Magnetotelluric exploration of deep-seated gold deposits in the Qingchengzi orefield, Eastern Liaoning (China), using a SEP system

Di, Qingyun; Xue, Gang; Zeng, Qingdong; Wang, Zhongxing; An, Zhongfu; Lei, Da

doi:10.1016/j.oregeorev.2020.103501

Cited by 28 publications

(6 citation statements)

References 10 publications

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“…Notably, the electromagnetic methods often overestimate the scale of anomalous bodies [21,38], particularly that of metallic ore bodies to which the electromagnetic methods are sensitive. In other words, the electromagnetic methods can effectively detect large-scale metallic ore body, but it has some limitations in accurately distinguishing specific anomalies from anomalous assemblage in current studies [39,40]. This quality was demonstrated by the electromagnetic survey results (TEM and MT) obtained in this study.…”

Section: Discussionmentioning

confidence: 75%

Combined Magnetic, Transient Electromagnetic, and Magnetotelluric Methods to Detect a BIF-Type Concealed Iron Ore Body: A Case Study in Gongchangling Iron Ore Concentration Area, Southern Liaoning Province, China

Jia

Wang

2020

Minerals

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The detection and evaluation of concealed mineral resources deep in metallic mines and in the surrounding areas remain technically difficult. In particular, due to the complex topographic and geomorphic conditions on the surface, the detection environments in these areas limit the choices of detection equipment and data collection devices. In this study, based on metallogenic theory and the metallogenic geological characteristics of banded iron formation (BIF)-type iron ores, equipment for surface geophysical surveys (i.e., the high-precision ground magnetic survey method, the transient electromagnetic method, and the magnetotelluric method) and data collection devices capable of taking single-point continuous measurements were employed to detect the concealed iron ore bodies in the transition zone CID-1 between the Hejia and Dumu iron deposits in the Gongchangling iron ore concentration area in the Anshan-Benxi area (Liaoyang, China), a representative area of BIF-type iron ores. The results showed that an optimal combination of these geophysical survey methods accurately determined the anomalous planar spatial locations and anomalous profile morphologies of the concealed iron ore bodies. On this basis, we determined their locations, burial depths, and scales. Two anomalous zones induced by concealed iron ore bodies, YC-1 and YC-2, were discovered in zone CID-1. Two concealed iron-bearing zones, one shallow (0–150 m) and one deep (300–450 m), were found in YC-1. A 100 m scale drilling test showed that the cumulative thickness of the shallow iron-bearing zone was over 23.6 m.

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Section: Discussionmentioning

confidence: 75%

Combined Magnetic, Transient Electromagnetic, and Magnetotelluric Methods to Detect a BIF-Type Concealed Iron Ore Body: A Case Study in Gongchangling Iron Ore Concentration Area, Southern Liaoning Province, China

Jia

Wang

2020

Minerals

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“…The average distance between the MT sites outside the Ganzi fault was 5 km, and the sites at the Ganzi fault had a spacing of 1 km. The time series of two electric field components and three magnetic field components were recorded for over 20 h with a Phoenix MTU-5 system and Surface Electromagnetic Prospecting system [47] at the MT sites. The magnetic field components were detected by induction coil magnetic sensors, and the telluric field components were detected by nonpolarized Pb-PbCl 2 electrodes with an electrical dipole length of 50 m. The time series data of all MT sites were transformed into frequency-domain impedance tensors using SSMT2000 software with remote reference and statistically robust algorithms [48,49].…”

Section: Magnetotelluric Data and Analysismentioning

confidence: 99%

Crustal Electrical Structure of the Ganzi Fault on the Eastern Tibetan Plateau: Implications for the Role of Fluids in Earthquakes

Kong

Wang

et al. 2022

Remote Sensing

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The initiation and evolution of seismic activity in intraplate regions are controlled by heterogeneous stress and highly fractured rocks within the rock mass triggered by fluid migration. In this study, we imaged the electrical structure of the crust beneath the Ganzi fault using a three-dimensional magnetotelluric inversion technique, which is host to an assemblage of resistive and conductive features extending into the lower crust. It presents a near-vertical low-resistance zone that cuts through the brittle ductile transition zone, extends to the lower crust, and acts as a pathway for fluid migration from the crustal flow to the upper crustal depths. Conductors in the upper and lower crust are associated with saline fluids and 7% to 16% partial melting, respectively. The relationship between the earthquake epicenter and the surrounding electrical structure suggests that the intraplate seismicity is triggered by overpressure fluids, which are dependent on fluid volume changes generated by the decompression dehydration of partially molten material during upwelling and native fluid within the crustal flow.

