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Authors: Freda, C.*
Gaeta, M.*
Karner, D. B.*
Marra, F.*
Renne, P. R.*
Taddeucci, J.*
Scarlato, P.*
Christensen, J. N.*
Dallai, L.*
Title: Eruptive history and petrologic evolution of the Albano multiple maar (Alban Hills, Central Italy)
Title of journal: Bull. Volcanol
Series/Report no.: /68 (2006)
Issue Date: 2006
DOI: 10.1001/S00445-005-0033-6
Keywords: Eruptive cycles
Alban Hills
Abstract: 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 69±1 ka producing at least two eruptions, and a second cycle with two peaks at 39±1 and 36±1 ka producing at least four eruptions. Contrary to previous studies, we did not find evidence of magmatic or hydromagmatic eruptions younger than 36±1 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.
Appears in Collections:05.02.03. Volcanic eruptions
04.08.03. Magmas
04.08.05. Volcanic rocks
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