Abstract
The Qingchengzi orefield is an important polymetallic ore concentration zone in the northern margin of the North China Craton (NCC). The region has significant metallogenic potential for deep mining. Many areas with gold mineralization have been found in the shallow area of Taoyuan–Xiaotongjiapuzi–Linjiasandaogou in the east of the Qingchengzi orefield. To assess the distribution of mineralization levels, we carried out deep exploration using the transient electromagnetic method (TEM). A superconductive quantum interference device (SQUID) magnetometer and a conventional induction coil were used for field data acquisition. The SQUID data inversion results reflect the bottom interface of the high-conductivity area, the fold state of the underlying dolomite marble stratum, and the deep structural characteristics of the syncline. Secondary crumples appear in the inversion results of the southern segment of TEM, which is inferred as a favorable area for deep gold mineralization. Negative values appear in the SQUID data of some stations, to varying degrees. This induced polarization phenomenon may be related to deep gold mineralization.
Highlights
It is necessary to refine the detection of the deep geological structure to provide an effective basis for deep gold mineralization
This paper attempts to obtain the structural information related to deep gold mineralization through the application of high-temperature superconductive quantum interference device (SQUID) transient electromagnetics(TEM)
The conductivity of the underground medium can be obtained by observing the attenuation of the secondary of the underground medium can be obtained by observing the attenuation of the secondfield with a transient electromagnetic method (TEM) sensor
Summary
A small number of CSAMT (Controlled source audiofrequency magnetotelluric method) and IP (Induced polarization) projects are used for shallow target detection [7,8]. A comprehensive survey of airborne magnetotelluric, airborne transient electromagnetic, and airborne magnetic methods has been carried out in the Qingchengzi ore concentration area [1,10]. The nature, spatial distribution, and deep characteristics of the ore-controlling structures and faults in this mining area are still not clear. It is necessary to refine the detection of the deep geological structure to provide an effective basis for deep gold mineralization. This paper attempts to obtain the structural information related to deep gold mineralization through the application of high-temperature superconductive quantum interference device (SQUID) transient electromagnetics(TEM)
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