@prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . @prefix prodotto: . unitaDiPersonaleInterno:MATRICOLA3793 pubblicazioni:autoreCNRDi prodotto:ID29181 . @prefix prodottidellaricerca: . @prefix istituto: . istituto:CDS043 prodottidellaricerca:prodotto prodotto:ID29181 . @prefix modulo: . modulo:ID3016 prodottidellaricerca:prodotto prodotto:ID29181 . @prefix rdf: . @prefix retescientifica: . prodotto:ID29181 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID29181 rdfs:label "Complex changes in eruption dynamics during 79 AD eruption of Vesuvius. (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID29181 pubblicazioni:anno "2005-01-01T00:00:00+01:00"^^xsd:gYear . @prefix skos: . prodotto:ID29181 skos:altLabel "
Gurioli L., Houghton B.F., Cashman K.V., Cioni R. (2005)
Complex changes in eruption dynamics during 79 AD eruption of Vesuvius.
in Bulletin of volcanology (Print)
"^^rdf:HTML ; pubblicazioni:autori "Gurioli L., Houghton B.F., Cashman K.V., Cioni R."^^xsd:string ; pubblicazioni:paginaInizio "144"^^xsd:string ; pubblicazioni:paginaFine "159"^^xsd:string ; pubblicazioni:numeroVolume "67"^^xsd:string . @prefix ns11: . prodotto:ID29181 pubblicazioni:rivista ns11:ID472896 ; pubblicazioni:note "n. 2"^^xsd:string ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:titolo "Complex changes in eruption dynamics during 79 AD eruption of Vesuvius."^^xsd:string ; prodottidellaricerca:abstract "The 79 AD eruption of Vesuvius included 8 eruption units (EU1\u00968) and several complex transitions in eruptive style. This study focuses on two important transitions: (1) the abrupt change from white to gray pumice during the Plinian phase of the eruption (EU2 to EU3) and (2) the shift from sustained Plinian activity to the onset of caldera collapse (EU3 to EU4). Quantification of the textural features within individual pumice clasts reveals important changes in both the vesicles and groundmass crystals across each transition boundary. Clasts from the white Plinian fall deposit (EU2) present a simple story of decompression-driven crystallization followed by continuous bubble nucleation, growth and coalescence in the eruptive conduit. In contrast, pumices from the overlying gray Plinian fall deposit (EU3) are heterogeneous and show a wide range in both bubble and crystal textures. Extensive bubble growth, coalescence, and the onset of bubble collapse in pumices at the base of EU3 suggest that the early EU3 magma experienced protracted vesiculation that began during eruption of the EU2 phase and was modified by the physical effects of syn-eruptive mingling-mixing. Pumice clasts from higher in EU3 show higher bubble and crystal number densities and less evidence of bubble collapse, textural features that are interpreted to reflect more thorough mixing of two magmas by this stage of the eruption, with consequent increases in both vesiculation and crystallization. Pumice clasts from a short-lived, high column at the onset of caldera collapse (EU4) continue the trend of increasing crystallization (enhanced by mixing) but, unexpectedly, the melt in these clasts is more vesicular than in EU3 and, in the extreme, can be classified as reticulite. We suggest that the high melt vesicularity of EU4 reflects strong decompression following the partial collapse of the magma chamber." ; prodottidellaricerca:prodottoDi istituto:CDS043 , modulo:ID3016 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA3793 . ns11:ID472896 pubblicazioni:rivistaDi prodotto:ID29181 .