The deep structure of the Eolian arc (Filicudi-Panarea-Vulcano sector) in light of gravity, magnetic and volcanological data

Barberi, F.; Gandino, A.; Gioncada, Anna; Torre, P. L. A.; Sbrana, Alessandro; Zenucchini, C.

doi:10.1016/0377-0273(94)90003-5

Cited by 100 publications

(67 citation statements)

References 13 publications

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“…Together with Lipari and Salina, Vulcano (Fig. 1a) forms a roughly N-S trending 5 volcanic chain, located inside a deep graben (Barberi et al 1994). This structure is linked to a regional strike-slip structure, the Aeolians-Tindari-Letoianni lithospheric discontinuity (Barberi et al 1994).…”

Section: Geological Frameworkmentioning

confidence: 97%

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The historic magmatic-hydrothermal eruption of the Breccia di Commenda, Vulcano, Italy

et al. 2012

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This is an author version of the contribution published on:Questa è la versione dell 'autore dell'opera: Gurioli, Zanella,Gioncada, Sbrana,Bulletin of Volcanology, 74, 1235-1254, DOI:10.1007. The definitive version is available at: La versione definitiva è disponibile alla URL: AbstractThe historic Breccia di Commenda (BC) explosive eruption of Vulcano (Aeolian Islands, Italy) opened with a phase that generated a grey fine ash layer dispersed to the northwest (Phase 1). The eruption continued with a dilute pyroclastic density current (PDC) that was dispersed to the east, followed by the emplacement of radially distributed, topographically controlled PDC deposits (Phase 2). The last phase of the eruption produced a sequence of accretionary lapilli and grey fine ash dispersed toward the southeast (Phase 3). The most impressive feature of the BC is its high lithic/juvenile clast ratio and the yellow color of the deposits of Phase 2. Lithic fragments are mainly hydrothermally altered rocks, in the silicic and advanced argillic facies. Juvenile fragments, ranging from 20% to 40% by volume, are mainly confined to the ash component of the deposits and comprise rhyolitic to trachyandesite, poorly to non-vesicular fragments. The fine ash fraction of the deposits is richer in S, Cu, Zn, Pb, and As than the BC juvenile lapilli and bombs, and also the juvenile 3 components of other La Fossa units, suggesting that the BC formed in the presence of an anomalously high amount of S and metals. Sulfur and metals may have been carried as aerosols by chloride-and sulfate-bearing micro-crystals, derived from the condensation of magmatic gas in the eruptive cloud. The high content of hydrothermally altered lithic clasts in the deposits suggests that explosions involved the fluid-saturated hydrothermally altered rocks residing in the conduit zone. However, the presence of a juvenile component in the deposits supports the idea that this explosion may have been triggered by the ascent of new magma.We categorize this eruption as magmatic-hydrothermal, to emphasize that in this type of phreatomagmatic eruption the external water was an active hydrothermal system.Rock magnetic temperatures of non-altered lava lithic fragments indicate a uniform deposit temperature for the PDC deposits of between 200 and 260 °C, with a maximum at 280 °C.These homogeneous, relatively low temperatures are consistent with the idea that the Phase 2 explosions involved the expansion of abundant steam from the flashing of the hydrothermal system. In addition, recent paleomagnetic dating of the BC provides an age of between 1000and 1200 AD, younger than that reported in the previously published data, suggesting that previous interpretations and the recent history of La Fossa and Mt. Pilato require reevaluation.

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Section: Geological Frameworkmentioning

confidence: 97%

“…Vulcano is a volcanic complex belonging to the Quaternary Aeolian island arc (Barberi et al 1994). Together with Lipari and Salina, Vulcano (Fig.…”

Section: Geological Frameworkmentioning

confidence: 99%

The historic magmatic-hydrothermal eruption of the Breccia di Commenda, Vulcano, Italy

et al. 2012

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“…1). The NNW-SSE striking Tindari-Letojanni fault system defines the alignment of volcanoes (Barberi et al 1994, Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…1). Re-activation of the fault during the middle-to latePleistocene caused recent volcanism in the central arc (Barberi et al 1994;Gvirtzman and Nur 2001;Ventura 2013). Lipari rises~600 m above sea level and lies on 20-km-thick continental crust (Finetti and Morelli 1973).…”

Section: Geological Settingmentioning

confidence: 99%

Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands)

