New evidence of mantle heterogeneity beneath the Hyblean Plateau (southeast Sicily, Italy) as inferred from noble gases and geochemistry of ultramafic xenoliths

Correale, Alessandra; Martelli, M.; Paonita, Antonio; Rizzo, Andrea Luca; Brusca, L.; Scribano, Vittorio

doi:10.1016/j.lithos.2011.11.007

Cited by 40 publications

(71 citation statements)

References 56 publications

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“…Etna (Armienti et al, 2004;Tonarini et al, 2001;Viccaro and Cristofolini, 2008 Fig. 7 also shows the isotopic data of Hyblean mantle peridotite and pyroxenite xenoliths (Bianchini et al, 2010;Correale et al, 2012;Tonarini et al, 1996) (Marty et al, 1994;Nuccio et al, 2008 He ratio in atmosphere of 1.39 × 10…”

Section: Sr-nd Isotopesmentioning

confidence: 95%

“…He and Ne were analyzed by a Helix-SFT device, while Ar was analyzed by an Argus machine. We adopted the procedure described in Correale et al (2012) and Nuccio et al (2008).…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…4). For comparison with a potential reference mantle source, we report also the REE pattern of Hyblean peridotites (data from Correale et al, 2012;Sapienza and Scribano, 2000). The patterns are comparable, although our products are richer in REE relative to Hyblean xenoliths.…”

Section: Major and Trace Elementsmentioning

confidence: 99%

“…6; data from Armienti et al, 2004;Coltelli et al, 2005;Corsaro et al, 2009;Viccaro and Cristofolini, 2008) for products from the same eruptions, confirming a homogeneous composition. The investigated products are compared to literature data for tholeiitic, pre-and post-1971 alkaline lavas (Armienti et al, 2004;Corsaro and Pompilio, 2004;Cristofolini et al, 1991;D'Orazio et al, 1997;Viccaro and Cristofolini, 2008) and also mantle xenoliths (peridotites and pyroxenites; Correale et al, 2012;Sapienza and Scribano, 2000) from the Hyblean Plateau. All of our samples plot partially within the field of post-1971 alkaline lavas, with FS approaching the field for tholeiites.…”

Section: Major and Trace Elementsmentioning

confidence: 99%

“…Etna. By investigating Hyblean xenoliths, Correale et al (2012) Nd~0.5130 and Zr/Nb~30). Given these constraints the pyroxenites could be produced by crystallization of primitive melts coming from great depth and permeating the peridotitic mantle to different levels, thus representing the metasomatic agent (Correale et al, 2012;Sapienza and Scribano, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A two-component mantle source feeding Mt. Etna magmatism: Insights from the geochemistry of primitive magmas

Correale

Paonita

Martelli

et al. 2014

Lithos

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Section: Sr-nd Isotopesmentioning

confidence: 95%

“…He and Ne were analyzed by a Helix-SFT device, while Ar was analyzed by an Argus machine. We adopted the procedure described in Correale et al (2012) and Nuccio et al (2008).…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Section: Major and Trace Elementsmentioning

confidence: 99%

Section: Major and Trace Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A two-component mantle source feeding Mt. Etna magmatism: Insights from the geochemistry of primitive magmas

Correale

Paonita

Martelli

et al. 2014

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New mafic magma refilling a quiescent volcano: Evidence from He-Ne-Ar isotopes during the 2011-2012 unrest at Santorini, Greece

Rizzo

Barberi

Carapezza

et al. 2015

Geochem. Geophys. Geosyst.

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In 2011-2012, Santorini was characterized by seismic-geodetic-geochemical unrest, which was unprecedented since the most-recent eruption occurred in 1950 and led to fear an eruption was imminent. This unrest offered a chance for investigating the processes leading to volcanic reactivation and the compositional characteristics of involved magma. We have thus analyzed the He-Ne-Ar-isotope composition of fluid inclusions in olivines and clinopyroxenes from cumulate mafic enclaves hosted in cogenetic dacitic lavas of the 1570-1573 and 1925-1928 eruptions of Nea Kameni. These unique data on Aegean volcanism were compared with those of gases collected in quiescent periods and during the unrest. The 3 He/ 4 He ratios (3.1-4.0 Ra) are significantly lower than the typical arc-volcano values (R/Ra $ 7-8), suggesting the occurrence of magma contamination in Santorini plumbing system, which would further modify the 3 He/ 4 He ratio of parental magmas generated in the local metasomatized mantle. The 3 He/ 4 He values of enclaves (3.1-3.6 Ra) are comparable to those measured in gases during quiescent periods, confirming that enclaves reflect the He-isotope signature of magma residing at shallow depths and feeding passive degassing. A significant increase in soil CO 2 flux from Nea Kameni and anomalous compositional variations in the fumaroles were identified during the unrest, accordingly with previous studies. Simultaneously, 3 He/ 4 He ratios up to 4.0 Ra were also measured, demonstrating that the unrest was due to the intrusion into the shallow plumbing system of a more-primitive 3 He-rich magma, which is even volatile richer and less contaminated than mafic magma erupted as enclaves. This new intrusion did not however trigger an eruption.

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The carbon-isotope signature of ultramafic xenoliths from the Hyblean Plateau (southeast Sicily, Italy): Evidence of mantle heterogeneity

Correale

Paonita

Rizzo

et al. 2015

Geochem. Geophys. Geosyst.

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We investigated the carbon isotope composition of mantle source beneath the Hyblean Plateau (southeast Sicily, Italy) by studying CO 2 in fluid inclusions from ultramafic xenoliths recovered in some Miocene diatremes. In order to constrain the processes influencing the isotopic marker of carbon we combined d 13 C CO2 results with information about noble gases (He and Ar) obtained in a previous investigation of the same products. Although Ar/CO 2 and He/Ar ratios provide evidence of Rayleigh-type fractional degassing, the isotopic geochemistry of carbon is poorly influenced by this process. Mixing related to metasomatic processes where MORB-type pyroxenitic melts permeate a peridotite mantle probably contaminated by crustal fluids inherited from a fossil subduction can explain the measured d 13 C and CO 2 / 3 He variations, ranging from 24& to 22& and from 10 9 to 10 10 , respectively. Simple mass-balance calculations highlighted that the Hyblean peridotite source was mainly contaminated by the carbonate source, being carbonate and organic matter present at a ratio that varied within the range from 7:1 to 4:1.

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New evidence of mantle heterogeneity beneath the Hyblean Plateau (southeast Sicily, Italy) as inferred from noble gases and geochemistry of ultramafic xenoliths

Cited by 40 publications

References 56 publications

A two-component mantle source feeding Mt. Etna magmatism: Insights from the geochemistry of primitive magmas

A two-component mantle source feeding Mt. Etna magmatism: Insights from the geochemistry of primitive magmas

New mafic magma refilling a quiescent volcano: Evidence from He-Ne-Ar isotopes during the 2011-2012 unrest at Santorini, Greece

The carbon-isotope signature of ultramafic xenoliths from the Hyblean Plateau (southeast Sicily, Italy): Evidence of mantle heterogeneity

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