Mafic enclaves in the rhyolitic products of Lipari historical eruptions; relationships with the coeval Vulcano magmas (Aeolian Islands, Italy) |
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Authors: | Marcella Davì R De Rosa F Holtz |
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Institution: | 1. Dipartimento di Scienze della Terra via P. Bucci, I-87036, Arcavacata di Rende (CS), Italy 2. Leibniz Universit?t Hannover, Callinstr. 3, D-30167, Hannover, Germany
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Abstract: | The recent finding of mafic enclaves in the Rocche Rosse (RR) lava flow, the last magmatic product on Lipari (Aeolian Islands,
Italy) (AD 1230 ± 40), opens the possibility to investigate in detail the most recent magmatic system of the island, an important
issue for the volcanic hazard assessment of the area. The RR lava flow is an aphyric rhyolitic coulée consisting of grey and
black pumice and black and grey obsidian. Enclaves have ellipsoidal to spheroidal shape and vary from mm-sized in the central
portion of the flow, to cm-sized, at the top and in the flow front, where they are also more abundant. Enclaves are shoshonitic-latitic
(group A) and trachytic (group B) in composition. The mineralogy of group A consists of dominant clinopyroxene crystals with
minor abundance of feldspar (plagioclase > K-feldspar), olivine and biotite, while group B is composed of feldspar (K-feldspar > plagioclase)
with minor clinopyroxene, olivine and biotite. Geochemical modeling suggests that the host rhyolitic rocks could be the product
of AFC (Assimilation plus Fractional Crystallization) of a magma compositionally similar to the associated shoshonitic-latitic
enclaves, which, in turn, could be obtained, through an AFC process, from the primitive melts erupted as olivine hosted melt
inclusions during the last 15 ka at Vulcano. The already-known last 42 ka relationship between Lipari and Vulcano Islands
is here reinforced until historical time, especially for the last 1 ka. The geochemical and petrological overlap between Lipari
and Vulcano is interpreted to reflect the existence of a similar magmatic system underneath the two islands. The nearly aphyric
RR rhyolites are interpreted to be the products of a superheated (temperature far above the liquidus) and initially water-undersaturated
magma that underwent degassing close to the surface inhibiting microlite crystallization. |
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