Persistent multitiered magma plumbing beneath Katla volcano, Iceland
2016 (English)In: Geochemistry Geophysics Geosystems, ISSN 1525-2027, E-ISSN 1525-2027, Vol. 17, no 3, 966-980 p.Article in journal (Refereed) Published
Recent seismic unrest and a persistent Holocene eruption record at Katla volcano, Iceland indicate that a near-future eruption is possible. Previous petrological investigations suggest that Katla is supplied by a simple plumbing system that delivers magma directly from depth, while seismic and geodetic data also point toward the existence of upper-crustal magma storage. To characterize Katla's recent plumbing system, we established mineral-melt equilibrium crystallization pressures from four age-constrained Katla tephras spanning from 8 kyr BP to 1918. The results point to persistent shallow- (≤8 km depth) as well as deep-crustal (ca. 10 – 25 km depth) magma storage beneath Katla throughout the last 8 kyr. The presence of multiple magma storage regions implies that mafic magma from the deeper reservoir system may become gas-rich during ascent and storage in the shallow crust and erupt explosively. Alternatively, it might intersect evolved magma pockets in the shallow-level storage region, and so increase the potential for explosive mixed-magma ash eruptions.
Place, publisher, year, edition, pages
2016. Vol. 17, no 3, 966-980 p.
Katla volcano; mineral-melt equilibrium thermobarometry; persistent multi-tiered magma plumbing system
IdentifiersURN: urn:nbn:se:uu:diva-285922DOI: 10.1002/2015GC006118ISI: 000375144700019OAI: oai:DiVA.org:uu-285922DiVA: diva2:924133
FunderSwedish Research CouncilThe Royal Swedish Academy of Sciences