A LA-ICP-MS study of minerals in the Rocche Rosse magmatic enclaves: Evidence of a mafic input triggering the latest silicic eruption of Lipari Island (Aeolian Arc, Italy)

Davì, M.; Rosa, Rosanna De; Barca, Donatella

doi:10.1016/j.jvolgeores.2009.02.001

Cited by 30 publications

(32 citation statements)

References 49 publications

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“…These results support a steady E-W dominant extensional regime with an overall constant eastward migration of activity. Our results are in agreement with geochemistry data that support the existence of a single, N-S elongated steady magmatic source at depth, with common composition characterizing the LVC (Davì et al, 2009(Davì et al, , 2010.…”

Section: The Magmato-tectonic Evolution Of Lipari and Vulcanosupporting

confidence: 91%

“…Petrological evidence suggests that these coeval eruptions are fed by the same magmatic system (Davì et al, 2009(Davì et al, , 2010. A shoshonitic magma from a deep reservoir (~20 km; Peccerillo et al, 2006) can directly reach the surface (i.e., Vulcanello; Davì et al, 2009) Field structural data have shown that the central Aeolian arc is controlled by three main structural systems, NE-SW, NNW-SSE and N-S trending (Mazzuoli et al, 1995;Ventura et al, 1999;De Astis et al, 2003). In particular, volcanic activity of the last thousand years on Lipari and Vulcano has been focused from vents aligned N-S and located on the eastern side of the islands.…”

Section: Geodynamic Magmatic and Structural Frameworkmentioning

confidence: 99%

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Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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The regional stress field in volcanic areas may be overprinted by that produced by magmatic activity, promoting volcanism and faulting. In particular, in strike-slip settings, the definition of the relationships between the regional stress field and magmatic activity remains elusive.To better understand these relationships, we collected stratigraphic, volcanic and structural field data along the strike-slip Central Aeolian arc (Italy): here the islands of Lipari and Vulcano separate the extensional portion of the arc (to the east) from the contractional one (to the west). We collected >500 measurements of faults, extension fractures and dikes at 40 sites. Most structures are NNE-SSW to NNW-SSE oriented, eastward dipping, and show almost pure dip-slip motion; consistent with an E-W extension direction, with minor dextral and sinistral shear. Our data highlight six eruptive periods during the last 55 ka, which allow considering both islands as a single magmatic system, in which tectonic and magmatic activity steadily migrated eastward and currently focus on a 10 km long x 2 km wide active segment. Faulting appears to mostly occur in temporal and spatial relation with magmatic events, supporting that most of the observable deformation derives from transient magmatic activity (shorter-term, days to months), rather than from steady longer-term regional tectonics (10 2 -10 4 years). More in general, the Central Aeolian case shows how magmatic activity may affect the structure and evolution of volcanic arcs, overprinting any strike-slip motion with magma-induced extension at the surface. Keypoints: Relation between strike-slip kinematics and magmatism at volcanic arcs  Two neighbour volcanic islands share a single magmatic system  Magmatic stress is dominant and generates transient faulting

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Section: The Magmato-tectonic Evolution Of Lipari and Vulcanosupporting

confidence: 91%

Section: Geodynamic Magmatic and Structural Frameworkmentioning

confidence: 99%

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

et al. 2016

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“…Bagdassarov and Dingwell 1992;Smith 1996;Stevenson et al 1996;Manga et al 1998;Griffiths 2000;Pistone et al 2016). However, the Rocche Rosse lava flow is generally a crystal-free glass (with some exceptions; Davì et al 2009Davì et al , 2010, thus crystal content is excluded from calculations. The amount of dissolved gases, preserved as bubbles in the lava flow, can also affect viscosity and flow behaviour (e.g.…”

Section: Crust Formationmentioning

confidence: 99%

“…Previous work on the Rocche Rosse has focused on fragmentation and transport mechanisms of the associated pyroclastic sequence (Dellino and La Volpe 1995), the thermal history of flow frontal ramps, i.e. ridges of fold structures extending downward into the flow by tens of metres (Gottsmann and Dingwell 2001), magmatic history (Gioncada et al 2003(Gioncada et al , 2005Davì et al 2009Davì et al , 2010 and textural heterogeneity (Gonnermann and Manga 2003;Clay et al 2013;Shields et al 2016). Ramp structures of the Rocche Rosse were also documented by Hall (1978) and Cas and Wright (1987), inferring a compressive regime and build-up of lava behind a brecciated flow front, hindering flow advance.…”

Section: Introductionmentioning

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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“…This may be related to changing physicochemical conditions through magma ascent. In fact, the composition of pyroxene depends not only on the melt composition, but also, albeit to a lesser extent, on the pressure, temperature, and volatile content during crystallization (see Davi et al, 2009). The Mg# of pyroxene decreases from the monzogabbros (average = 0.74) to the syenites (average = 0.50), and the average values show good correlation with the whole-rock compositions.…”

Section: Pyroxenementioning

confidence: 99%

Nature and physicochemical conditions of crystallization in the South Dehgolan intrusion, NW Iran: mineral-chemical evidence

Sarjoughian¹,

Kananian²,

Lentz³

et al. 2015

Turkish J Earth Sci

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The South Dehgolan intrusion in the Sanandaj-Sirjan Zone ranges in composition from calc-alkalic monzogabbro to syenite to alkalic granite. This suite is composed mainly of variable proportions of quartz, K-feldspar, plagioclase, biotite, hornblende, and pyroxene. The plagioclase composition varies between albite to labradorite. The biotites are Mg-to Fe-rich in the monzogabbro to granite, respectively. The amphiboles are calcic and the composition varies from magnesiohornblende to actinolite. Clinopyroxene compositions fall in the diopside-augite field. The average calculated near-solidus crystallization temperatures are 774 °C, 655 °C, and 775 °C for the monzogabbro-monzodiorite, syenite, and granite, respectively. Calculated average pressures of emplacement are 1.7, 1.3, and 1.9 kbar for the monzogabbro-monzodiorite, syenite, and granite rocks, respectively, crystallizing at different respective depths of about 6.7, 5.0, and 7.3 km. The interpreted oxygen fugacities in the monzogabbro-monzodiorite and syenite rocks are typical of arc magmas, with oxygen fugacities above the Ni-NiO buffer. Water contents in the monzogabbro-monzodiorite and syenite were calculated to range from 4.7 to 4.4 wt.% and in the granite is 3.8 wt.%. High water and volatile contents in the monzogabbro to syenite may have allowed the magma to reach shallower crustal levels. During the evolution of this magmatic system to higher silica contents, there was an increase in the activity of oxygen and decrease in the temperature and the emplacement depth from the monzogabbro-monzodiorite to syenite rocks; this is consistent with the typical evolution of the granitoid rocks. However, the calculated higher temperature and pressure and low ƒO 2 and H 2 O content in the later granite reflects notable differences in its origin and crystallization conditions. The range in mineral compositions is this intrusive suite is consistent with a relationship to subduction of the Neotethys oceanic crust beneath the Central Iranian microcontinent, although there was a change from calc-alkaline to alkaline magmatism.

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A LA-ICP-MS study of minerals in the Rocche Rosse magmatic enclaves: Evidence of a mafic input triggering the latest silicic eruption of Lipari Island (Aeolian Arc, Italy)

Cited by 30 publications

References 49 publications

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

Magmatic control along a strike-slip volcanic arc: The central Aeolian arc (Italy)

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

Nature and physicochemical conditions of crystallization in the South Dehgolan intrusion, NW Iran: mineral-chemical evidence

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