Ar/Ar and C geochronology of the Albano maar deposits: Implications for defining the age and eruptive style of the most recent explosive activity at Colli Albani Volcanic District,Central Italy |
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| Authors: | B Giaccio F Marra I Hajdas DB Karner PR Renne A Sposato |
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| Institution: | 1. Istituto di Geologia Ambientale e Geoingegneria, CNR, Area della Ricerca RM1-Montelibretti, Via Salaria km 29,300, 00016 Monterotondo Stazione (Roma), Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy;3. Ion Beam Physics, ETH, Schafmattstrasse 20, CH-8093 Zürich, CH, Switzerland;4. Department of Geology, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94985, USA;5. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, U.S.A. and Department of Earth and Planetary Sciences, University of California, Berkeley, CA 94720, USA |
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| Abstract: | New 40Ar/39Ar and 14C ages have been found for the Albano multiple maar pyroclastic units and underlying paleosols to document the most recent explosive activity in the Colli Albani Volcanic District (CAVD) near Rome, Italy, consisting of seven eruptions (Albano 1 = oldest). Both dating methodologies have been applied on several proximal units and on four mid-distal fall/surge deposits, the latter correlated, according to two current different views, to either the Albano or the Campi di Annibale hydromagmatic center. The 40Ar/39Ar ages on leucite phenocrysts from the mid-distal units yielded ages of ca. 72 ka, 73 ka, 41 ka and 36 ka BP, which are indistinguishable from the previously determined 40Ar/39Ar ages of the proximal Albano units 1, 2, 5 and 7, thus confirming their stratigraphic correspondence. |
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| Keywords: | 40Ar/39Ar 14C geochronology Albano maar Central Italy |
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