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Bulk rock composition and geochemistry of olivine-hosted melt inclusions in the Grey Porri Tuff and selected lavas of the Monte dei Porri volcano, Salina, Aeolian Islands, southern Italy

Angela Doherty
  • Dipartimento di Scienze degli Alimenti e dell’Ambiente “Prof. G. Stagno d’Alcontres” — Sezione Scienze della Terra, Università degli Studi di Messina, Messina, 98122, Italy
  • Fluids Research Laboratory, Department of Geosciences, Virginia Tech, Blacksburg, VA, 24060, USA
  • Dipartimento di Scienza della Terra, Università degli Studi di Napoli Federico II, Napoli, 80134, Italy
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/ Robert Bodnar / Benedetto Vivo / Wendy Bohrson / Harvey Belkin / Antonia Messina
  • Dipartimento di Scienze degli Alimenti e dell’Ambiente “Prof. G. Stagno d’Alcontres” — Sezione Scienze della Terra, Università degli Studi di Messina, Messina, 98122, Italy
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Published Online: 2012-05-13 | DOI: https://doi.org/10.2478/s13533-011-0066-7


The Aeolian Islands are an arcuate chain of submarine seamounts and volcanic islands, lying just north of Sicily in southern Italy. The second largest of the islands, Salina, exhibits a wide range of compositional variation in its erupted products, from basaltic lavas to rhyolitic pumice. The Monte dei Porri eruptions occurred between 60 ka and 30 ka, following a period of approximately 60,000 years of repose. The bulk rock composition of the Monte dei Porri products range from basaltic-andesite scoria to andesitic pumice in the Grey Porri Tuff (GPT), with the Monte dei Porri lavas having basaltic-andesite compositions. The typical mineral assemblage of the GPT is calcic plagioclase, clinopyroxene (augite), olivine (Fo72−84) and orthopyroxene (enstatite) ± amphibole and Ti-Fe oxides. The lava units show a similar mineral assemblage, but contain lower Fo olivines (Fo57−78). The lava units also contain numerous glomerocrysts, including an unusual variety that contains quartz, K-feldspar and mica. Melt inclusions (MI) are ubiquitous in all mineral phases from all units of the Monte dei Porri eruptions; however, only data from olivine-hosted MI in the GPT are reported here. Compositions of MI in the GPT are typically basaltic (average SiO2 of 49.8 wt %) in the pumices and basaltic-andesite (average SiO2 of 55.6 wt %) in the scoriae and show a bimodal distribution in most compositional discrimination plots. The compositions of most of the MI in the scoriae overlap with bulk rock compositions of the lavas. Petrological and geochemical evidence suggest that mixing of one or more magmas and/or crustal assimilation played a role in the evolution of the Monte dei Porri magmatic system, especially the GPT. Analyses of the more evolved mineral phases are required to better constrain the evolution of the magma.

Keywords: Salina; Aeolian Islands; melt inclusions; magmatic evolution

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Published Online: 2012-05-13

Published in Print: 2012-06-01

Citation Information: Open Geosciences, Volume 4, Issue 2, Pages 338–355, ISSN (Online) 2391-5447, DOI: https://doi.org/10.2478/s13533-011-0066-7.

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