Details of the Abstract
| Title of paper | Joint Interpretation of Magnetotelluric and Deep Seismic Reflection Data Reveals Deep Fossil Source Region and Fluid Pathways of Gold Deposits in the West Qinling Orogenic Belt, Northeastern Tibetan Plateau |
| List of authors | Huilin Li, Letian Zhang, Hongda Liang, Xiaoyu Guo, Rui Gao |
| Affiliation(s) | Sun Yat-Sen University, China University of Geosciences (Beijing), Chinese Academy of Geological Science, Sun Yat-Sen University, Sun Yat-Sen University |
| Summary |
The West Qinling Orogenic Belt, located in the northeastern margin of the Tibetan Plateau, has undergone a series of subduction–collision orogenic events and hosts abundant polymetallic mineralization deposits, particularly in the Tongren–Xiahe–Hezuo area, which is an important gold mineralization belt in China. However, the origin of Au-bearing materials and the processes of fluid transport from the deep crust remain unclear. In this study, magnetotelluric (MT) imaging reveals a large high-conductivity zone (<20 Ω·m) at depths of 18–50 km beneath the Tongren–Xiahe–Hezuo area. This zone represents the deep source region of Au-bearing fluids that may be associated with devolatilization processes during Triassic slab subduction. Additionally, sub-vertical conductors in the upper crust that connect with the inferred source region may represent pathways for Au-bearing fluids. Interpretation of the MT and seismic reflection profiles suggests that the subduction system provided the conditions necessary for the development of the source region and auriferous pathways, ultimately contributing to the formation of gold deposits in the Tongren–Xiahe–Hezuo area. * This work was supported by the National Natural Science Foundation of China (No. 42304105, 42074089, 42374125, 42325402, 42274120, 41974097), the Guangdong Pearl River Talent Program (No. 211ZT07Z066), and the Southern Marine Laboratory (Zhuhai) Program (No. 311021003). |
| Session Keyword | 3.0 EM methods for exploration (geothermal, mineral resources, etc.) |
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