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Simulations use realistic magma properties for varying compositions and water contents, showing convection-driven homogenization that delays release and promotes transition to mush. Near-explosive tube-flow outbursts can precede ore formation, followed by sustained moderate flushing and later radial-cooling release over 50–100 kyr.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & 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degassing?",{"text":72,"@type":64},"Convection at melt-dominated stages homogenizes the system, delaying fluid release and driving a rapid evolution toward a mush state, which can later produce distinct outgassing phases.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},135655,1787316729,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & 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degassing and hydrothermal fluid flow reveal distinct stages of volatile release  \n• After a magma incubation phase with bubble suspension, hydrous magmascan experience a near‐explosive tube‐ flow outburst from magma mush  \n• After crystal lock‐up, shifting from uniform to radial cooling leads to continuous outgassing, potentially forming porphyry Cu deposits  \nCorrespondence to:  \nY. Gruzdeva,  \nyulia.gruzdeva@gfz-potsdam.de  \nCitation:  \nGruzdeva, Y., Weis, P., & Andersen, C.(2024) . Timing of volatile degassing from hydrous upper‐crustal magma reservoirs with implications for porphyry copper deposits. Journal of Geophysical Research: Solid Earth, 129, e2023JB028433. [https://doi.org/10.1029/](https://doi.org/10.1029/)[ ](https://doi.org/10.1029/)2023JB028433  \nReceived 4 DEC 2023 Accepted 25 JUN 2024  \nAuthor Contributions:  \nConceptualization: Philipp Weis  \nData curation: Philipp Weis  \nFormal analysis: Yulia Gruzdeva, Philipp Weis  \nFunding acquisition: Philipp Weis  \nMethodology: Philipp Weis  \nSoftware: Yulia Gruzdeva, Philipp Weis, Christine Andersen  \nSupervision: Philipp Weis  \nVisualization: Yulia Gruzdeva, Philipp Weis  \nWriting – original draft: Yulia Gruzdeva Writing – review & editing:  \nPhilipp Weis, Christine Andersen  \n© 2024. The Author(s) .  \nThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.  \nTiming of Volatile Degassing From Hydrous Upper‐Crustal Magma Reservoirs With Implications for Porphyry Copper Deposits  \nYulia Gruzdeva1,2 , Philipp Weis1,2 , and Christine Andersen1   \n1GFZ German Research Centre for Geosciences, Potsdam, Germany, 2Institute of Geosciences, University of Potsdam, Potsdam, Germany  \nAbstract The timing and duration of volatile generation from crystallizing magma reservoirs and fluid release across the magmatic‐hydrothermal interface depend on complex coupled interactions controlled by non‐ linear, dynamic properties of magmas, rocks and fluids. Understanding these mechanisms is essential to explain the rare formation of economic porphyry copper deposits. For this study, we further developed a coupled numerical model that can simultaneously resolve magma and hydrothermal flow by introducing a description of fluid transport within the magma reservoir and volatile release to the host rock. Our simulations use realistic magma properties derived from published experimental and modeling studies and cover different magma compositions and water contents. We show that magma convection at melt‐dominated states leads to homogenization, which delays fluid release and promotes a rapid evolution toward a mush state. The onset of magmatic volatile release can be near‐explosive with a tube‐flow outburst event lasting \u003C100 years for high initial water contents of >3.5 wt% H2O that could result in the formation of hydrothermal breccias and vein stockworks or trigger eruptions. This event can be followed by sustained fluid release at moderate rates by volatile flushing caused by magma convection. Subsequent fluid release from concentric tube rings by radial cooling of non‐convecting magma mush with a volume of ∼100 km3 at ∼5 km depth is limited to remaining water contents of ∼3.1 wt% H2O and lasts 50–100 kyr. Ore formation from hydrous magmas may thus involve distinct phases of volatile release.  \nPlain Language Summary High‐temperature fluids are expelled from water‐bearing magma bodies as they cool in the subsurface. These fluids can lead to the formation of ore deposits and geothermal resources and even trigger volcanic eruptions. In this study, we investigate how fluids are transported within a coupled magmatic‐hydrothermal system and how the magma composition, including the initial amount of water, and magma convection can affect the","cbCaiuji4HFca2XU","https://ap.wps.com/l/cbCaiuji4HFca2XU","pdf",2297315,"English","# Key points\n# Abstract\n# Plain Language Summary\n# 1. Introduction\n## Porphyry copper deposits and hydrous magmas\n## Role of volatile discharge without eruption","[{\"question\":\"What does the study aim to explain about volatile release?\",\"answer\":\"It explains the timing and duration of volatile generation and fluid release from crystallizing magma reservoirs and across the magmatic–hydrothermal interface.\"},{\"question\":\"What modeling approach is used in the research?\",\"answer\":\"A coupled numerical model simultaneously resolves magma and hydrothermal flow by describing fluid transport within the magma reservoir and volatile release to the host rock.\"},{\"question\":\"How does magma convection influence volatile degassing?\",\"answer\":\"Convection at melt-dominated stages homogenizes the system, delaying fluid release and driving a rapid evolution toward a mush state, which can later produce distinct outgassing phases.\"}]","Timing of Volatile Degassing From Hydrous Upper-Crustal Magma Reservoirs - With Implications for Porphyry Copper Deposits | PDF",48]