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Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesis

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dc.contributor.author Ranta, Eemu Johannes
dc.contributor.author Halldórsson, Sæmundur Ari
dc.contributor.author Barnes, J. D.
dc.contributor.author Jónasson, Kristján
dc.contributor.author Stefánsson, Andri
dc.date.accessioned 2021-11-20T01:01:14Z
dc.date.available 2021-11-20T01:01:14Z
dc.date.issued 2021-01-13
dc.identifier.citation Ranta , E J , Halldórsson , S A , Barnes , J D , Jónasson , K & Stefánsson , A 2021 , ' Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesis ' , Geochemical Perspectives Letters , vol. 16 , pp. 35-39 . https://doi.org/10.7185/GEOCHEMLET.2101
dc.identifier.issn 2410-339X
dc.identifier.other PURE: 39394971
dc.identifier.other PURE UUID: 280f8d07-4f30-43d4-b653-ab27ef911ac4
dc.identifier.other Scopus: 85100297932
dc.identifier.other WOSLite: 000612386800001
dc.identifier.uri https://hdl.handle.net/20.500.11815/2719
dc.description Publisher Copyright: © 2021 The Authors.
dc.description.abstract Magmatic volatile phases within crustal silicic magma domains influence key volcanic processes such as the build up to eruptions and formation of magmatic-hydrothermal ore deposits. However, the extent and nature of fluid-melt interaction in such environments is poorly understood, as geochemical signals in volcanic rocks originating from pre-eruptive volatile processes are commonly overprinted by syn-eruptive degassing. Here, we use δ37Cl as a conservative tracer of brine-melt interaction on a broad suite of silicic volcanic rocks from Iceland. We find that the δ37Cl values of silicic rocks are systematically shifted to more negative values compared to associated basalts and intermediate rocks by up to 2.9 . These large shifts cannot be explained by well known processes inherent to silicic magma genesis, including crustal assimilation, mineral-melt fractionation and syn-eruptive degassing. Instead, we show that low δ37Cl values in silicic rocks can be attributed to assimilation of magmatic brines that are formed and stored in long lived crustal magma mushes. Our results indicate that magmatic brine assimilation is a fundamental, but previously unrecognised part of rhyolite genesis.
dc.format.extent 5
dc.format.extent 35-39
dc.language.iso en
dc.relation.ispartofseries Geochemical Perspectives Letters; 16()
dc.rights info:eu-repo/semantics/openAccess
dc.subject Hraun
dc.subject Gosberg
dc.subject Klór
dc.subject Klórsamsætur
dc.subject Klórsamsætur
dc.subject Chlorine isotopes
dc.subject Hydrosaline fluids
dc.subject Magmatic brine
dc.subject Magmatic volatiles
dc.subject Silicic magma
dc.subject Magma mush
dc.subject Environmental Chemistry
dc.subject Geology
dc.subject Geochemistry and Petrology
dc.title Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesis
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.7185/GEOCHEMLET.2101
dc.relation.url http://www.scopus.com/inward/record.url?scp=85100297932&partnerID=8YFLogxK
dc.contributor.department Faculty of Earth Sciences
dc.contributor.department Science Institute
dc.contributor.department Faculty of Industrial Engineering, Mechanical Engineering and Computer Science


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