The geochemical evolution of the Mt. Somma-Vesuvius volcano

Paone, Angelo

doi:10.1007/s00710-005-0103-7

Cited by 26 publications

(15 citation statements)

References 74 publications

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“…fract" show the compositional trends in residual melt which would result from clinopyroxene and olivine crystallization, respectively. For comparison, the bulk composition of the pumices erupted during the plinian phase of the PB-Sarno eruption [17,21], the bulkcompositions of lavas erupted between 35-25 ka [17,19], of lava and scoria erupted after 25 ka but before the PB-Sarno eruption [19], and compositions of melt inclusions hosted in clinopyroxene from lava erupted between 35 ka and the PB-Sarno eruption [29] are also plotted.…”

Section: Discussionmentioning

confidence: 99%

“…The products of the first megacycle are slightly silica-saturated (K-trachyte, K-latite) evolving toward slightly silica-undersaturated [17,18]. The products of the second mega-cycle are mildly silicaundersaturated (phonotephrites to phonolites; [15,17,19]). The third mega-cycle is characterized by strongly silicaundersaturated rocks with tephrite to tephriphonolitefoidite composition [15,19].…”

Section: Geological Settingmentioning

confidence: 99%

“…The products of the second mega-cycle are mildly silicaundersaturated (phonotephrites to phonolites; [15,17,19]). The third mega-cycle is characterized by strongly silicaundersaturated rocks with tephrite to tephriphonolitefoidite composition [15,19]. Each mega-cycle is made up of several shorter cycles, each starting with a plinian or sub-plinian eruption, followed by a strombolian-vulcanian "interplinian" stage.…”

Section: Geological Settingmentioning

confidence: 99%

“…bulk rock compositions of pumices erupted during the plinian phase of the PB-Sarno eruption [17,21] 2. bulk compositions of lavas erupted between 35-25 ka [17,19] 3. bulk rock compositions of lava and scoria erupted after 25 ka but before the PB-Sarno eruption [19] 4. compositions of MI in clinopyroxene from lavas erupted between 35-25 ka, as well as compositions of MI from lavas that are younger than 25 ka but older than the PB-Sarno eruption [29] The various types of data listed above have been plotted along with our MI data on various chemical discrimination diagrams, including total alkali-SiO 2 classification diagram ( Fig. 5a; [30]), primitive mantle normalized [31] trace element diagrams ( Fig.…”

Section: Melt Inclusionsmentioning

confidence: 99%

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Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Klébesz¹,

Bodnar

Vivo

et al. 2012

Open Geosciences

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Nodules (coarse-grain "plutonic" rocks) were collected from the ca. 20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma-Vesuvius, Italy. The nodules are classified as monzonite-monzogabbro based on their modal composition. The nodules have porphyrogranular texture, and consist of An-rich plagioclase, K-feldspar, clinopyroxene (ferroan-diopside), mica (phlogopite-biotite) ± olivine and amphibole. Aggregates of irregular intergrowths of mostly alkali feldspar and plagioclase, along with mica, Fe-Ti-oxides and clinopyroxene, in the nodules are interpreted as crystallized melt pockets. Crystallized silicate melt inclusions (MI) are common in the nodules, especially in clinopyroxenes. Two types of MI have been identified. Type I consists of mica, Fe-Ti-oxides and/or dark green spinel, clinopyroxene, feldspar and a vapor bubble. Volatiles (CO 2 , H 2 O) could not be detected in the vapor bubbles by Raman spectroscopy. Type II inclusions are generally lighter in color and contain subhedral feldspar and/or glass and several opaque phases, most of which are confirmed to be oxide minerals by SEM analysis. Some of the opaque-appearing phases that are below the surface may be tiny vapor bubbles. The two types of MI have different chemical compositions. Type I MI are classified as phono-tephrite -tephri-phonolite -basaltic trachy-andesite, while Type II MI have basaltic composition. The petrography and MI geochemistry led us to conclude that the nodules represent samples of the crystal mush zone in the active plumbing system of Mt. Somma-Vesuvius that were entrained into the upwelling magma during the PB-Sarno eruption.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Melt Inclusionsmentioning

confidence: 99%

See 2 more Smart Citations

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Klébesz¹,

Bodnar

Vivo

et al. 2012

Open Geosciences

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“…Bell et al 2004;Peccerillo and Lustrino 2005). Thus, the B-Be and Li geochemistry may potentially help to identify the enrichment agent in volcanoes like Somma-Vesuvius, characterized by deep and complex magmatic reservoirs where mantle-derived magma arrives, stagnates and differentiates (Paone 2006). In this context, Somma-Vesuvius has been revisited, since an understanding of the B-Be-Li elements and B isotopes may shed light on the processes which link the behaviour of these elements in both the subducted slab and the mantle wedge beneath this volcano (e.g.…”

