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http://hdl.handle.net/2122/9064
Authors: | D'Oriano, C.* Bertagnini, A.* Cioni, R.* Pompilio, M.* |
Title: | Identifying recycled ash in basaltic eruptions | Journal: | Scientific Report | Series/Report no.: | /4 (2014) | Issue Date: | 28-Jul-2014 | DOI: | 10.1038/srep05851 | URL: | http://www.nature.com/srep/2014/140728/srep05851/full/srep05851.html | Keywords: | Volcanic Ash Basaltic eruptions intra-crater recycling |
Subject Classification: | 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring | 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. |
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