Three‐dimensional electrical exploration methods for the mapping of polymetallic targets in Gansu Province, China

Gong, Shengping; Yang, Yabin; Lin, Ping; Wu, Wei; Zheng, Caijun; Shi, Fusheng; Wu, Xiaoping; Weng, Aihua; Zhang, Guangzhi; Gu, Guanwen; Ye, Yixin

doi:10.1111/1365-2478.12787

Cited by 6 publications

(4 citation statements)

References 29 publications

(31 reference statements)

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“…Therefore, we use 3D inversion interpretation methods to inverse the MT dataset. In recent years, a number of MT 3D inversion algorithms have been developed and become more common in field data inversions (Mackie et al ., 2001; Siripunvaraporn et al ., 2005; Xiao et al ., 2010; Zhang et al ., 2015a, 2017a; Gong et al ., 2019). In this paper, the 3D MT data inversion was performed with the modified electromagnetic inversion code ModEM, utilizing the nonlinear conjugate gradient optimizing approach (Egbert and Kelbert, 2012; Kelbert et al ., 2014).…”

Section: Data Inversionmentioning

confidence: 99%

Three‐dimensional electrical structure of the northwestern margin of the Karamay region, China, revealed by magnetotelluric data

Gong

Hao

et al. 2020

Geophysical Prospecting

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In order to investigate the three-dimensional structures of intrusive granite and the deep structure of the Darbut fault in the northwestern margin of the Karamay region, western Junggar Basin, China, new magnetotelluric data were collected along six profiles across the Darbut fault. The magnetotelluric data were processed using a robust estimation technique to obtain the magnetotelluric impedance. Then the off-diagonal components of the impedance tensor were inverted using a three-dimensional nonlinear conjugate gradient inversion technique, which was performed using open-source three-dimensional electromagnetic inversion software. The final three-dimensional model includes two major low-resistivity anomalies and two major high-resistivity anomalies. The first low-resistivity anomaly corresponds to the location of the Darbut fault, which indicates that metallic elements are abnormally enriched there. The second one is located beneath the Darbut fault, and it is most likely a magma channel in the middle crust. The two major high-resistivity anomalies are distributed on either side of the Darbut fault. We interpret them as Karamay rocks and Akebasitao rocks and suggest that they were formed in an extensional setting. The cross sections of three-dimensional magnetotelluric inversion result reveal that the Darbut fault has been reformed by the later magmatism, leading to the variation of its downward extent along its strike. Moreover, our inversion result also indicates that a magma channel exists in the middle crust of the region.

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Section: Data Inversionmentioning

confidence: 99%

Three‐dimensional electrical structure of the northwestern margin of the Karamay region, China, revealed by magnetotelluric data

Gong

Hao

et al. 2020

Geophysical Prospecting

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“…Electromagnetic method has always been an important part of geophysical exploration, which is widely used in the field of electromagnetic exploration, involving in hydrology, geology, mine safety, archeological research, marine exploration, energy exploration and other fields [1][2][3][4]. In the aspect of electromagnetic transmitter, the electrical source transmitter includes TXU-30, a transmitter for V8 multi-function electrical instrument of Phoenix geophysics company of Canada [5,6], with a transmission parameters of 1000 V/20 A or 500 V/40 A.…”

Section: Introductionmentioning

confidence: 99%

Voltage Equalizing Strategy for Cascaded Constant Current Power Supply

Zhang,

Shi,

2024

IEEJ Transactions Elec Engng

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In order to detect the underground medium with large depth, the transmitter of electromagnetic sounding instrument has higher and higher power and voltage. A novel voltage equalizing strategy for cascaded constant current power supply using in electromagnetic transmitter was proposed in this paper. The cascaded topology of the transmitter has two isolated full‐bridge AC/DC converters, which had same input source and were connected in series on the output side. The mathematical model based on state space average method was analyzed. After simplifying the circuit, the state space equation was used to describe the circuit model. The stability and frequency characteristics of the system were analyzed. Aiming at the constant current output and the output voltage balance of the two converters, the system coupling model was established. The constant current controller and voltage equalizing controller were designed with decoupling method. A 300 W prototype was built and the experimental results verified the performance of the proposed method. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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“…Bournas et al [32] and Sun et al [33] carried out 3D data acquisition using a pole-L-shaped-dipole array (Figure 1c). Wang et al [4] and Gong et al [34] proposed using an expanding gradient-L-shaped-dipole array. Distributed true 3D acquisition technology is suitable for large-scale and high-precision mineral exploration.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Resistivity and Chargeability Tomography with Expanding Gradient and Pole–Dipole Arrays in a Polymetallic Mine, China

Wang,

Lin

et al. 2024

Remote Sensing

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Three-dimensional resistivity/chargeability tomography based on distributed data acquisition technology is likely to provide abundant information for mineral exploration. To realize true 3D tomography, establishing transmitter sources with different injection directions and collecting vector signals at receiver points is necessary. We implemented 3D resistivity/ chargeability tomography to search for new ore bodies in the deep and peripheral areas of Huaniushan, China. A distributed data acquisition system was used to form a vector receiver array in the survey area. First, by using the expanding gradient array composed of 11 pairs of transmitter electrodes, we quickly obtained the 3D distributions of the resistivity and chargeability of the whole area. Based on the electrical structure and geological setting, a NE-striking potential area for mineral exploration was determined. Next, a pole–dipole array was employed to depict the locations and shapes of the potential ore bodies in detail. The results showed that the inversion data for the two arrays corresponded well with the known geological setting and that the ore veins controlled by boreholes were located in the low-resistivity and high-chargeability zone. These results provided data for future mineral evaluation. Further research showed that true 3D tomography has obvious advantages over quasi-3D tomography. The expanding gradient array, characterized by a good signal strength and field efficiency, was suitable for the target determination in the early exploration stage. The pole–dipole array with high spatial resolution can be used for detailed investigations. Choosing a reasonable data acquisition scheme is helpful to improve the spatial resolution and economic efficiency.

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Three‐dimensional electrical exploration methods for the mapping of polymetallic targets in Gansu Province, China

Cited by 6 publications

References 29 publications

Three‐dimensional electrical structure of the northwestern margin of the Karamay region, China, revealed by magnetotelluric data

Three‐dimensional electrical structure of the northwestern margin of the Karamay region, China, revealed by magnetotelluric data

Voltage Equalizing Strategy for Cascaded Constant Current Power Supply

Three-Dimensional Resistivity and Chargeability Tomography with Expanding Gradient and Pole–Dipole Arrays in a Polymetallic Mine, China

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