024, 48(2): 327-333.
Lyu Q T, Zhang X P, Tang J T, et al. Review on advancement in technology and equipment of geophysical exploration for metallic deposits in China[J]. Chinese Journal of Geophysics, 2019, 62(10):3629-3664.
He J S. New research progress in theory and application of wide field electromagnetic method[J]. Geophysical and Geochemical Exploration, 2020, 44(5):985-990.
Liu J X, Zhao R, Guo Z W. Research progress of electromagnetic methods in the exploration of metal deposits[J]. Progress in Geophysics, 2019, 34(1):151-160.
Li D Q, Hu Y F. A comparison of wide field electromagnetic method with CSAMT method in strong interferential mining area[J]. Geophysical and Geochemical Exploration, 2015, 39(5):967-972.
Liu Z X, Xue G Q, Zhang L B. Comparison and analysis on effective observation area of tensor CSAMT by numerical simulation method[J]. Chinese Journal of Geophysics, 2017, 60(8):3278-3287.
Tang J T, Ren Z Y, Zhou C, et al. Frequency-domain electromagnetic methods for exploration of the shallow subsurface:A review[J]. Chinese Journal of Geophysics, 2015, 58(8):2681-2705.
Liu C M, Tong T G, He J S. Exploration of various electromagnetic method in some gold mine[J]. The Chinese Journal of Nonferrous Metals, 2013, 23(9):2422-2429.
Zhu Y Z, Xu C Y. The experimental application of wider field electromagnetic method to the prospectiang for deep ore deposits[J]. Geophysical and Geochemical Exploration, 2011, 35(6):743-746.
Tian H J, Zhang G D, Liu G D, et al. The application effect of the wide field electromagnetic method in geothermal exploration of Tailong area,northern Guizhou Province[J]. Geophysical and Geochemical Exploration, 2020, 44(5):1093-1097.
Wang H Y, Li D Q, Liu J X, et al. Application of wide-field electromagnetic method in the detection of oil-rich enrichment areas in the southwestern margin of the Ordos Basin[J]. Progress in Geophysics, 2020, 35(3):1038-1047.
Wang J C, Zhao Z G, Gao S Y, et al. Application of a comprehensive geophysical exploration methods in the exploration of geothermal resources in Yueliangwan,Binhai County[J]. Geophysical and Geochemical Exploration, 2023, 47(2):321-330.
Liu C W, Wang C, Hu C P, et al. Application of a comprehensive geophysical exploration methods to water exploration in magmatic rock mountainous areas with water shortage in Jiaodong Peninsula[J]. Geophysical and Geochemical Exploration, 2023, 47(2):512-522.
[15]
Wang J L, Lin P R, Wang M, et al. A multiple parameter extraction and electromagnetic coupling correction technique for time domain induced polarisation full waveform data[J]. Exploration Geophysics, 2019, 50:113-123.
Wang R S, Hao X Z, Chen D L, et al. Discussion on the boundary of metallogenic geological body of skarn type iron deposits and study on its deep characteristics in Qihe-Yucheng area,Shandong Province[J]. Progress in Geophysics, 2022, 37(1):59-68.
Meng X H, Wang J, Liu G F, et al. Geophysical response characteristics of the Dapai polymetallic mining area in Southwestern Fujian Province and its prospecting implications[J]. Chinese Journal of Geophysics, 2021, 64(3):949-964.
Wang Q S, Zhang J H, You M, et al. Detecting steeply inclined gold deposits in thick-covered areas buy using current magnetic field method[J]. Progress in Geophysics, 2021, 36(1):281-289.
Zhang L M, Ling D D. Application of high precision magnetic measurement in the study of metallogenic regularity of multi-metallic ore deposit exploration area[J]. Progress in Geophysics, 2019, 34(3):1145-1152.
Ding W X, Yuan F, Li X H, et al. Deep geological structure analysis and metallogenic prediction of zhonggu ore field in the south section of Ningwu Basin based on gravity and magnetic joint inversion[J]. Acta Geologica Sinica, 2018, 92(11):2301-2317.
Wang R S, Hao X Z, Liu H B, et al. Study on prospecting law of skarn type iron deposit by gravity and magnetic method in Qihe area of western Shandong[J]. Progress in Geophysics, 2022, 37(2):664-677.
