Convective Melting and Water Behavior around Magmatic-Hydrothermal Transition: Numerical Modeling with Application to Krafla Volcano, Iceland
| العنوان: | Convective Melting and Water Behavior around Magmatic-Hydrothermal Transition: Numerical Modeling with Application to Krafla Volcano, Iceland |
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| المؤلفون: | A G Simakin, I N Bindeman |
| المصدر: | Journal of Petrology. 63 |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Geophysics, Geochemistry and Petrology |
| الوصف: | Water is an essential component of rhyolitic magmas and nearly universally, silicic magmatism in the upper crust includes a transition from magma to water-saturated roof rocks. We have numerically simulated the effect of the addition of geothermal fluids to an intruded rhyolitic sill from the hydrothermal system contained within the porous felsitic roof rocks. Water uptake in the melt proceeds via its thermodynamically estimated saturation with a partial melt, corresponding to the fugacity of hydrothermal water in the melt-fluid zone at particular T–P-${X}_{H_2O}$ conditions. It is assumed that the exchange occurs until the melt fraction increases to the threshold melt fraction value εb ≈ 0.3–0.45. In this approximation, the amount of added water is the product of its solubility and the critical melt fraction εb. In two series of numerical experiments run at pressures of 200 and 50 MPa, the interaction of water-filled porous felsite with near liquidus rhyolite magma resulted in water absorption, induced partial melting creating a narrow several meters wide mushy zone, and sluggish convection below that distributed water across the intruded sill. At P = 200 MPa, the addition of about 1.5 wt% water results in stronger volume convection, causing the melting rate to increase to 20 m/year. However, the addition of |
| تدمد: | 1460-2415 0022-3530 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::b28c0df8e68b88f2c674ad0dced4238c https://doi.org/10.1093/petrology/egac074 |
| حقوق: | EMBARGO |
| رقم الأكسشن: | edsair.doi...........b28c0df8e68b88f2c674ad0dced4238c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602415 00223530 |
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