| Reference Type | Journal (article/letter/editorial) |
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| Title | Magmatic and hydrothermal evolution of the superlarge Dashui goldfield in the West Qinling Orogen, China |
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| Journal | Ore Geology Reviews |
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| Authors | Yang, Haochen | Author |
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| Yang, Fan | Author |
| Jepson, Gilby | Author |
| Bagas, Leon | Author |
| Tu, Jiarun | Author |
| Li, Hongying | Author |
| Qian, Zesheng | Author |
| Year | 2024 | Volume | < 169 > |
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| URL | |
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| DOI | doi:10.1016/j.oregeorev.2024.106095Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17416196 | Long-form Identifier | mindat:1:5:17416196:9 |
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| GUID | 0 |
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| Full Reference | Yang, Haochen, Yang, Fan, Jepson, Gilby, Bagas, Leon, Tu, Jiarun, Li, Hongying, Qian, Zesheng (2024) Magmatic and hydrothermal evolution of the superlarge Dashui goldfield in the West Qinling Orogen, China. Ore Geology Reviews, 169. 106095 doi:10.1016/j.oregeorev.2024.106095 |
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| Plain Text | Yang, Haochen, Yang, Fan, Jepson, Gilby, Bagas, Leon, Tu, Jiarun, Li, Hongying, Qian, Zesheng (2024) Magmatic and hydrothermal evolution of the superlarge Dashui goldfield in the West Qinling Orogen, China. Ore Geology Reviews, 169. 106095 doi:10.1016/j.oregeorev.2024.106095 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Gold (Au) is a precious metal that has played an important role in the development of the global economy. It is therefore important to better define the genesis of Au mineralisation as an aid to focus exploration as the consumption of Au increases. The Dashui goldfield contains a super large Au resource of over 120 t (tonnes) in the West Qinling Orogen, central China. Despite several studies have focused on the genesis of the Dashui goldfield, the original physico–chemical natures of magmatic and hydrothermal evolution remain unclear. Biotite and apatite in the mineralised diorite porphyry of the goldfield are sensitive to the changes in the physico–chemical conditions and the evolution of magmatic and hydrothermal fluids, and thus provide important keys to address these issues. Hence, we conducted detailed in–situ major and trace element studies of biotite and apatite from the ore–bearing diorite porphyry in the Dashui goldfield. Our aim is to elucidate the physico–chemical conditions, magma source, and magmatic and hydrothermal evolution processes during the deposition of the gold, and to enhance the understanding of the Au genesis in the West Qinling Au province. Using the geochemistry of magmatic apatite, and magmatic and hydrothermal biotite, we have found that the crystallisation temperature and pressure along with emplacement depth of diorite porphyry were constrained at ∼ 737–791 °C, 1.08–1.73 kbar, and 3.94–6.30 km. The diorite porphyry has the geochemical affinities with calcium alkaline orogenic suites derived from a mixed crustal and mantle source. During the early emplacement of diorite porphyry, the melt had a high oxygen fugacity and was highly enriched in Au. During the late magma crystallisation of diorite porphyry, the magma was enriched continuously in most elements with the Ba/Rb ratios in the biotite varying from 10 to 5, and most of the Au was hosted by pyrite. Additionally, elements were continuously dissolved into fluids generating Cl–rich hydrothermal fluids during the evolution of the magma. During hydrothermal evolution, Au is migrated with As and Sb in the vapour phases of fluids, whereas Au migrated with Cl in the liquid phase. When temperatures dropped to ∼ 200–400 °C, Au started to combine with S and Si in the liquid phase of fluids. Subsequently, hydrothermal fluids interacted with host carbonate to form the Dashui goldfield, Au during this stage was also transported and hosted in magnetite, hematite, and quartz within the carbonate rocks. |
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