An analysis of the effect of multiple geophysical prospecting methods in the deep exploration of the Jiaoxibei (northwest Shandong) gold ore concentration area
WANG Hong-Jun1(), TIAN Hong-Jun2(), HE Chun-Yan1, LIU Guang-Di3
1.Shandong Institute of Geophysical and Chemical Exploration and Exploration,Jinan 250109,China 2.Sichuan Zhongcheng Coal Field Geophysical Engineering Research Institute Co.,Ltd.,Chengdu 610072,China 3.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China
In order to establish a geological-geophysical prospecting model suitable for the deep gold deposits in Jiaoxibei region of Shandong,the authors performed a variety of electromagnetic exploration technologies on known geological sections,and selected a deep geophysical exploration method suitable for the concentrated gold deposits in the strong interference zone of Jiaoxibei region.The contrasting and analyzing of the exploration results of wide field electromagnetic method,magnetotelluric method (MT),controlled source audio-frequency magnetotelluric method (CSAMT) and spectrum IP method (SIP) show that,compared with MT,the wide area electromagnetic method has the advantages of high resolution,high data accuracy,strong anti-interference capability and high construction efficiency,and compared with CSAMT and SIP,the wide area electromagnetic method has large exploration depth and strong anti-interference capability,high data accuracy and other technical advantages.Various methods can reveal the spatial distribution characteristics of strata,rock masses and fault alteration zones within 2km of the profile line,but fail to provide deep physical parameters.In contrast,the results of the wide field electromagnetic method not only show the changing rules and characteristics of the shallow central resistivity,but also effectively reflect the changing characteristics of the deep fault alteration zone.The results show that the wide-area electromagnetic method is an effective exploration method in this comprehensive geophysical research,and it also provides accurate geophysical parameters for deep mineralization prediction and model establishment.
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WANG Hong-Jun, TIAN Hong-Jun, HE Chun-Yan, LIU Guang-Di. An analysis of the effect of multiple geophysical prospecting methods in the deep exploration of the Jiaoxibei (northwest Shandong) gold ore concentration area. Geophysical and Geochemical Exploration, 2020, 44(5): 1053-1058.
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