PUMA
Istituto di Geoscienze e Georisorse     
Freda C., Gaeta M., Karner D., Marra F., Renne P., Taddeucci J., Scarlato P., Christensen J., Dallai L. Eruptive history and petrologic evolution of the Albano multiple maar (Alban hills, central Italy). In: Bulletin of Volcanology, vol. 68 (6) pp. 567 - 591. Spriger Verlag, 2006.
 
 
Abstract
(English)
A comprehensive volcanological study of the Albano multiple maar (Alban Hills, Italy) using (i) 40Ar/39Ar geochronology of the most complete stratigraphic section and other proximal and distal outcrops and (ii) petrographic observations, phase analyses of major and trace elements, and Sr and O isotopic analyses of the pyroclastic deposits shows that volcanic activity at Albano was strongly discontinuous, with a first eruptive cycle at 691 ka producing at least two eruptions, and a second cycle with two peaks at 391 and 361 ka producing at least four eruptions. Contrary to previous studies, we did not find evidence of magmatic or hydromagmatic eruptions younger than 361 ka. The activity of Albano was fed by a new batch of primary magma compositionally different from that of the older activity of the Alban Hills; moreover, the REE and 87Sr/86Sr data indicate that the Albano magma originated from an enriched metasomatized mantle. According to the modeled liquid line of descent, this magma differentiated under the influence of magma/limestone wall rock interaction. Our detailed eruptive and petrologic reconstruction of the Albano Maar evolution substantiates the dormant state of the Alban Hills Volcanic District.
URL: http://www.springerlink.com/openurl.asp?genre=journal&issn=0258-8900
Subject eruptive cycles
geochronology
Alban Hills
Maar
hydromagnetic
ultrapotassic
stratigraphy
decarbonation
Italy


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