Location Prediction Study of Fluorite Ore in Shallow Cover Area: Evidence from Integrated Geophysical Surveys
Abstract
:1. Introduction
2. Regional Geological and Geophysical Characteristics
2.1. Regional Geology
2.2. Deposit Geology
2.3. Geophysical Characteristics of the Deposit
3. Integrated Geophysical Exploration and Processing
3.1. Ground Magnetic Method (GM)
3.2. Induced Polarization Method
3.3. Ore-Bearing Potential Detection Technology of Fluorite Ore in Shallow Covering Area
3.4. Audio Magnetotelluric Sounding
3.4.1. Data Acquisition and Processing
3.4.2. Two-Dimensional Inversion and Results
3.4.3. Three-Dimensional Inversion and Results
4. Discussion
4.1. Constraints of Integrated Geophysical Exploration Results on Hidden Fluorite Deposits
4.2. Method System of Shallow Coverage Area Positioning Prediction Technology
4.3. Formation Mechanism of Mineral Deposits
5. Conclusions
- Summarized the phased fluorite deposit positioning and prediction technology process in the shallow-covered areas of the Gobi Desert. Initially, GM and IP surveys were utilized to identify potential concealed ore-bearing fault structures, representing possible structures that control hydrothermal solution movement. Subsequently, PGR and PXRF were employed to constrain anomalies associated with potential mineralization within spatial occurrences of fluorite deposits. Finally, combining deep-seated information provided by electromagnetic detection with drilling and trenching verification led to discovering multiple concealed fluorite deposits, providing valuable references for positioning and predicting fluorite deposits in shallow-covered areas.
- The resistivity model constrained by the audio Magnetotelluric method, especially 3D inversion, was used to constrain the deep subsurface structures of known mineralized faults. The fluorite ore bodies of Huashitoushan are mainly located at the junction regions of high-resistivity sandstone formation and relatively high-conductivity fault/fissure alteration zones.
- Unlike the traditional geophysical detection of metal–sulfide deposits in shallow coverage areas, the physical properties of the ore body and the surrounding rocks are significantly different, and the prediction of fluorite ore positioning needs to be constrained by the combination of two phases of spatial detection of endowment and metallogenetic potential, as well as by a combination of various technological methods.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Rock Types | Samples | Magnetic Susceptibility SI (10−6) | |
---|---|---|---|
Range | Average | ||
Altered cataclastic rock | 10 | 1~5 | 3.34 |
Fluorite veins | 15 | 0~5 | 1.06 |
Granite | 10 | 36~179 | 81.3 |
Quartz sandstone | 16 | 3~20 | 8.7 |
Rock Types | Samples | ρ (Ω·m) | η (%) | ||||
---|---|---|---|---|---|---|---|
Minimum | Maximum | Average | Minimum | Maximum | Average | ||
Quartz sandstone | 5 | 4722 | 9398 | 7037 | 0.895 | 2.276 | 1.74 |
Quartz vein | 5 | 1978 | 10,712 | 5598 | 0.306 | 1.426 | 0.77 |
Tectonic breccia | 5 | 5403.3 | 5403.3 | 5403.3 | 1.02 | 2.82 | 1.82 |
Altered cataclastic rock | 5 | 6822.0 | 16,830.5 | 11,223.3 | 0.75 | 1.70 | 1.12 |
quaternary | 20 | 3 | 52 | 18.72 |
Lithology | Tc/10−6 | Deposit Location | |
---|---|---|---|
Variation Interval | Mean Value | ||
granite | 35.4~99.3 | 65.9 | Southern Songxian County, Henan Province, China |
Rhyolite porphyry | 25.6~70.3 | 50.1 | |
Altered granite | 40.6~95.1 | 62.3 | |
Altered rhyolite | 21.0~72.3 | 48.9 | |
Massive fluorite ore | 11.2~40.0 | 23.0 | |
Cemented fluorite ore | 13.0~48.3 | 25.8 | |
Banded fluorite ore | 14.2~45.5 | 27.3 | |
Quartz–fluorite ore | 15.8~50.4 | 26.5 | |
Fine vein fluorite ore | 14.1~73.4 | 37.6 | |
sand slate | 9.4~25.0 | 15.9 | Linxi County, Inner Mongolia, China |
fluorite ore | 4.5~8.9 | 6.3 | |
limestone | 6.7~20.0 | 11.03 | Pengshui County, Chongqing, China |
fluorite ore | 0.9~7.4 | 3.86 |
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Cheng, L.; Han, L.; Kai, Y.; Yongbao, G.; Weidong, T.; Chuan, Y. Location Prediction Study of Fluorite Ore in Shallow Cover Area: Evidence from Integrated Geophysical Surveys. Minerals 2024, 14, 838. https://doi.org/10.3390/min14080838
Cheng L, Han L, Kai Y, Yongbao G, Weidong T, Chuan Y. Location Prediction Study of Fluorite Ore in Shallow Cover Area: Evidence from Integrated Geophysical Surveys. Minerals. 2024; 14(8):838. https://doi.org/10.3390/min14080838
Chicago/Turabian StyleCheng, Liu, Li Han, Yang Kai, Gao Yongbao, Tang Weidong, and Yao Chuan. 2024. "Location Prediction Study of Fluorite Ore in Shallow Cover Area: Evidence from Integrated Geophysical Surveys" Minerals 14, no. 8: 838. https://doi.org/10.3390/min14080838