Abstract
The Lushi gold polymetallic ore-concentration area, located in the southern margin of North China Craton, is an important polymetallic ore district in the Qinling metallogenic belt. The Jianbeigou gold deposit is an important quartz vein type gold deposit in this district. In order to reveal the geological structure of the Jianbeigou gold deposit to guide deep prospecting, the EH4 conductivity image system was used in the Jianbeigou area. The sections obtained by the audio magnetotellurics method (AMT) indicate that the steeply dipping low resistivity zone in the area has a good corresponding relationship with the location of the known shallow ore bodies, and an extension in the deep. The low resistivity anomaly zone obtained by the inversion results are well correlated with the gold mineralization zone of the ore bodies, indicating good deep prospecting and exploration potential in this area. Based on geological and geophysical evidences, this paper inferred the possible occurrence location and depth range of the buried ore bodies. The AMT survey results reflect good exploration potential of the mining area and provide a geophysical basis for deep prospecting.
Highlights
The Qinling metallogenic belt, situated in the southern margin of the North ChinaCraton (NCC), is one of the most important Au-Mo polymetallic ore belts in China, which is characterized by voluminous gold, molybdenum, and lead-zinc polymetallic deposits [1,2,3].The Qinling metallogenic belt was formed under the complex crust–mantle interactions and the diverse metallogenic processes
The shallow part of the low resistivity zone has a secondary low resistivity zone that slopes northward, and the deep part slopes steeply toward the north, extending to a depth of 1000 m. These findings show that the ore body has a structural extension in the deep
In the exploration work of this research, the EH4 conductivity image system successfully identified the differences in resistivity between the host rock and the ore bodies
Summary
The Qinling metallogenic belt, situated in the southern margin of the North ChinaCraton (NCC), is one of the most important Au-Mo polymetallic ore belts in China, which is characterized by voluminous gold, molybdenum, and lead-zinc polymetallic deposits [1,2,3].The Qinling metallogenic belt was formed under the complex crust–mantle interactions and the diverse metallogenic processes. The Qinling metallogenic belt, situated in the southern margin of the North China. Craton (NCC), is one of the most important Au-Mo polymetallic ore belts in China, which is characterized by voluminous gold, molybdenum, and lead-zinc polymetallic deposits [1,2,3]. The Qinling metallogenic belt, which is one of the largest large-scale deposit accumulation areas in the world, has attracted much attention due to its huge resource potential. The Qinling metallogenic belt is regarded as a good metallogenic condition and exploration potential region [7]. The surface conditions of the Qinling metallogenic belt are complex and changeable, such as extensively developed surface folds and faults, mostly high-steep structures, harsh survey environments, and difficult field construction. Compared with other geophysical prospecting methods, the audio magnetotellurics method (AMT) has the unique advantages
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