Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8384
AuthorsCimarelli, C.* 
De Rita, D.* 
Dolfi, D.* 
Procesi, M.* 
TitleCoeval strombolian and vulcanian-type explosive eruptions at Panarea (Aeolian Islands, Southern Italy)
Issue Date18-Jun-2008
Series/Report no./177 (2008)
DOI10.1016/j.jvolgeores.2008.01.051
URIhttp://hdl.handle.net/2122/8384
Keywordsfall and flow deposits
subaerial–submarine domes
explosive activity
Panarea Aeolian Islands
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs 
AbstractIn this paper, we document the evolution of the emergent Panarea dome in the Aeolian islands (Southern Italy), placing particular emphasis on the reconstruction of the explosive events that occurred during the final stage of its evolution. Two main pyroclastic successions exposing fall deposits with different compositions have been studied into detail: the andesitic Palisi succession and the basaltic Punta Falcone succession. The close-in-time deposition of the two successions, the dispersal area and grain-size distribution of the deposits account for their attribution to vents located in the western sector of the present island and erupting almost contemporaneously. Vents could have been aligned along NNE-trending regional fracture systems controlling the western flank of the dome and possibly its collapse. Laboratory analyses have been devoted to the characterization of the products of the two successions that have been ascribed to vulcanianand to strombolian-type eruptions respectively. The vulcanian eruption started with a vent-clearing phase that occurred by sudden decompression of a pressurized magma producing ballistic bombs and a surge blast and the development of a vulcanian plume. Vulcanian activity was almost contemporaneous to stromboliantype fall-out eruptions. The coeval occurrence of basaltic and andesitic eruptions from close vents and the presence of magmatic basaltic enclaves in the final dacitic lava lobe of the dome allow us to speculate that the intrusion of a basaltic dyke played a major role in triggering explosive eruptions. The final explosive episodes may have been caused by extensional tectonics fracturing the roof of a zoned shallow magma chamber or by the intrusion of a new basaltic magma into a more acidic and shallow reservoir. Intrusion most likely occurred through the injection of dykes along the western cliff of the present Panarea Island inducing the collapse of the western sector of the dome.
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