2018

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The Rocche Rosse lava flow marks the most recent rhyolitic extrusion on Lipari island (Italy), and preserves evidence for a multi-stage emplacement history. Due to the viscous nature of the advancing lava (10 8 to 10 10 Pa s), indicators of complex emplacement processes are preserved in the final flow. This study focuses on structural mapping of the flow to highlight the interplay of cooling, crust formation and underlying slope in the development of rhyolitic lavas. The flow is made up of two prominent lobes, small (< 0.2 m) to large (> 0.2 m) scale folding and a channelled geometry. Foliations dip at 2-4°over the flatter topography close to the vent, and up to 30-50°over steeper mid-flow topography. Brittle faults, tension gashes and conjugate fractures are also evident across flow. Heterogeneous deformation is evident through increasing fold asymmetry from the vent due to downflow cooling and stagnation. A steeper underlying topography mid-flow led to development of a channelled morphology, and compression at topographic breaks resulted in fold superimposition in the channel. We propose an emplacement history that involved the evolution through five stages, each associated with the following flow regimes: (1) initial extrusion, crustal development and small scale folding; (2) extensional strain, stretching lineations and channel development over steeper topography; (3) compression at topographic break, autobrecciation, lobe development and medium scale folding; (4) progressive deformation with stagnation, large-scale folding and refolding; and (5) brittle deformation following flow termination. The complex array of structural elements observed within the Rocche Rosse lava flow facilitates comparisons to be made with actively deforming rhyolitic lava flows at the Chilean volcanoes of Chaitén and Cordón Caulle, offering a fluid dynamic and structural framework within which to evaluate our data.

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“…Salina is at the crossing point between WNE-ESE trending faults and the NW-SE trending TindariLetojanni-Malta (TLM) transcurrent fault system. A series of graben and horst structures were developed along the TLM fault system [52], forming pull-apart basins. Horst-graben structures favour the formation of intracrustal magma chambers, most probably at the margins of tilted crustal blocks.…”

Section: Comparison With Nearby Aeolian Islands Of Alicudi and Salinamentioning

confidence: 99%

Oxygen Isotopic Variations in the Clinopyroxene from the Filicudi Volcanic Rocks (Aeolian Islands, Italy): Implications for Open-System Magma Evolution

Santo¹,

Peccerillo²

2008

TOMJ

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Oxygen isotope data are reported for clinopyroxene phenocrysts from volcanic rock samples from Filicudi island, Italy, with the aim of investigating mechanisms of magma evolution and mantle source characteristics in a continental arc volcano. Filicudi rocks range from calc-alkaline basalt to high-K andesite and dacite. Mafic rocks have MgO 6-7 wt%, Mg# 60, Ni < 50 ppm and Cr < 200 ppm, suggesting they represent evolved melts from more primitive mantle-derived parents. Variations of Sr-Nd isotope ratios against silica and MgO suggest magma evolution under opensystem. Oxygen isotope ratios on clinopyroxene phenocrysts from representative rocks are in the range 18 O cpx = + 5.37 to + 6.20 ‰ SMOW, corresponding to 18 O melt = + 5.6 to + 6.4 ‰ and display an overall, but poorly defined, positive correlation with 87 Sr/ 86 Sr and MgO and a rough negative correlation with SiO 2 . Basalts exhibit the highest 18 O cpx values for the volcanic series studied. Together, major, trace element and isotopic data indicate complex, multistage polybaric evolutionary processes for the Filicudi magmas. A process of fractional crystallisation, accompanied by variable degrees of crustal assimilation, best explains the isotopic and petrological data of the Filicudi volcanics. Evolution processes are inferred to have occurred in distinct magma reservoirs sited at different depths. Magma contamination affected basalts more extensively than andesitic and dacitic magmas. This was a consequence of the higher temperature and lower viscosity of mafic melts that were able to assimilate higher amounts of crustal wall rocks. Therefore, andesites and dacites preserved stable and radiogenic isotopic compositions more closely than basalts. Combined trace element and isotopic data suggest that primitive magmas at Filicudi were generated in a heterogeneous and metasomatised mantle source, which underwent contamination by slab-derived fluids. When compared with the nearby islands, isotopic variations of Filicudi rocks resemble more closely those found at Alicudi than at Salina and Vulcano. This suggests that the same kind of evolutionary processes occurred in the western island of Filicudi and Alicudi, whereas at Salina and Vulcano, in the central arc, magmas typically evolved by AFC processes, generating derivative melts that display higher Sr-O isotope compositions compared to parent basalts. These contrasting styles of magma evolution may be related to different structures of the plumbing systems of volcanic islands that were constructed in different sectors of the arc.

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The deep structure of the Eolian arc (Filicudi-Panarea-Vulcano sector) in light of gravity, magnetic and volcanological data

Cited by 100 publications

References 13 publications

The historic magmatic-hydrothermal eruption of the Breccia di Commenda, Vulcano, Italy

The historic magmatic-hydrothermal eruption of the Breccia di Commenda, Vulcano, Italy

Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands)

Oxygen Isotopic Variations in the Clinopyroxene from the Filicudi Volcanic Rocks (Aeolian Islands, Italy): Implications for Open-System Magma Evolution

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