The Fate of High-Angle Dipping Slabs in the Subduction Factory: an Integrated Trace Element and Radiogenic Isotope (U, Th, Sr, Nd, Pb) Study of Stromboli Volcano, Aeolian Arc, Italy

Tommasini, Simone; Heumann, A.; Avanzinelli, Riccardo; Francalanci, L.

doi:10.1093/petrology/egm066

Cited by 58 publications

(52 citation statements)

References 97 publications

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“…4). Taken as a whole, the MIs signature extends the compositional range defined by Stromboli bulk-rock samples (Ellam et al 1989;Francalanci et al 1993;Tommasini et al 2007) (Plank and Langmuir 1998, and references therein). By contrast, a more restricted range of 208 Pb/ 206 Pb is shown by Aeolian lava samples, which describe a linear array pointing toward the FOZO end-member on one side and to the Calabrian basement on the other side (Fig.…”

Section: Lead Isotopic Composition Of Melt Inclusionsmentioning

confidence: 70%

“…It has also been suggested that an additional component, probably lower crust or enriched lithospheric mantle, contributed to modify the mantle source beneath Stromboli (Francalanci et al 2004;Tonarini et al 2001b). According to Tommasini et al (2007), the genesis of the different magma series at Stromboli has taken place in a mantle source which experienced two distinct enrichment events triggered by slab-released fluids. By investigation of U-Th disequilibria, Tommasini and coauthors constrained the timing for the first metasomatic event driven by supercritical fluids at [435 ka; a second metasomatic event, driven by aqueous fluids that escaped from the shallower sector of the subducted slab, probably occurred *100 ka BP.…”

Section: Introductionmentioning

confidence: 99%

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Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

Schiavi

Kobayashi

Nakamura

et al. 2011

Contrib Mineral Petrol

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We studied the elemental and isotopic (Pb, B and Li isotopes) composition of melt inclusions hosted in highly forsteritic ) olivines that were collected from San Bartolo lava and pumice (ST79p, ST82p and ST531p) samples erupted by Stromboli in historical times. The studied melt inclusions have primitive calcalkaline to shoshonitic basaltic compositions. They cover a compositional range far wider than that exhibited by the wholerocks and differ in key trace element ratios. San Bartolo melt inclusions are characterized by lower incompatible trace element abundances, higher ratios between fluidmobile (B, Pb, U and LILE) and less fluid-mobile (REE, Th, HFSE) elements and lower La/Yb ratios relative to the pumice-hosted melt inclusions and pumiceous melts erupted during paroxysmal events. Trace elements, along with different Pb, B and Li isotopic signatures, attest to source heterogeneity on the small scale and provide new insights into subducted components beneath Stromboli. Results of a mixing model suggest that metasomatism of the mantle source of pumice-hosted melt inclusions was driven by solute-rich high-pressure fluids (\20%) expelled from the deep portion of the slab. Heterogeneous Pb isotopic composition together with light d 11 B (-8.6 to -13.7%) and d 7 Li (?2.3 to -1.7%) indicates that high-pressure liquids were released in variable proportions from highly dehydrated metabasalts and metasediments. On the other hand, the elemental and isotopic (d 11 B * -1.9 to -5.9%) composition of San Bartolo melt inclusions is better explained by the addition of a prevalent aqueous component (*2 to 4%) escaped at shallower depths from sediments and altered basaltic crust in almost equivalent proportions, with a smaller contribution by high-pressure fluids. Owing to the high-angle dip of the subducted cold Ionian slab, aqueous fluids and high-pressure fluids would rise through the mantle wedge and locally superimpose on each other, thus giving origin to variously metasomatized mantle domains.

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Section: Lead Isotopic Composition Of Melt Inclusionsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

Schiavi

Kobayashi

Nakamura

et al. 2011

Contrib Mineral Petrol

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show abstract

“…This all suggests that fluids released by a MORB-type slab and metasediments were responsible for source metasomatism in this area (e.g. Tommasini et al 2007;Peccerillo et al 2013). The increase in potassium from Stromboli to Vesuvius suggests that the bulk of potassium was released away from the subduction front.…”

Section: Stromboli and Campania Volcanoesmentioning

confidence: 87%

“…6, Gioncada et al (2003). 7, Francalanci et al (1989Francalanci et al ( , 2013; Tommasini et al (2007). 8, Paone (2008); Conticelli et al (2010).…”

Section: Petrological Geochemical and Isotopic Characteristics Of Mamentioning

confidence: 99%

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Peccerillo

Frezzotti

2015

JGS

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Abstract:The Plio-Quaternary magmatism in the Tyrrhenian Sea area exhibits wide compositional variations, which cover almost entirely those observed for volcanic rocks worldwide. Some volcanoes (Etna, Iblei, Sardinia, etc.) range from tholeiitic to Na-alkaline, and display elemental and isotope signatures typical of FOZO and EM-1 ocean-island basalts (OIB). Other volcanoes (Aeolian Arc, Italian peninsula) range from calc-alkaline-shoshonitic to K-alkaline, exhibit typical 'subduction-related' trace element signatures (low Ta-Nb, high Rb-Cs-LREE), and show a large range of radiogenic isotope ratios, from mantle-like in the Aeolian Arc to crustal-like in central Italy. Geochemical data suggest that OIB-type magmatism originated in lithosphere-asthenosphere sources that were unaffected by recent subduction. In contrast, subduction-related magmas come from mantle sources that underwent Eocene to present mixing with various amounts and types of subducted crustal components. Fluxing of the mantle wedge by water-rich fluids from a mid-ocean ridge basalt-type slab occurred in the southern Tyrrhenian Sea, whereas interaction between peridotite and various types of sediments occurred in central Italy. These contrasting styles of mantle contaminations relate to the nature (oceanic or continental) of the foreland, slab geometry and pre-metasomatic mantle compositions, which vary greatly along the Apennine arc and are the reason for the formation of the wide variety of orogenic magmas in Italy.

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“…The comparison of these ratios with subducted sediments have suggested that the latter are recycled as melts (e.g., Elliott et al, 1997;Hawkesworth et al, 1997;Class et al, 2000;Elliott, 2003;Plank, 2005) enriched in Th and incompatible trace elements, but still depleted in HFSE, probably due to the occurrence of residual rutile during sediment partial melting (e.g., Elliott et al, 1997;Tommasini et al, 2007). At sub-arc temperatures and pressures the physical distinction between fluids and melts is lost above the 'second critical end point of saturation' (e.g., Kessel et al, 2005;Hermann et al, 2006) where they converge to a 'supercritical liquid', but 'fluid'-like and 'melt'-like liquids can still be distinguished using the relative proportion of H 2 O and solute contents, depending upon the temperature of 'supercritical liquid' formation (e.g., Hermann et al, 2006).…”

Section: Excursion Notesmentioning

confidence: 99%

The Vesuvius and the other volcanoes of Central Italy

Avanzinelli¹,

Cioni²,

Conticelli³

et al. 2017

GFT

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The Fate of High-Angle Dipping Slabs in the Subduction Factory: an Integrated Trace Element and Radiogenic Isotope (U, Th, Sr, Nd, Pb) Study of Stromboli Volcano, Aeolian Arc, Italy

Cited by 58 publications

References 97 publications

Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

The Vesuvius and the other volcanoes of Central Italy

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