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Identifying recycled ash in basaltic eruptions
Author(s)
Language
English
Obiettivo Specifico
3V. Dinamiche e scenari eruttivi
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/4 (2014)
Pages (printed)
5851
Issued date
July 28, 2014
Alternative Location
Abstract
Deposits of mid-intensity basaltic explosive eruptions are characterized by the coexistence of different types of juvenile clasts, which show a large variability of external properties and texture, reflecting alternatively the effects of primary processes related to magma storage or ascent, or of syn-eruptive modifications occurred during or immediately after their ejection. If fragments fall back within the crater area before being re-ejected during the ensuing activity, they are subject to thermally- and chemically-induced alterations. These ‘recycled’ clasts can be considered as cognate lithic for the eruption/explosion they derive. Their exact identification has consequences for a correct interpretation of eruption dynamics, with important implications for hazard assessment. On ash erupted during selected basaltic eruptions (at Stromboli, Etna, Vesuvius, Gaua-Vanuatu), we have identified a set of characteristics that can be associated with the occurrence of intra-crater recycling processes, based also on the comparison with results of reheating experiments performed on primary juvenile material, at variable temperature and under different redox conditions.
References
D’Oriano, C., Bertagnini, A., Cioni, R. & Pompilio, M. Identifying
recycled ash in basaltic eruptions. Sci. Rep. 4, 5851; DOI:10.1038/srep05851 (2014).
recycled ash in basaltic eruptions. Sci. Rep. 4, 5851; DOI:10.1038/srep05851 (2014).
Type
article
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D'Oriano_et_al_SciRep_2014.pdf
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6.92 MB
Format
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Checksum (MD5)
5154a0dde0f24f164aef03a896cbb10a