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Book Chapter

Volcanism, calderas and magmas of the Alicudi composite volcano (western Aeolian archipelago)

By
F. Lucchi
F. Lucchi
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Piazza Porta S.Donato 1, 40126 Bologna, Italy
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A. Peccerillo
A. Peccerillo
Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università 1, 06100 Perugia, Italy
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C. A. Tranne
C. A. Tranne
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Piazza Porta S.Donato 1, 40126 Bologna, Italy
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P. L. Rossi
P. L. Rossi
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Piazza Porta S.Donato 1, 40126 Bologna, Italy
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M. L. Frezzotti
M. L. Frezzotti
Dipartimento di Scienze dell'Ambiente e del Territorio e di Scienze della Terra, Università di Milano - Bicocca, Piazza Della Scienza 4, 20126 Milano, Italy
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C. Donati
C. Donati
Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università 1, 06100 Perugia, Italy
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Published:
January 01, 2013

Abstract

The Alicudi composite volcano (western Aeolian archipelago) was constructed between c. 106 and 28 ka by lava flows, domes and strombolian scoriae erupted during six Eruptive Epochs, interrupted by periods of dormancy and three caldera-type collapses in the summit area. Marine Isotope Stage (MIS) 5a (81 ka) terrace deposits and widespread Brown Tuffs of external origin are recognized and provide important marker beds for regional stratigraphic correlations. Volcanism was of central type, under control of the summit caldera collapses with negligible influence of regional tectonic trends. Alicudi rocks are basaltic to high-K andesitic and have the most primitive petrological compositions (high MgO, Ni, Cr contents), the lowest Sr–O and the highest Nd–He isotope ratios (87Sr/86Sr=0.70352 to 0.70410; 143Nd/144Nd=0.51289 to 0.51279; δ18O=+5.0 to 5.6; 3He/4He–R/Ra=c. 6.5 to 7.1) over the entire Aeolian archipelago. Their composition and variation through time are the result of polybaric crystal–liquid fractionation of parental calc-alkaline basalts to give basaltic andesitic and andesitic derivative melts. These underwent crustal assimilation during ascent, with basalts being contaminated more strongly than andesitic magmas. Sr–Nd–Pb isotopes suggest source metasomatic modification by fluids from an oceanic-type slab, with a minor role for subducted sediments.

DVD:

The 10 000 scale geological map of Alicudi is included on the DVD in the printed book and can also be accessed online at http://www.geolsoc.org.uk/Memoir37-electronic. Also included is a geochemical dataset for Alicudi.

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Contents

Geological Society, London, Memoirs

The Aeolian Islands Volcanoes

F. Lucchi
F. Lucchi
University of Bologna, Italy
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A. Peccerillo
A. Peccerillo
University of Perugia, Italy
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J. Keller
J. Keller
University Freiburg, Germany
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C. A. Tranne
C. A. Tranne
University of Bologna, Italy
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P. L. Rossi
P. L. Rossi
University of Bologna, Italy
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Geological Society of London
Volume
37
ISBN electronic:
9781862396371
Publication date:
January 01, 2013

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