Geochemistry and Sr–Nd isotopic compositions of mantle xenoliths from the Monte Vulture carbonatite–melilitite volcano, central southern Italy

Downes, Hilary; Kostoula, T.; Jones, AP; Beard, Andy; Thirlwall, M. F.; Bodinier, Jean-Louis

doi:10.1007/s00410-002-0383-4

Cited by 74 publications

(48 citation statements)

References 58 publications

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“…Terrains average, Rudnick and Fountain, 1995) relative to the REE, and high LREE-MREE/HREE ratio (Nelson et al, 1988;Hauri et al, 1993;Downes et al, 2002). Trace element contents (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Since surface alteration does not seem to have significantly affected the VVP xenoliths, these peculiarities might reflect processes occurred in their mantle source, likely pointing to recycling of a slab-derived component with a significant pelagic sediment signature (Hawkesworth et al, 1994;Elliott et al, 1997;Kogiso et al, 1997;Green and Adam, 2003). It might imply that the VVP subcontinental mantle was also affected by metasomatic agents released by a subducting plate, e.g., the European slab (subduction-related metasomatism) (Rosenbaum et al, 1997;Downes, 2001;Downes et al, 2002). Overlapping of metasomatic processes, e.g., OIB-and slab-type, is in agreement with both the lack of Rb troughs even in samples showing geochemical patterns comparable to HIMU-OIB (VVP lavas) and the occurrence of Ti negative anomalies within the whole suite of xenoliths.…”

Section: Discussionmentioning

confidence: 99%

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Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

et al. 2006

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Petrologic and geochemical characteristics of whole rocks and minerals may be explained by metasomatism of the local mantle lithosphere induced by both alkaline magmas upwelling to the surface (OIB-like mantle diapirism) and interaction with slab-derived material. In comparison with the geochemistry of xenoliths carried by alkaline magmas in typical withinplate tectonic environments, the Veneto xenoliths record a major heterogeneity of the local lithosphere. This appears to be related to a geodynamic scenario that was previously dominated by active continental collision, in which plume-like magmatism subsequently manifested itself.

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“…Terrains average, Rudnick and Fountain, 1995) relative to the REE, and high LREE-MREE/HREE ratio (Nelson et al, 1988;Hauri et al, 1993;Downes et al, 2002). Trace element contents (Fig.…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

et al. 2006

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“…1), spinel peridotites consist of lherzolites and harzburgites, with subordinate dunites and wehrlites, which may contain phlogopite, amphibole, and carbonate. Downes et al (2002) Nd ~ 0.5121) isotopic signatures close to those of the host ultrapotassic rocks and have been suggested to represent the metasomatic veins whose melting gave ultrapotassic magmas (Conticelli, 1998).…”

Section: Geochemical Features: Xenolithsmentioning

confidence: 99%

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

2009

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We present an integrated petrological, geochemical, and geophysical model that offers an explanation for the present-day anomalously high non-volcanic deep (mantle derived) CO 2 emission in the Tyrrhenian region. We investigate how decarbonation or melting of carbonate-rich lithologies from a subducted lithosphere may affect the efficiency of carbon release in the lithosphere-asthenosphere system. We propose that melting of sediments and/or continental crust of the subducted Adriatic-Ionian (African) lithosphere at pressure greater than 4 GPa (130 km) may represent an efficient mean for carbon cycling into the upper mantle and into the exosphere in the Western Mediterranean area. Melting of carbonated lithologies, induced by the progressive rise of mantle temperatures behind the eastward retreating Adriatic-Ionian subducting plate, generates low fractions of carbonate-rich (hydrous-silicate) melts. Due to their low density and viscosity, such melts can migrate upward through the mantle, forming a carbonated partially molten CO 2 -rich mantle recorded by tomographic images in the depth range from 130 to 60 km. Upwelling in the mantle of carbonate-rich melts to depths less than 60 -70 km, induces massive outgassing of CO 2 . Buoyancy forces, probably favored by fluid overpressures, are able to allow migration of CO 2 from the mantle to the surface, through deep lithospheric faults, and its accumulation beneath the Moho and within the lower crust. The present model may also explain CO 2 enrichment of the Etna active volcano. Deep CO 2 cycling is tentatively quantified in terms of conservative carbon mantle flux in the investigated area. IntroductionThe role of Earth degassing in present-day global carbon budget and consequent climate effects has been focused chiefly on volcanic emissions (e.g. Gerlach, 1991a;Varekamp and Thomas, 1998, Kerrick, 2001). The non-volcanic 1 escape of CO 2 from the upper mantle, from crustal carbonate rocks, from hydrocarbon accumulations, and from geothermal fields is not considered in the budgets of natural release processes (cf. IPCC reports). However, the impact of these processes on atmospheric CO 2 budget is relevant if considered at the regional scale.Italy constitutes an extraordinary example of massive CO 2 subaerial fluxes in the Western Mediterranean region (e.g. Chiodini et al., 1999Chiodini et al., , 2004Rogie et al., 2000;Chiodini and Frondini 2001;Minissale, 2004). In Italy, CO 2 emissions occur both in those areas of young or active volcanism (e.g. the Tyrrhenian border of Central Italy; Fig. 1), and at zones in which there is no evidence of magmatic activity, such as Central and Southern Apennines (Fig. 1).Interactions between magmas and carbonate rocks at walls of magma chambers locally contribute CO 2 in some recent and active volcanic zones (e.g., Alban Hills, Mt. Ernici, Vesuvius;Federico and Peccerillo, 2002; Iacono Marziano et al., 2007a, b). However, the bulk of present-day soil degassing in Italy is a regional feature affecting both volcanic areas and z...

