Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems
Abstract Faults and fractures can be permeable pathways for focused fluid flow in structurally controlled ore‐forming hydrothermal systems. However, quantifying their role in fluid flow on the scale of several kilometers with numerical models typically requires high‐resolution meshes. This study int...
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Wiley
2022-08-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2021GC010302 |
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| author | Marta S. Codeço Philipp Weis Christine Andersen |
| author_facet | Marta S. Codeço Philipp Weis Christine Andersen |
| author_sort | Marta S. Codeço |
| collection | DOAJ |
| description | Abstract Faults and fractures can be permeable pathways for focused fluid flow in structurally controlled ore‐forming hydrothermal systems. However, quantifying their role in fluid flow on the scale of several kilometers with numerical models typically requires high‐resolution meshes. This study introduces a modified numerical representation of m‐scale fault zones using lower‐dimensional elements (here, one‐dimensional [1D] elements in a 2D domain) to resolve structurally controlled fluid flow with coarser mesh resolutions and apply the method to magmatic‐hydrothermal ore‐forming systems. We modeled horizontal and vertical structure‐controlled magmatic‐hydrothermal deposits to understand the role of permeability and structure connectivity on ore deposition. The simulation results of vertically extended porphyry copper systems show that ore deposition can occur along permeable vertical structures where ascending, overpressured magmatic fluids are cooled by downflowing ambient fluids. Structure permeability and fault location control the distribution of ore grades. In highly permeable structures, the mineralization can span up to 3 km vertically, resulting in heat‐pipe mechanisms that promote the ascent of a magmatic vapor phase to an overlying structurally controlled epithermal system. Simulations for the formation of subhorizontal vein‐type deposits suggest that the major control on fluid flow and metal deposition along horizontal structures is the absence of vertical structures above the injection location but their presence at greater distances. Using a dynamic permeability model mimicking crack‐seal mechanisms within the structures leads to a pulsating behavior of fracture‐controlled hydrothermal systems and prevents the inflow of ambient fluids under overpressured conditions. |
| format | Article |
| id | doaj-art-19b80620ad5e47eb8d17dd49173f67ce |
| institution | DOAJ |
| issn | 1525-2027 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
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| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-19b80620ad5e47eb8d17dd49173f67ce2025-08-20T03:05:09ZengWileyGeochemistry, Geophysics, Geosystems1525-20272022-08-01238n/an/a10.1029/2021GC010302Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal SystemsMarta S. Codeço0Philipp Weis1Christine Andersen2GFZ German Research Centre for Geosciences Potsdam GermanyGFZ German Research Centre for Geosciences Potsdam GermanyGFZ German Research Centre for Geosciences Potsdam GermanyAbstract Faults and fractures can be permeable pathways for focused fluid flow in structurally controlled ore‐forming hydrothermal systems. However, quantifying their role in fluid flow on the scale of several kilometers with numerical models typically requires high‐resolution meshes. This study introduces a modified numerical representation of m‐scale fault zones using lower‐dimensional elements (here, one‐dimensional [1D] elements in a 2D domain) to resolve structurally controlled fluid flow with coarser mesh resolutions and apply the method to magmatic‐hydrothermal ore‐forming systems. We modeled horizontal and vertical structure‐controlled magmatic‐hydrothermal deposits to understand the role of permeability and structure connectivity on ore deposition. The simulation results of vertically extended porphyry copper systems show that ore deposition can occur along permeable vertical structures where ascending, overpressured magmatic fluids are cooled by downflowing ambient fluids. Structure permeability and fault location control the distribution of ore grades. In highly permeable structures, the mineralization can span up to 3 km vertically, resulting in heat‐pipe mechanisms that promote the ascent of a magmatic vapor phase to an overlying structurally controlled epithermal system. Simulations for the formation of subhorizontal vein‐type deposits suggest that the major control on fluid flow and metal deposition along horizontal structures is the absence of vertical structures above the injection location but their presence at greater distances. Using a dynamic permeability model mimicking crack‐seal mechanisms within the structures leads to a pulsating behavior of fracture‐controlled hydrothermal systems and prevents the inflow of ambient fluids under overpressured conditions.https://doi.org/10.1029/2021GC010302magmatic‐hydrothermal systemsore depositsfluid flownumerical simulationsfaults and fractures |
| spellingShingle | Marta S. Codeço Philipp Weis Christine Andersen Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems Geochemistry, Geophysics, Geosystems magmatic‐hydrothermal systems ore deposits fluid flow numerical simulations faults and fractures |
| title | Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems |
| title_full | Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems |
| title_fullStr | Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems |
| title_full_unstemmed | Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems |
| title_short | Numerical Modeling of Structurally Controlled Ore Formation in Magmatic‐Hydrothermal Systems |
| title_sort | numerical modeling of structurally controlled ore formation in magmatic hydrothermal systems |
| topic | magmatic‐hydrothermal systems ore deposits fluid flow numerical simulations faults and fractures |
| url | https://doi.org/10.1029/2021GC010302 |
| work_keys_str_mv | AT martascodeco numericalmodelingofstructurallycontrolledoreformationinmagmatichydrothermalsystems AT philippweis numericalmodelingofstructurallycontrolledoreformationinmagmatichydrothermalsystems AT christineandersen numericalmodelingofstructurallycontrolledoreformationinmagmatichydrothermalsystems |