A 3D Vs model of the upper mantle beneath Italy: Insight on the geodynamics of central Mediterranean

Giacomuzzi, G.; Civalleri, M.; Gori, Pasquale De; Chiarabba, C.

doi:10.1016/j.epsl.2012.05.004

Cited by 75 publications

(77 citation statements)

References 74 publications

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“…7c). This scenario is similar to the current situation of the Adria plate, which subducts underneath Italy (short slab) and the Dinarides (long slab; Gvirtzman and Nur, 2001;Di Stefano et al, 2009;Giacomuzzi et al, 2012). The Adria plate now moves as a whole towards the Dinarides, causing rapid extension east of the Apennines (Devoti et al, 2008;Weber et al, 2010).…”

Section: Middle Triassic (240-220 Ma)mentioning

confidence: 70%

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

et al. 2015

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Abstract. Conflicting interpretations of the > 500 km long, east-west-trending Qiangtang metamorphic belt have led to very different and contradicting models for the PermoTriassic tectonic evolution of central Tibet. We define two metamorphic events, one that only affected pre-Ordovician basement rocks and one subduction-related Triassic highpressure metamorphism event. Detailed mapping and structural analysis allowed us to define three main units that were juxtaposed due to collision of the north and south Qiangtang terranes after closure of the Ordovician-Triassic ocean that separated them. The base is formed by the Precambrian-Carboniferous basement, followed by nonmetamorphic ophiolitic mélange containing mafic rocks that range in age from the Ordovician to Middle Triassic. The top of the sequence is formed by strongly deformed sedimentary mélange that contains up to > 10 km size rafts of both unmetamorphosed Permian sediments and highpressure blueschists. We propose that the high-pressure rocks were exhumed from underneath the south Qiangtang terrane in an extensional setting caused by the pull of the northward subducting slab of the Shuanghu-Tethys. Highpressure rocks, sedimentary mélange and margin sediments were thrust on top of the ophiolitic mélange that was scraped off the subducting plate. Both units were subsequently thrust on top of the south Qiantang terrane continental basement. Onset of Late Triassic sedimentation marked the end of the amalgamation of both Qiangtang terranes and the beginning of spreading between Qiantang and north Lhasa to the south, leading to the deposition of thick flysch deposits in the Jurassic.

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Section: Middle Triassic (240-220 Ma)mentioning

confidence: 70%

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

et al. 2015

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“…Notably, a slab window has been also modelled by geophysical data (e.g. Chiarabba et al 2008;Neri et al 2009;Giacomuzzi et al 2012), providing an interesting case of similar conclusions reached by distinct and independent geochemical and geophysical investigations. The geochemical affinities between Stromboli and Campania support a geodynamic model suggesting that a single continuous slab was initially subducting beneath the southern Apennines and the eastern Aeolian Arc, from the Apulia block to the Ionian Sea.…”

Section: Geodynamic Implicationsmentioning

confidence: 90%

“…However, the occurrence of subducted crust has been amply documented by V P -V S anomalies all along the Apennine-Maghrebian chain (e.g. Panza et al 2007;Chiarabba et al 2008;Neri et al 2009;Faccenna et al 2011;Giacomuzzi et al 2012).…”

Section: Summary Of the Geodynamic Evolution Of The Tyrrhenian Sea Areamentioning

confidence: 99%

“…It should be noted that the foreland in this sector of the Apennines is represented by the Adriatic plate, which has continental-type characteristics, distinct from the oceanic-type Ionian Sea foreland (e.g. Panza et al 2007;Giacomuzzi et al 2012;Speranza et al 2012).…”

Section: The Roman Provincementioning

confidence: 99%

“…Doglioni et al 1999;Wortel & Spakman 2000;Faccenna et al 2001Faccenna et al , 2004Faccenna et al , 2014Di Stefano et al 2009;Neri et al 2009;Carminati et al 2010;Giacomuzzi et al 2012). However, the significance of along-strike compositional variation of the magmatism has received little attention.…”

mentioning

confidence: 99%

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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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Hints on the deformation penetration induced by subductions and collision processes: Seismic anisotropy beneath the Adria region (Central Mediterranean)

2013

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[1] Adria is a small region surrounded by three mountain belts: the Alps, the Apennines, and the Dinarides, built up by long evolution of subduction and collisional systems. We present 253 shear wave splitting measurements obtained by studying more than 100 teleseismic events for 12 stations. SKS splitting measurements show 3-D complexity and quite strong upper mantle deformation. We carefully analyzed results in terms of back azimuthal coverage and interpret measurements as related to Adria rotation and to subductions evolution. In the northern part of Adria, the anisotropy pattern follows the arcuate shape of the Alps; the same pattern, parallel to the mountains, occurs along the Apennines, but fast directions show a sudden change in the Adria foreland. This lateral variation has been analyzed to isolate a distinct Adria mantle anisotropic pattern, which is identified as NE-SW fast direction along the western microplate boundary and as N-S fast direction at Trieste. This pattern might be induced by drag effect of the counterclockwise rotation of Adria lithosphere that behaves as an independent microplate as identified by GPS data. Our measurements suggest that the geodynamic process that generated the Alps is more efficient deforming a larger volume of mantle than its Apennine counterpart. Moreover, the mantle circulation we hypothesize looking at the regional-scale patterns of anisotropy requires the existence of an escape route beneath the Alps-Apennines transition, through which the mantle flows and feed circulation in the Tyrrhenian mantle system as suggested by previous geodynamic models and as seen by some tomographic studies.

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A 3D Vs model of the upper mantle beneath Italy: Insight on the geodynamics of central Mediterranean

Cited by 75 publications

References 74 publications

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

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

Hints on the deformation penetration induced by subductions and collision processes: Seismic anisotropy beneath the Adria region (Central Mediterranean)

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