Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data
Epithermal deposits represent a significant category of gold occurrences, with their subsurface structure playing a key role in reserve assessments. Fujian Province, characterized by extensive Mesozoic volcanic activities, stands out as a noteworthy region for shallow hydrothermal mineralization in...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/14/1/27 |
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| author | Huanyin He Jinrong Wang Wu Wen Rencong Tian Jiansui Lin Weiqiang Huang Yabin Li |
| author_facet | Huanyin He Jinrong Wang Wu Wen Rencong Tian Jiansui Lin Weiqiang Huang Yabin Li |
| author_sort | Huanyin He |
| collection | DOAJ |
| description | Epithermal deposits represent a significant category of gold occurrences, with their subsurface structure playing a key role in reserve assessments. Fujian Province, characterized by extensive Mesozoic volcanic activities, stands out as a noteworthy region for shallow hydrothermal mineralization in China. This paper focus on the Youxi area within Fujian Province, employing the dual-frequency induced polarization method (DFIP) and controlled-source audio-frequency magnetotelluric method (CSAMT) to investigate the target ore. The DFIP results revealed predominant northeast-oriented zones with high polarizability and notable apparent resistivity. The CSAMT data were inverted using the SCS2D software. Two-dimensional resistivity profiles reveal a three-layer electrical structure, comprising subsurface banded rhyolites influenced by fault zones, intermediate-low resistivity sandstone layers, and deep-seated high-resistivity conglomerates. The resistivity gradient zones and highly polarizable locations align closely with known local faults. We interpreted these resistivity gradient zones as prospective target areas for mineralization, a hypothesis subsequently validated by drilling results. Combining geochemical analyses of epithermal gold deposits with the electrical resistivity structure, we propose an explanatory model for the mechanism of the formation of epithermal gold–silver deposits in the Youxi area. The magmatic hydrothermal fluids ascended along the fault, underwent convection-driven interaction with meteoric waters, and subsequently metasomatized the host rocks. This integrated approach provides valuable insights into the geological processes governing epithermal gold–silver deposit formation in the Youxi region. |
| first_indexed | 2024-03-08T10:39:51Z |
| format | Article |
| id | doaj.art-e8f912c48373443bbfe63d12782c2ff2 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-08T10:39:51Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-e8f912c48373443bbfe63d12782c2ff22024-01-26T17:51:39ZengMDPI AGMinerals2075-163X2023-12-011412710.3390/min14010027Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP DataHuanyin He0Jinrong Wang1Wu Wen2Rencong Tian3Jiansui Lin4Weiqiang Huang5Yabin Li6The Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaThe Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaThe Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaThe Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaThe Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaThe Second Geological Exploration Institute of China Metallurgical Geology Bureau, Fuzhou 350108, ChinaCollege of Geoexploration Science and Technology, Jilin University, Changchun 130026, ChinaEpithermal deposits represent a significant category of gold occurrences, with their subsurface structure playing a key role in reserve assessments. Fujian Province, characterized by extensive Mesozoic volcanic activities, stands out as a noteworthy region for shallow hydrothermal mineralization in China. This paper focus on the Youxi area within Fujian Province, employing the dual-frequency induced polarization method (DFIP) and controlled-source audio-frequency magnetotelluric method (CSAMT) to investigate the target ore. The DFIP results revealed predominant northeast-oriented zones with high polarizability and notable apparent resistivity. The CSAMT data were inverted using the SCS2D software. Two-dimensional resistivity profiles reveal a three-layer electrical structure, comprising subsurface banded rhyolites influenced by fault zones, intermediate-low resistivity sandstone layers, and deep-seated high-resistivity conglomerates. The resistivity gradient zones and highly polarizable locations align closely with known local faults. We interpreted these resistivity gradient zones as prospective target areas for mineralization, a hypothesis subsequently validated by drilling results. Combining geochemical analyses of epithermal gold deposits with the electrical resistivity structure, we propose an explanatory model for the mechanism of the formation of epithermal gold–silver deposits in the Youxi area. The magmatic hydrothermal fluids ascended along the fault, underwent convection-driven interaction with meteoric waters, and subsequently metasomatized the host rocks. This integrated approach provides valuable insights into the geological processes governing epithermal gold–silver deposit formation in the Youxi region.https://www.mdpi.com/2075-163X/14/1/27dual-frequency induced polarization methodcontrolled-source audio-frequency magnetotelluric methodepithermal deposits |
| spellingShingle | Huanyin He Jinrong Wang Wu Wen Rencong Tian Jiansui Lin Weiqiang Huang Yabin Li Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data Minerals dual-frequency induced polarization method controlled-source audio-frequency magnetotelluric method epithermal deposits |
| title | Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data |
| title_full | Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data |
| title_fullStr | Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data |
| title_full_unstemmed | Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data |
| title_short | Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data |
| title_sort | deep structure of epithermal deposits in youxi area insights from csamt and dual frequency ip data |
| topic | dual-frequency induced polarization method controlled-source audio-frequency magnetotelluric method epithermal deposits |
| url | https://www.mdpi.com/2075-163X/14/1/27 |
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