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Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Hartley, Margaret E.
dc.contributor.author Bali, Eniko
dc.contributor.author Maclennan, John
dc.contributor.author Neave, David A.
dc.contributor.author Halldórsson, Sæmundur Ari
dc.date.accessioned 2018-11-09T13:32:25Z
dc.date.available 2018-11-09T13:32:25Z
dc.date.issued 2018-01-12
dc.identifier.citation Hartley, M. E., Bali, E., Maclennan, J., Neave, D. A., & Halldórsson, S. A. (2018). Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland. Contributions to Mineralogy and Petrology, 173(2), 10. doi:10.1007/s00410-017-1435-0
dc.identifier.issn 0010-7999
dc.identifier.issn 1432-0967 (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/892
dc.description Publisher's version (útgefin grein)
dc.description.abstract The 2014–2015 Holuhraun eruption, on the Bárðarbunga volcanic system in central Iceland, was one of the best-monitored basaltic fissure eruptions that has ever occurred, and presents a unique opportunity to link petrological and geochemical data with geophysical observations during a major rifting episode. We present major and trace element analyses of melt inclusions and matrix glasses from a suite of ten samples collected over the course of the Holuhraun eruption. The diversity of trace element ratios such as La/Yb in Holuhraun melt inclusions reveals that the magma evolved via concurrent mixing and crystallization of diverse primary melts in the mid-crust. Using olivine–plagioclase–augite–melt (OPAM) barometry, we calculate that the Holuhraun carrier melt equilibrated at 2.1±0.7 kbar (7.5±2.5 km), which is in agreement with the depths of earthquakes (6±1 km) between Bárðarbunga central volcano and the eruption site in the days preceding eruption onset. Using the same approach, melt inclusions equilibrated at pressures between 0.5 and 8.0 kbar, with the most probable pressure being 3.2 kbar. Diffusion chronometry reveals minimum residence timescales of 1–12 days for melt inclusionbearing macrocrysts in the Holuhraun carrier melt. By combining timescales of diffusive dehydration of melt inclusions with the calculated pressure of H2O saturation for the Holuhraun magma, we calculate indicative magma ascent rates of 0.12–0.29 m s−1. Our petrological and geochemical data are consistent with lateral magma transport from Bárðarbunga volcano to the eruption site in a shallow- to mid-crustal dyke, as has been suggested on the basis of seismic and geodetic datasets. This result is a significant step forward in reconciling petrological and geophysical interpretations of magma transport during volcano-tectonic episodes, and provides a critical framework for the interpretation of premonitory seismic and geodetic data in volcanically active regions.
dc.description.sponsorship This work was supported by Natural Environment Research Council grants [NE/M021130/1] and [IMF548/1114]. DAN acknowledges support from the Alexander von Humboldt Foundation.
dc.language.iso en
dc.publisher Springer Nature
dc.relation.ispartofseries Contributions to Mineralogy and Petrology;173(2)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Iceland
dc.subject Holuhraun
dc.subject Melt inclusions
dc.subject Crystallization
dc.subject Melt barometry
dc.subject Eldgos
dc.subject Hraunrennsli
dc.subject Kristallafræði
dc.title Melt inclusion constraints on petrogenesis of the 2014–2015 Holuhraun eruption, Iceland
dc.type info:eu-repo/semantics/article
dcterms.license This article is an open access publication
dc.description.version Peer Reviewed
dc.identifier.journal Contributions to Mineralogy and Petrology
dc.identifier.doi 10.1007/s00410-017-1435-0
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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