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“…However, the currently known gold endowment of the Liaodong Peninsula (~500 t, Zeng et al ., 2019) is significantly lower than that in the Jiaodong Peninsula, which may be attributed to the lack of exploration data (Zhu et al ., 2015; Fan et al ., 2016). A considerable amount of research has been driven in recent years to investigate the three main goldfields in the Liaodong Peninsula (Figure 1b), including the Wulong (e.g., Liu et al ., 2018; Xiao et al ., 2018; Yu et al ., 2018; Feng et al ., 2019; Liu, Zhang, et al ., 2019; Chen et al ., 2020; Cheng et al ., 2020; Yu, Zeng, Frimmel, et al ., 2020; Yu, Zeng, Xia, et al ., 2020; Zhang et al ., 2020), Maoling (e.g., Zhang et al ., 2017; Liu et al ., 2018), and Qingchengzi goldfields (e.g., Liu, Liu, et al ., 2019; Sun et al ., 2019; Zhang et al ., 2019; Di et al ., 2020; Liu et al ., 2020; Sun, Zeng, Wang, et al ., 2020; Sun, Zeng, Zhou, et al ., 2020). The majority of the previous research focus on the timing, tectonic setting and metallogenetic model of the three main goldfields, however, little attention has been given to the satellite gold deposits outside the orefields.…”

Section: Introductionmentioning

confidence: 99%

A magmatic‐hydrothermal origin of the Xinfang gold deposit, Liaodong Peninsula, China, revealed by in‐situ S–Pb isotopes and trace element analyses of pyrite

Zeng

Frimmel

et al. 2021

Resource Geology

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The Xinfang deposit is a large gold deposit (>20 t of Au) on the southern edge of the Liaodong Peninsula, China. A total of 37 gold‐bearing orebodies are identified along NS‐ and NW‐striking faults and are mainly hosted by the Archean and Neoproterozoic metamorphic rocks. Three stages of hydrothermal mineralization are distinguished, including Stage I of dominant quartz ± pyrite (Py1), Stage II of quartz‐polymetallic sulfide (Py2), and Stage III of quartz‐calcite ± pyrite (Py3). Gold primarily occurs at the Stage II in association with intensive silicification, pyritization, and sericitization. Here, we report on high‐precision in‐situ LA‐MC‐ICP‐MS analyses of S and Pb isotopic compositions of the sulfide minerals and LA‐ICP‐MS analyses of trace element signature of the pyrite from the Xinfang gold deposit. The δ34S values of the sulfides range from 1.3 to 5.3‰, which is consistent with a magmatic origin of S. The sulfides yield 208Pb/204Pb, 207Pb/204Pb, and 206Pb/204Pb ratios of 37.497–37.773, 15.323–15.410, and 17.004–17.229, respectively, which deviate from the values of the wall rocks, suggesting an external Pb source. The in‐situ LA‐ICP‐MS spot analyses of the pyrite reveals that gold occurs in two generations of pyrite (Py2 and Py3) but at low concentrations (≤0.06 ppm for Py2, ≤0.24 ppm for Py3). Visible gold, however, only occurs in the Stage II assemblage as inclusions in pyrite and quartz, and is distributed along the margins or within the fractures of the sulfides. The Py2 shows high Co, Ni, and As concentrations and is depleted in other trace elements typical of a magmatic‐hydrothermal derivation. In contrast, Py3 exhibits low concentrations in most trace elements. Trace element mapping of Py2 revealed correlations between Fe and Co, as well as Ni and As, indicating their couped substitution in the pyrite structure. The available geological, petrographic and geochemical data consistently suggest that the Xinfang gold deposit formed during the Early Cretaceous by hydrothermal fluids of magmatic contribution.

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Magnetotelluric exploration of deep-seated gold deposits in the Qingchengzi orefield, Eastern Liaoning (China), using a SEP system

Cited by 28 publications

References 10 publications

Combined Magnetic, Transient Electromagnetic, and Magnetotelluric Methods to Detect a BIF-Type Concealed Iron Ore Body: A Case Study in Gongchangling Iron Ore Concentration Area, Southern Liaoning Province, China

Combined Magnetic, Transient Electromagnetic, and Magnetotelluric Methods to Detect a BIF-Type Concealed Iron Ore Body: A Case Study in Gongchangling Iron Ore Concentration Area, Southern Liaoning Province, China

Crustal Electrical Structure of the Ganzi Fault on the Eastern Tibetan Plateau: Implications for the Role of Fluids in Earthquakes

A magmatic‐hydrothermal origin of the Xinfang gold deposit, Liaodong Peninsula, China, revealed by in‐situ S–Pb isotopes and trace element analyses of pyrite

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