Water in clinopyroxene from the 2021 Geldingadalir eruption of the Fagradalsfjall Fires, SW-Iceland [Elektronisk resurs]
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Radu, Ioana-Bogdana (författare)
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Skogby, Henrik (författare)
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Troll, Valentin R. (författare)
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Deegan, Frances M. (författare)
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Geiger, Harri (författare)
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Müller, Daniel (författare)
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Thordarson, Thor (författare)
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Centre of Natural Hazard and Disaster Science (CNDS) (medarbetare)
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Centre of Natural Hazard and Disaster Science (CNDS) (medarbetare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- Publicerad: Springer, 2023
- Engelska.
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Ingår i: Bulletin of Volcanology. - 0258-8900. ; 85:5
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Sammanfattning
Ämnesord
Stäng
- Water content plays a significant role in magma genesis, ascent rate, and, ultimately, in the style and intensity of volcanic eruptions, due to its control on the density, viscosity and melting behaviour of silicate melts. A reliable method for determining the pre-eruptive magmatic water content is to use phenocrysts of nominally anhydrous minerals (NAMs) which can preserve water as hydrogen configurations in structural defects. The advantage of this method is that eruptive changes such as water loss during magma degassing may be experimentally reconstructed and analysed by infrared spectroscopy. Applying this to clinopyroxene crystals ( n =17) from lava samples ( n =7) from April 2021 of the Geldingadalir eruption, SW-Iceland, reveals parental water contents of 0.69 ± 0.07 to 0.86 ± 0.09 wt. % H 2 O. These values are higher than those expected for typical mid-ocean ridge basalts (MORB 0.3–0.5 wt. % on average) indicating a significant plume (OIB) contribution to the magma source. Moreover, such water concentrations would imply that water saturation in the ascending Geldingadalir magmas was attained only at very shallow levels within the plumbing system. This could explain the at times pulsating behaviour within the uppermost conduit system as being the result of shallow episodic water vapour exsolution in addition to the deep-sourced CO 2 flux.
Ämnesord
- Natural Sciences (hsv)
- Earth and Related Environmental Sciences (hsv)
- Geology (hsv)
- Naturvetenskap (hsv)
- Geovetenskap och miljövetenskap (hsv)
- Geologi (hsv)
- Natural Sciences (hsv)
- Earth and Related Environmental Sciences (hsv)
- Geosciences, Multidisciplinary (hsv)
- Naturvetenskap (hsv)
- Geovetenskap och miljövetenskap (hsv)
- Multidisciplinär geovetenskap (hsv)
- Natural Sciences (hsv)
- Earth and Related Environmental Sciences (hsv)
- Geophysics (hsv)
- Naturvetenskap (hsv)
- Geovetenskap och miljövetenskap (hsv)
- Geofysik (hsv)
Genre
- government publication (marcgt)
Indexterm och SAB-rubrik
- Water in nominally anhydrous minerals
- Clinopyroxene phenocrystals
- Pulsating eruption
- Shallow magma degassing
- Geldingadalir
Inställningar
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Bulletin of Volcanology