| Reference Type | Journal (article/letter/editorial) |
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| Title | Late-alpine five-element mineralization in the Punta Corna vein system (Western Alps): evolution of methane-bearing crustal fluids and their role to arsenide precipitation and ore-deposit metallogeny |
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| Journal | Ore Geology Reviews |
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| Authors | Domenighini, Giulia | Author |
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| Walter, Benjamin F. | Author |
| Markl, Gregor | Author |
| Ferrando, Simona | Author |
| Steele-MacInnis, Matthew | Author |
| Santoro, Licia | Author |
| Year | 2026 | Volume | < 188 > |
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| Page(s) | 107034 |
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| URL | |
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| DOI | doi:https://doi.org/10.1016/j.oregeorev.2025.107034Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 19295551 | Long-form Identifier | mindat:1:5:19295551:9 |
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| GUID | 0 |
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| Full Reference | Domenighini, Giulia; Walter, Benjamin F.; Markl, Gregor; Ferrando, Simona; Steele-MacInnis, Matthew; Santoro, Licia (2026) Late-alpine five-element mineralization in the Punta Corna vein system (Western Alps): evolution of methane-bearing crustal fluids and their role to arsenide precipitation and ore-deposit metallogeny. Ore Geology Reviews, 188. 107034 doi:10.1016/j.oregeorev.2025.107034 |
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| Plain Text | Domenighini, Giulia; Walter, Benjamin F.; Markl, Gregor; Ferrando, Simona; Steele-MacInnis, Matthew; Santoro, Licia (2026) Late-alpine five-element mineralization in the Punta Corna vein system (Western Alps): evolution of methane-bearing crustal fluids and their role to arsenide precipitation and ore-deposit metallogeny. Ore Geology Reviews, 188. 107034 doi:10.1016/j.oregeorev.2025.107034 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | The Punta Corna vein system (PC), located within the Western Alpine meta-ophiolites, is characterized by a five-element vein type mineralization including Fe-Co-Ni arsenides preceded and followed by a typical base-metal sulfide mineralization, comprising tetrahedrite, chalcopyrite, pyrite and galena. Three distinct hydrothermal stages were recognized: Sulfide stage I, Arsenide stage and Sulfide stage II. Microthermometric analysis of fluid inclusion assemblages from Sulfide stage I allowed to constrain fluid A (surface-derived, sulfate-bearing, ∼27.3 wt% total salinity and 140 °C homogenization temperature) and fluid B (deep-seated, methane-bearing, 18.8 wt% total average salinity and 163 °C homogenization temperature). The Arsenide stage is characterized by the presence of fluid C (deep-seated, ∼19 wt% total average salinity and 156 °C homogenization temperature) and fluid D (deep-seated, ∼13 wt% total average salinity and 230 °C homogenization temperature). Fluids B and C are inferred to represent the same fluid, with and without methane, respectively. The absence of methane in fluid C is interpreted as its consumption during arsenide formation by reduction. This detailed fluid inclusion study revealed evidence of pre-ore methane, which has been proposed as a reducing agent, important in the formation of five-element mineralization. This finding has two important implications: (i) it constrains the shift from a hydrothermal system precipitating base metal sulfides to a five-element one through the mixing of a metal-bearing fluid and a highly reduced methane-bearing fluid, and (ii) it records the presence of an oxidized sulfate-bearing brine and the reduced-metal bearing fluid in the crustal rocks, which mixed and thus formed the five-element mineralization. Crucial to this process is the role of late-Alpine brittle tectonics, which, through the development of two main fault systems, enhanced rock permeability allowing the input of different fluids in the active hydrothermal system. |
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