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“…Data are from Conticelli et al (1987Conticelli et al ( , 1991Conticelli et al ( , 1997Conticelli et al ( , 2002Conticelli et al ( , 2007Conticelli et al ( , 2009aConticelli et al ( , 2009bConticelli et al ( , 2010aConticelli et al ( , 2010bConticelli et al ( , 2011Conticelli et al ( , 2013Conticelli et al ( , 2015a Conticelli & Peccerillo (1992), Orsi et al (1995), Civetta et al (1997), Ayuso et al (1998), Conticelli (1998), D'Antonio et al (1999a, Castorina et al (2000), Mascle et al (2001), Pappalardo et al (1999Pappalardo et al ( , 2002a, Gasperini et al (2002), Perini et al (2000Perini et al ( , 2003Perini et al ( , 2004, Downes et al (2002), Bell et al (2004Bell et al ( , 2013, ), Cadeaux et al (2005), De Astis et al (2006, Peccerillo & Martinotti (2006), Di Rienzo et al (2007, 2008, Owen (2007), Avanzinelli et al (2008Avanzinelli et al ( , 2012aAvanzinelli et al ( , 2014, …”

Section: Excursion Notesmentioning

confidence: 99%

“…The debate has focussed on two main possible genetic mechanisms: a) within-plate origin partial melting of an up-rising mantle plume (e.g., Vollmer & Hawkesworth, 1981;Vollmer, 1989;Ayuso et al, 1998;Castorina et al, 2000;Gasperini et al, 2002;Bell et al, 2004Bell et al, , 2013; b) orogenic to post-orogenic partial melting of the sub-continental lithospheric metasomatised mantle at a destructive plate margin, with contributions from recycled sediments (e.g., Peccerillo, 1985Peccerillo, , 1999Peccerillo, , 2001Peccerillo, , 2005aRogers et al, 1986;Beccaluva et al, 1991;Conticelli & Peccerillo, 1992;Downes et al, 2002;Conticelli et al, 2004Conticelli et al, , 2007Conticelli et al, , 2015aBianchini et al, 2008). Some of the authors suggesting a within-plate origin also point out the need for an increasing influence of an upper crustal geochemical component northward, although no convincing reasons have been provided to explain…”

Section: Origin Of Italian Magmatismmentioning

confidence: 99%

The Vesuvius and the other volcanoes of Central Italy

Avanzinelli¹,

Cioni²,

Conticelli³

et al. 2017

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Geochemistry and Sr–Nd isotopic compositions of mantle xenoliths from the Monte Vulture carbonatite–melilitite volcano, central southern Italy

Cited by 74 publications

References 58 publications

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

Carbonate metasomatism and CO2 lithosphere–asthenosphere degassing beneath the Western Mediterranean: An integrated model arising from petrological and geophysical data

The Vesuvius and the other volcanoes of Central Italy

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