Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics
The evolution of metamorphic core complexes is closely related to gold formation. Due to the thick cover and orebodies’ lying depth, exploration regularities, and metallogenic prediction have faced challenges. Therefore, new data were obtained through controlled-source audio magnetotelluric (MT) and...
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De Gruyter
2024-10-01
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| Series: | Open Geosciences |
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| Online Access: | https://doi.org/10.1515/geo-2022-0686 |
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| author | Zhihe Xu Bin Shi Weiqing Fan Weidong Li Xuguang Wei Guangxiang Li Naichen Wang Zhongjie Yang |
| author_facet | Zhihe Xu Bin Shi Weiqing Fan Weidong Li Xuguang Wei Guangxiang Li Naichen Wang Zhongjie Yang |
| author_sort | Zhihe Xu |
| collection | DOAJ |
| description | The evolution of metamorphic core complexes is closely related to gold formation. Due to the thick cover and orebodies’ lying depth, exploration regularities, and metallogenic prediction have faced challenges. Therefore, new data were obtained through controlled-source audio magnetotelluric (MT) and broadband MT methods to predict the ore-bearing properties at depth and decipher the spatial coupling relationship, respectively. The results of broadband MT surveys allow us to identify the thick cover (apparent resistivity of 3,000 Ω m), the strongly deformed metamorphic rock (apparent resistivity of 18,000 Ω m), and two low-angle detachment faults (apparent resistivity from 5,000 to 8,000 Ω m). The fault-dip value on the left side is roughly 30°, while on the other side, the values significantly change from 30° to 75°, although they are in the same structure. Moreover, the controllable source audio MT method provides more detailed examinations of the right side fault. The proved ore-bearing gold orebodies were all located in the transition zone where the inclination angle changes from steep to gentle or gentle to steep. The discovery of this mineralization pattern allows us to evaluate the mining prospecting potential and predict the deep-seated metallogenic location. Based on the geotectonic environment and the geophysical profiles, we conclude that the coeval exhumation of the metamorphic core complex with non-symmetrical northwest-southeast shear senses may have resulted from a decratonization event during the retreat of the Paleo-Pacific Plate. |
| format | Article |
| id | doaj-art-643e8b63f3a24bfab2c97d4251159fad |
| institution | OA Journals |
| issn | 2391-5447 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | De Gruyter |
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| series | Open Geosciences |
| spelling | doaj-art-643e8b63f3a24bfab2c97d4251159fad2025-08-20T01:53:30ZengDe GruyterOpen Geosciences2391-54472024-10-0116112710.1515/geo-2022-0686Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagneticsZhihe Xu0Bin Shi1Weiqing Fan2Weidong Li3Xuguang Wei4Guangxiang Li5Naichen Wang6Zhongjie Yang7College of Earth Sciences, Institute of Disaster Prevention, Sanhe city, 065201, ChinaMudanjiang Natural Resources Comprehensive Survey Center of China, Geological Survey, Mudanjiang, ChinaCollege of Earth Sciences, Institute of Disaster Prevention, Sanhe city, 065201, ChinaElectromagnetic Department, Jilin Exploration Geophysics Institute, Changchun, 130012, ChinaElectromagnetic Department, Jilin Exploration Geophysics Institute, Changchun, 130012, ChinaElectromagnetic Department, Jilin Exploration Geophysics Institute, Changchun, 130012, ChinaElectromagnetic Department, Jilin Exploration Geophysics Institute, Changchun, 130012, ChinaMudanjiang Natural Resources Comprehensive Survey Center of China, Geological Survey, Mudanjiang, ChinaThe evolution of metamorphic core complexes is closely related to gold formation. Due to the thick cover and orebodies’ lying depth, exploration regularities, and metallogenic prediction have faced challenges. Therefore, new data were obtained through controlled-source audio magnetotelluric (MT) and broadband MT methods to predict the ore-bearing properties at depth and decipher the spatial coupling relationship, respectively. The results of broadband MT surveys allow us to identify the thick cover (apparent resistivity of 3,000 Ω m), the strongly deformed metamorphic rock (apparent resistivity of 18,000 Ω m), and two low-angle detachment faults (apparent resistivity from 5,000 to 8,000 Ω m). The fault-dip value on the left side is roughly 30°, while on the other side, the values significantly change from 30° to 75°, although they are in the same structure. Moreover, the controllable source audio MT method provides more detailed examinations of the right side fault. The proved ore-bearing gold orebodies were all located in the transition zone where the inclination angle changes from steep to gentle or gentle to steep. The discovery of this mineralization pattern allows us to evaluate the mining prospecting potential and predict the deep-seated metallogenic location. Based on the geotectonic environment and the geophysical profiles, we conclude that the coeval exhumation of the metamorphic core complex with non-symmetrical northwest-southeast shear senses may have resulted from a decratonization event during the retreat of the Paleo-Pacific Plate.https://doi.org/10.1515/geo-2022-0686north china cratonmetamorphic core complexductile shear zonegold depositgeophysical method |
| spellingShingle | Zhihe Xu Bin Shi Weiqing Fan Weidong Li Xuguang Wei Guangxiang Li Naichen Wang Zhongjie Yang Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics Open Geosciences north china craton metamorphic core complex ductile shear zone gold deposit geophysical method |
| title | Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics |
| title_full | Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics |
| title_fullStr | Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics |
| title_full_unstemmed | Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics |
| title_short | Spatial coupling relationship between metamorphic core complex and gold deposits: Constraints from geophysical electromagnetics |
| title_sort | spatial coupling relationship between metamorphic core complex and gold deposits constraints from geophysical electromagnetics |
| topic | north china craton metamorphic core complex ductile shear zone gold deposit geophysical method |
| url | https://doi.org/10.1515/geo-2022-0686 |
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