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Controls on andesitic glaciovolcanism at ice-capped volcanoes from field and experimental studies

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Cole, R.P.
dc.contributor.author White, J.D.L.
dc.contributor.author Büttner, R.
dc.contributor.author Zimanowski, B.
dc.contributor.author Bowman, M.H.
dc.contributor.author Conway, C.E.
dc.contributor.author Leonard, G.S.
dc.contributor.author Pure, L.R.
dc.contributor.author Townsend, D.B.
dc.contributor.author Dürig, Tobias
dc.date.accessioned 2022-01-04T11:02:39Z
dc.date.available 2022-01-04T11:02:39Z
dc.date.issued 2021-05-19
dc.identifier.citation Cole, R.P., et al., 2021, Controls on andesitic glaciovolcanism at ice-capped volcanoes from field and experimental studies: Geology, v. 49, p. 1069–1073, https://doi.org/10.1130/G48735.1
dc.identifier.issn 0091-7613
dc.identifier.issn 1943-2682
dc.identifier.uri https://hdl.handle.net/20.500.11815/2791
dc.description Post-print
dc.description.abstract Glaciovolcanic deposits at Tongariro and Ruapehu volcanoes, New Zealand, represent diverse styles of interaction between wet-based glaciers and andesitic lava. There are iceconfined lavas, and also hydroclastic breccia and subaqueous pyroclastic deposits that formed during effusive and explosive eruptions into meltwater beneath the glacier; they are rare among globally reported products of andesitic glaciovolcanism. The apparent lack of hydrovolcanically fragmented andesite at ice-capped volcanoes has been attributed to a lack of meltwater at the interaction sites because either the thermal characteristics of andesite limit meltwater production or meltwater drains out through leaky glaciers and down steep volcano slopes. We used published field evidence and novel, dynamic andesite-ice experiments to show that, in some cases, meltwater accumulates under glaciers on andesitic volcanoes and that meltwater production rates increase as andesite pushes against an ice wall. We concur with models for eruptions beneath ice sheets showing that the glacial conditions and pre-eruption edifice morphology are more important controls on the style of glaciovolcanism and its products than magma composition and the thermal properties of magmas. Glaciovolcanic products can be useful proxies for paleoenvironment, and the range of andesitic products and the hydrological environments in which andesite erupts are greater than hitherto appreciated.
dc.description.sponsorship R.P. Cole received funding from the Geological Soci-ety of New Zealand Wellman Research Award and the University of Otago Polar Environments Research Theme. The New Zealand Department of Conserva-tion provided logistical assistance in the field. Brent Pooley and Luke Easterbrook assisted with making the experimental apparatus. Matteo Demurtas helped Cole in using MatLab. Kelly Russell, John Smellie, and Alison Graettinger provided constructive reviews.
dc.format.extent 1069-1073
dc.language.iso en
dc.publisher Geological Society of America
dc.relation.ispartofseries Geology;49(9)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Geology
dc.subject Tongariro volcano
dc.subject Lava
dc.subject Eruption
dc.subject Jarðfræði
dc.subject Hraunrennsli
dc.title Controls on andesitic glaciovolcanism at ice-capped volcanoes from field and experimental studies
dc.type info:eu-repo/semantics/article
dcterms.license © 2021 The Authors
dc.description.version Peer Reviewed
dc.identifier.journal Geology
dc.identifier.doi 10.1130/G48735.1
dc.relation.url https://pubs.geoscienceworld.org/gsa/geology/article/49/9/1069/598764/Controls-on-andesitic-glaciovolcanism-at-ice
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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