NDLI: A complex, Subplinian-type eruption from low-viscosity, phonolitic to tephri-phonolitic magma: the AD 472 (Pollena) eruption of Somma-Vesuvius, Italy

Content Provider	Springer Nature Link
Author	Sulpizio, Roberto Mele, Daniela Delli, Pierfrancesco Volpe, Luigi La
Copyright Year	2005
Abstract	The combined use of field investigation and laboratory analyses allowed the detailed stratigraphic reconstruction of the Pollena eruption (472 AD) of Somma-Vesuvius. Three main eruptive phases were recognized, related either to changes in the eruptive processes and/or to relative changes of melt composition. The eruption shows a pulsating behavior with deposition of pyroclastic fall beds and generation of dilute and dense pyroclastic density currents (PDC). The eruptive mechanisms and transportation dynamics were reconstructed for the whole eruption. Column heights were between 12 and 20 km, corresponding to mass discharge rates (MDR) of 7×106 kg/s and 3.4×107 kg/s. Eruptive dynamics were driven by magmatic fragmentation of a phono-tephritic to tephri-phonolitic magma during Phases I and II, whereas phreatomagmatic fragmentation dominated Phase III. Magma composition varies between phonolitic and tephritic-phonolitic, with melt viscosity likely not in excess of 103 Pa s. The volume of the pyroclastic fall deposits, calculated by using of proximal isopachs, is 0.44 km3. This increases to 1.38 km3 if ash volumes are extrapolated on a log thickness vs. square root area diagram using one distal isopach and column height.
Starting Page	743
Ending Page	767
Page Count	25
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	67
Issue Number	8
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-04-13
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Subplinian eruption Oscillating behavior Magmatic-phreatomagmatic fragmentation Pyroclastic density currents
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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