Nephelinitic to Tholeiitic Magma Generation in a Transtensional Tectonic Setting: an Integrated Model for the Iblean Volcanism, Sicily

Beccaluva, Luigi; Siena, Franca; Coltorti, Massimo; Grande, A. Di; Ronsivalle, Vincenzo; Macciotta, G.; Tassinari, Renzo; Vaccaro, Carmela

doi:10.1093/petroj/39.9.1547

Cited by 68 publications

(51 citation statements)

References 68 publications

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“…Thermobaric constraints for the modeling were a pressure of~1 GPa and a temperature of about 1260°C. This pressure is compatible with the reported pressure at the depth from which Etnean magma originates (1-3 GPa; Armienti et al, 1988Armienti et al, , 2007Corsaro and Pompilio, 2004) and with microthermometric determinations of fluid inclusions in Hyblean xenoliths (about 1 GPa; Sapienza et al, 2005), while the selected temperature is in accordance with the quenching temperature of Etnean melt inclusions (up to 1240°C; Kamenetsky and Clocchiatti, 1996) and segregation temperatures (up to 1230°C for alkali basalts) estimated for Hyblean melts by Beccaluva et al (1998). Redox conditions were set at fO 2 = QFM in accordance with Perinelli et al (2008) for the local upper mantle.…”

Section: Modeling Of Source Partial Melting and Crystal Fractionationsupporting

confidence: 89%

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: Modeling Of Source Partial Melting and Crystal Fractionationsupporting

confidence: 89%

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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“…11 a Th/Yb vs Ta/Yb plot from Pearce (1983) for Procida rocks; b, c Ta vs. Zr and Ti/Y vs. Zr/Nb diagrams for Procida rocks with MgO>4 wt % compared with Roman Province and Etna, Pantelleria and Iblei rocks. Data from Ayuso et al (1998), Beccaluva et al (1998), Bianchini et al (1998), Conticelli and Peccerillo (1992), Esperanca and Crisci (1995), Corsaro et al (1996), D'Antonio et al (1999a, Tanguy et al (1997). Symbols as in Fig.…”

Section: Discussionmentioning

confidence: 99%

Procida volcanic history: new insights into the evolution of the Phlegraean Volcanic District (Campania region, Italy)

2004

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New stratigraphic, major-and trace-element, and Sr-, Nd-and Pb-isotopic data on volcanic deposits older than 14 ka from the island of Procida, Italy, are presented and compared with published analyses from the rest of the Phlegraean Volcanic District (PVD). Procida rocks range in composition from basalt to shoshonite and trachyte and show Pb ratios varying within the ranges 0. 70523-0.70678, 0.512539-0.512630, 18.99-19.29, 15.67-15.69 and 39.10-39.39, respectively. The presence of a compositional gap in the range SiO 2 =54-59 wt % is evidence of magma bimodality, and suggests that the feeding magmatic system was formed by at least two different reservoirs located at different depths. Geochemical and isotopic variations with increasing differentiation can be explained by fractional crystallization mechanisms, that in some cases were associated with crustal contamination that occurred in both deeper and shallower reservoirs; the most evolved magmas formed in the shallower one. Mixing/mingling processes also occurred. The variation of isotopic composition through time observed both for Procida and for Campi Flegrei and Ischia rocks is evidence of strong affinity between magmas that erupted on the entire PVD until about 40 ka. This indicates that they share a common origin and a common plumbing system. Most of the PVD eruptive centers active until about 40 ka lie within a NE-SWoriented volcano-tectonic belt extending from the southeastern part of Ischia, through Procida and Torregaveta volcano to the northeastern sector of the present Campi Flegrei caldera. This not only indicates the existence of a link between regional structures and volcanism in the area, but also suggests that PVD magma genesis and evolution were strongly regulated by extensional tectonics. In the last 40 ka the mafic rocks erupted along this extensional structure -from Torregaveta and the islands of Ischia and Procida -indicate that it still represents an important crustal discontinuity that focuses mantle-derived magmas. Procida trachybasalts are enriched in large ion lithophile elements (LILE) and light and middle rare earth elements (LREE and MREE), and show slight negative anomalies in the high field strength elements (HFSE) relative to average MORB. A slight depletion in HREE is present. Trace element and isotope systematics can be referred to a lithospheric mantle source. The lithospheric mantle source carries intra-plate and slabderived components, the latter probably inherited from a previous subduction event.

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“…A Miocene and a Plio-Pleistocene volcanic field are distinguished from each other. Both fields can be subdivided compositionally into three major groups: nephelinites, alkali basalts-basanites, and tholeiites (Schmincke et al 1997;Beccaluva et al 1998;Suiting and Schmincke 2010).…”

Section: Geological Settingmentioning

confidence: 99%

Iblean diatremes 3: volcanic processes on a Miocene carbonate platform (Iblean Mountains, SE-Sicily): a comparison of deep vs. shallow marine eruptive processes

Suiting

Schmincke

2011

Bull Volcanol

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Evolution and magma fragmentation processes of two contrasting, well-exposed diatreme complexes interbedded with Late Miocene calcareous marine sediments in distinct sedimentary environments of a carbonate platform (Iblean Plateau, Sicily) are compared with each other. The nephelinitic Cozzo Molino diatreme (CMD) to the east developed in shallow water (0-80 m water depth); the alkali basaltic Valle Guffari seamount (VGS) to the west grew on a deeper water carbonate ramp (150-200 m water depth). We focus on the dominant boundary conditions inferred to have governed depth of magma fragmentation and subaqueous emplacement mechanisms: water depth, physical nature of host rocks, magma composition, and inferred differences in initial volatile concentrations. There are gross similarities in the composition of the two moderately evolved magmas. The low-viscosity magmas in both diatremes were laden with xenoliths originating from mantle to lower crustal sites. Although similar, the eastern shallow water CMD was likely more volatile-rich, with magma fragmented prior to reaching the surface and the surrounding tephra cone was partly emergent. The eruptions of the entirely submarine VGS diatreme complex in the deeper water environment were dominated by interaction of soft sediment and alkali basaltic magma or a pre-fragmented volatile-particle mixture. Eruption columns were, thus, strongly damped and the submarine complex never pierced the water surface.

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Nephelinitic to Tholeiitic Magma Generation in a Transtensional Tectonic Setting: an Integrated Model for the Iblean Volcanism, Sicily

Cited by 68 publications

References 68 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

Procida volcanic history: new insights into the evolution of the Phlegraean Volcanic District (Campania region, Italy)

Iblean diatremes 3: volcanic processes on a Miocene carbonate platform (Iblean Mountains, SE-Sicily): a comparison of deep vs. shallow marine eruptive processes

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