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

Peccerillo, Angelo; Frezzotti, Maria Luce

doi:10.1144/jgs2014-085

Cited by 69 publications

(43 citation statements)

References 186 publications

(302 reference statements)

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“…These gaps match with major faults affecting the Apenninic wedge at the surface. They are observed in the 100 km depth slice but not documented at greater depth, and they define a slab structure consistent with the distribution of the main Plio‐Quaternary Apenninic magmatic provinces [ Peccerillo and Frezzotti , ]. Our tomography model also documents the along‐strike continuity of the Adriatic slab in the Northern Apennines, suggesting that the role of slab tearing in this latter area is possibly overestimated [e.g., Rosenbaum et al ., ].…”

Section: Discussionmentioning

confidence: 60%

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

et al. 2016

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The question of lateral and/or vertical continuity of subducted slabs in active orogens is a hot topic partly due to poorly resolved tomographic data. The complex slab structure beneath the Alpine region is only partly resolved by available geophysical data, leaving many geological and geodynamical issues widely open. Based upon a finite‐frequency kernel method, we present a new high‐resolution tomography model using P wave data from 527 broadband seismic stations, both from permanent networks and temporary experiments. This model provides an improved image of the slab structure in the Alpine region and fundamental pinpoints for the analysis of Cenozoic magmatism, (U)HP metamorphism, and Alpine topography. Our results document the lateral continuity of the European slab from the Western Alps to the central Alps, and the downdip slab continuity beneath the central Alps, ruling out the hypothesis of slab break off to explain Cenozoic Alpine magmatism. A low‐velocity anomaly is observed in the upper mantle beneath the core of the Western Alps, pointing to dynamic topography effects. A NE dipping Adriatic slab, consistent with Dinaric subduction, is possibly observed beneath the Eastern Alps, whereas the laterally continuous Adriatic slab of the Northern Apennines shows major gaps at the boundary with the Southern Apennines and becomes near vertical in the Alps‐Apennines transition zone. Tear faults accommodating opposite‐dipping subductions during Alpine convergence may represent reactivated lithospheric faults inherited from Tethyan extension. Our results suggest that the interpretations of previous tomography results that include successive slab break offs along the Alpine‐Zagros‐Himalaya orogenic belt might be proficiently reconsidered.

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Section: Discussionmentioning

confidence: 60%

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

et al. 2016

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“…Here the rather sharp posteriors translate into small errors in the estimation of the geothermal gradient in most of the locations ( σ <1 °C/km). Interestingly, we derive high thermal gradients, between 30 and 40 °C/km, for stations located in the Tuscan magmatic province where “orogenic” magmatism took place in the last 8.5 Ma, related to the westward subduction of the Adriatic plate and formation of the Apenninic orogen (Peccerillo & Frezzotti, ). The chemical signatures of both intrusive and extrusive magmatic products indicate heterogeneous mantle sources with the contamination of crustal melts and fractional crystallization within the crust.…”

Section: Discussionmentioning

confidence: 83%

Inferring Crustal Temperatures Beneath Italy From Joint Inversion of Receiver Functions and Surface Waves

et al. 2019

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Temperature distribution at depth is of key importance for characterizing the crust, defining its mechanical behavior and deformation. Temperature can be retrieved by heat flow measurements in boreholes that are sparse, shallow, and have limited reliability, especially in active and recently active areas. Laboratory data and thermodynamic modeling demonstrate that temperature exerts a strong control on the seismic properties of rocks, supporting the hypothesis that seismic data can be used to constrain the crustal thermal structure. We use Rayleigh wave dispersion curves and receiver functions, jointly inverted with a transdimensional Monte Carlo Markov Chain algorithm, to retrieve the VS and VP/VS within the crust in the Italian peninsula. The high values (>1.9) of VP/VS suggest the presence of filled‐fluid cracks in the middle and lower crust. Intracrustal discontinuities associated with large values of VP/VS are interpreted as the α−β quartz transition and used to estimate geothermal gradients. These are in agreement with the temperatures inferred from shear wave velocities and exhibit a behavior consistent with the known tectonic and geodynamic setting of the Italian peninsula. We argue that such methods, based on seismological observables, provide a viable alternative to heat flow measurements for inferring crustal thermal structure.

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“…We collected mafic samples on the islands of Alicudi, Filicudi, Salina, and Stromboli based on previous studies [e.g., Francalanci et al, 2013;Lucchi et al, 2013aLucchi et al, , 2013bLucchi et al, , 2013d] that suggested that the units collected are not only the most mafic but also they do not show any important evidence of crustal contamination. Peccerillo and Frezzotti [2015] demonstrated that samples with MgO 3.5 wt. % do not show significant evidence of crustal interaction in their incompatible elements ratios and radiogenic isotope signatures.…”

Section: Methodsmentioning

confidence: 99%

Contrasting sediment melt and fluid signatures for magma components in the Aeolian Arc: Implications for numerical modeling of subduction systems

Zamboni

Gazel

Ryan

et al. 2016

Geochem Geophys Geosyst

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The complex geodynamic evolution of Aeolian Arc in the southern Tyrrhenian Sea resulted in melts with some of the most pronounced along the arc geochemical variation in incompatible trace elements and radiogenic isotopes worldwide, likely reflecting variations in arc magma source components. Here we elucidate the effects of subducted components on magma sources along different sections of the Aeolian Arc by evaluating systematics of elements depleted in the upper mantle but enriched in the subducting slab, focusing on a new set of B, Be, As, and Li measurements. Based on our new results, we suggest that both hydrous fluids and silicate melts were involved in element transport from the subducting slab to the mantle wedge. Hydrous fluids strongly influence the chemical composition of lavas in the central arc (Salina) while a melt component from subducted sediments probably plays a key role in metasomatic reactions in the mantle wedge below the peripheral islands (Stromboli). We also noted similarities in subducting components between the Aeolian Archipelago, the Phlegrean Fields, and other volcanic arcs/arc segments around the world (e.g., Sunda, Cascades, Mexican Volcanic Belt). We suggest that the presence of melt components in all these locations resulted from an increase in the mantle wedge temperature by inflow of hot asthenospheric material from tears/windows in the slab or from around the edges of the sinking slab.

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

Cited by 69 publications

References 186 publications

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

Inferring Crustal Temperatures Beneath Italy From Joint Inversion of Receiver Functions and Surface Waves

Contrasting sediment melt and fluid signatures for magma components in the Aeolian Arc: Implications for numerical modeling of subduction systems

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