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Authors: D'Oriano, C.*
Bertagnini, A.*
Cioni, R.*
Pompilio, M.*
Title: Identifying recycled ash in basaltic eruptions
Title of journal: Scientific Report
Series/Report no.: /4 (2014)
Issue Date: 28-Jul-2014
DOI: 10.1038/srep05851
Keywords: Volcanic Ash
Basaltic eruptions
intra-crater recycling
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.
Appears in Collections:04.08.06. Volcano monitoring
Papers Published / Papers in press

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