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Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. / Owen, Jacqueline; Tuffen, Hugh; McGarvie, Dave.
In: Journal of Volcanology and Geothermal Research, Vol. 258, 15.05.2013, p. 143-162.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Owen, J, Tuffen, H & McGarvie, D 2013, 'Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland', Journal of Volcanology and Geothermal Research, vol. 258, pp. 143-162. https://doi.org/10.1016/j.jvolgeores.2013.03.021

APA

Owen, J., Tuffen, H., & McGarvie, D. (2013). Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. Journal of Volcanology and Geothermal Research, 258, 143-162. https://doi.org/10.1016/j.jvolgeores.2013.03.021

Vancouver

Owen J, Tuffen H, McGarvie D. Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. Journal of Volcanology and Geothermal Research. 2013 May 15;258:143-162. doi: 10.1016/j.jvolgeores.2013.03.021

Author

Owen, Jacqueline ; Tuffen, Hugh ; McGarvie, Dave. / Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland. In: Journal of Volcanology and Geothermal Research. 2013 ; Vol. 258. pp. 143-162.

Bibtex

@article{f444f4a39e004ecdad98215c0dff88ea,
title = "Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakv{\'i}sl, South Iceland",
abstract = "Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This paper addresses a subglacial rhyolitic eruption at Dalakv{\'i}sl in South Iceland that involved both explosive and effusive activities. We present measurements of pre- and post-eruptive magmatic volatile contents that we use to track magma degassing from the chamber to the surface and reconstruct pressure conditions during the eruption. Explosive and effusive phases involve significant differences in: (1) pre-eruptive volatile contents; (2) the {\textquoteleft}openness{\textquoteright} of magma degassing; and (3) inferred confining pressure. This final factor is potentially associated with a j{\"o}kulhlaup-induced decompression. Due to the combination of these factors Dalakv{\'i}sl experienced a change from effusive to explosive behaviour, although we cannot currently resolve cause from effect. Our work points towards complex interactions between the dynamics of magma ascent and the response of overlying ice and meltwater during rhyolitic eruptions beneath ice.",
keywords = "Volatiles, degassing, Subglacial, rhyolite, melt inclusions, Volcano–ice interactions, Solubility–pressure relationships",
author = "Jacqueline Owen and Hugh Tuffen and Dave McGarvie",
year = "2013",
month = may,
day = "15",
doi = "10.1016/j.jvolgeores.2013.03.021",
language = "English",
volume = "258",
pages = "143--162",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier Science B.V.",

}

RIS

TY - JOUR

T1 - Pre-eruptive volatile content, degassing paths and depressurisation explaining the transition in style at the subglacial rhyolitic eruption of Dalakvísl, South Iceland

AU - Owen, Jacqueline

AU - Tuffen, Hugh

AU - McGarvie, Dave

PY - 2013/5/15

Y1 - 2013/5/15

N2 - Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This paper addresses a subglacial rhyolitic eruption at Dalakvísl in South Iceland that involved both explosive and effusive activities. We present measurements of pre- and post-eruptive magmatic volatile contents that we use to track magma degassing from the chamber to the surface and reconstruct pressure conditions during the eruption. Explosive and effusive phases involve significant differences in: (1) pre-eruptive volatile contents; (2) the ‘openness’ of magma degassing; and (3) inferred confining pressure. This final factor is potentially associated with a jökulhlaup-induced decompression. Due to the combination of these factors Dalakvísl experienced a change from effusive to explosive behaviour, although we cannot currently resolve cause from effect. Our work points towards complex interactions between the dynamics of magma ascent and the response of overlying ice and meltwater during rhyolitic eruptions beneath ice.

AB - Many volcanoes express a variety of contrasting eruptive styles with behavioural transitions between explosive and effusive activities. Understanding eruptive mechanisms is of key importance but we currently have little insight into the behavioural controls for rhyolitic eruptions beneath ice. This paper addresses a subglacial rhyolitic eruption at Dalakvísl in South Iceland that involved both explosive and effusive activities. We present measurements of pre- and post-eruptive magmatic volatile contents that we use to track magma degassing from the chamber to the surface and reconstruct pressure conditions during the eruption. Explosive and effusive phases involve significant differences in: (1) pre-eruptive volatile contents; (2) the ‘openness’ of magma degassing; and (3) inferred confining pressure. This final factor is potentially associated with a jökulhlaup-induced decompression. Due to the combination of these factors Dalakvísl experienced a change from effusive to explosive behaviour, although we cannot currently resolve cause from effect. Our work points towards complex interactions between the dynamics of magma ascent and the response of overlying ice and meltwater during rhyolitic eruptions beneath ice.

KW - Volatiles

KW - degassing

KW - Subglacial

KW - rhyolite

KW - melt inclusions

KW - Volcano–ice interactions

KW - Solubility–pressure relationships

U2 - 10.1016/j.jvolgeores.2013.03.021

DO - 10.1016/j.jvolgeores.2013.03.021

M3 - Journal article

VL - 258

SP - 143

EP - 162

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

ER -