Section: Introductionmentioning

confidence: 98%

Fractional crystallization models and B–Be–Li systematics at Mt Somma-Vesuvius volcano (Southern Italy)

Paone

2008

Int J Earth Sci (Geol Rundsch)

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A compilation of B-Be-Li data on rocks that cover the entire eruptive history of Somma-Vesuvius is presented and interpreted in the light of evolution models for the Somma-Vesuvius rocks. Using major and trace element data, fractional crystalllization models are presented for different geochemical units. These data were used to constrain the source mineralogy of the Somma-Vesuvius rocks (ol-opx-cpx-gar-amp of 0.4-0.3-0.1-0.1-0.1), the amount of sediment added (5-10%) and the melt fraction from batch partial melting computations (0.05-0.1). From the B-Li data it is inferred that the main process responsible for the B isotopic signature is sediment recycling. However, the B-Li data show a major variation in Li abundances respect to B which is explained with Li dehydration before the fluid enriched the mantle wedge that produced the arc magmas. The Somma-Vesuvius B isotope composition is intermediate between that of the Campi Flegrei and the broad field of the Eolian Island arc. A low Be isotopes in the recent volcanic rocks can be explained as: (a) the top 1-22 m of the incoming sediment is accreted, (b) large amounts of sediment erosion, (c) a slow rate of subduction which have provoked a long magmatic history for the Vesuvius magma, (d) the sediment component takes several Myr longer than the subducting plate to reach the magma source region beneath Italy.

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Evidence of a shallow water submarine hydrothermal field off Zannone Island from morphological and geochemical characterization: Implications for Tyrrhenian Sea Quaternary volcanism

Martorelli

Italiano²,

Ingrassia

et al. 2016

JGR Solid Earth

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Discoveries from multibeam bathymetry and geochemical surveys performed off Zannone Island (western Pontine Archipelago, Tyrrhenian Sea) provide evidence of an undocumented hydrothermal field characterized by ongoing fluid emissions and morphologically complex giant depressions located in shallow water (<150 m water depth). Based on a detailed morpho‐bathymetric study we identify the seabed morphologies produced by hydrothermal fluid emission activity. We recognize five giant depressions (length >250 m) that host pockmarks, mounds, small cones, and active fluid vents, which are interpreted as complex fluid‐escape features developed both through vigorous‐explosive events and steady seepage. Their spatial distribution suggests that the NE‐SW trending faults bounding the Ponza‐Zannone structural high and the shallow fractured basement are favorable conditions for the upward migration of hydrothermal fluids. Moreover, we performed a detailed geochemical study to investigate the source of the hydrothermal fluids. The geochemical signature of the collected fluids provides information of active CO2‐dominated degassing with a significant contribution of mantle volatiles, with measured 3He/4He values > 3.0 Ra that are similar to those recorded at Stromboli and Panarea volcanoes. The hydrothermal system produces volatiles that may originate from residual magma batches, similar to the Pleistocene trachytes cropping out in the SE sector of Ponza Island that were probably intruded in the shallow crustal levels and never erupted. The discovery of the Zannone hydrothermal field updates the record of active hydrothermal areas of the Mediterranean Sea. Moreover, the recognition of several giant hydrothermal depressions characterized by a complex morphology is peculiar for the Mediterranean Sea.

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The geochemical evolution of the Mt. Somma-Vesuvius volcano

Cited by 26 publications

References 74 publications

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Fractional crystallization models and B–Be–Li systematics at Mt Somma-Vesuvius volcano (Southern Italy)

Evidence of a shallow water submarine hydrothermal field off Zannone Island from morphological and geochemical characterization: Implications for Tyrrhenian Sea Quaternary volcanism

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