Options
Ash erupted during normal activity at Stromboli (Aeolian Islands, Italy) raises questions on how the feeding system works
Language
English
Obiettivo Specifico
2.3. TTC - Laboratori di chimica e fisica delle rocce
3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
5/73(2011)
Publisher
Springer-Verlag
Pages (printed)
471-477
Issued date
July 2011
Alternative Location
Last version
http://hdl.handle.net/2122/6597
Abstract
Ash fallout collected during 4 days of sampling at Stromboli confirms that a crystal-rich (HP) degassed magma erupts during the Strombolian explosions that are characteristic of the normal activity of this volcano. We identified 3 different types of juvenile ash fragments (fluidal, spongy and dense), which formed through different mechanisms of fragmentation of the low-viscosity, physically heterogeneous (in terms of the size and spatial distribution of bubbles) shoshonitic magma. A small amount (less than 3 vol%) of volatile-rich magma with low porphyricity (LP), erupted as highly vesicular ash fragments, has been collected, together with the HP magma, during normal strombolian explosions. Laboratory experiments and the morphological, textural and compositional investigations of ash fragments reveal that the LP ash is fresh and not recycled from the last paroxysm (15 March 2007). We suggest that small droplets of LP magma are dragged to the surface by the time-variable but persistent supply of deep derived CO2-rich gas bubbles. This coupled ascent of bubbles and LP melts is transient and does not perturb the dynamics of the HP magma within the shallow reservoir. This finding provides a new perspective on how the Stromboli volcano works and has important implications for monitoring strategies.
Type
article
File(s)
No Thumbnail Available
Name
BV_D'Oriano_etal_2011[1].pdf
Size
410.8 KB
Format
Adobe PDF
Checksum (MD5)
c4b447e0c8c6f7abc753106cba546179