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http://hdl.handle.net/2122/2389
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) | Journal: | Bull. Volcanol | Series/Report no.: | /68 (2006) | Issue Date: | 2006 | DOI: | 10.1001/S00445-005-0033-6 | Keywords: | Eruptive cycles Geochronology Alban Hills Maar Ultrapotassic Hydromagmatic Decarbonation |
Subject Classification: | 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions |
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: | Article published / in press |
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