Crustal Contributions to Late Hercynian Peraluminous Magmatism in the Southern Calabria-Peloritani Orogen, Southern Italy: Petrogenetic Inferences and the Gondwana Connection

Fiannacca, Patrizia; Williams, Ian S.; Cirrincione, Rosolino; Pezzino, Antonino

doi:10.1093/petrology/egn035

Cited by 47 publications

(69 citation statements)

References 49 publications

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“…The abundance of such zircon inclusions (Escuder-Viruete et al 1998; Valverde-Vaquero 1 998), the intrusion of late-/post-kinematic Variscan granites in central Europe (Klein et al 2008 and references therein), the intrusion of syn-kinematic (D3) granites in the CIZ (e.g. Dias et al 1998 ;Valle Aguado et al 2005), the intrusion of late-/post-kinematic Variscan granites in the southern Variscides (Roberts et al 2000;Ledru et al 2001 ;Cocherie et al 2005 ;Fiannacca et al 2008 ;Ballevre et al 2009;Dallagiovanna et al 2009) and the granulite-facies metamorphism in the Spanish Central System lower crust (Fernandez-Suarez et al 2006;Orejana et al 2011) from the source rocks is a main characteristic of the ClZ Ordovician metaigneous rocks (Bea et a1. 2007).…”

Section: Discussionmentioning

confidence: 99%

U–Pb geochronology and zircon composition of late Variscan S- and I-type granitoids from the Spanish Central System batholith

García

Villaseca

Valverde-Vaquero³

et al. 2012

Int J Earth Sci (Geol Rundsch)

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The Spanish Central System (SCS) batholith. located in the Central Iberian Zone, is one of the largest masses of granite in the European Variscan Belt. This batholith is a composite unit of late-and post-kinematic granitoids dominated by S-and I-type series granite. with subordinate leucogranite and granodiorite. Zircon trace element contents, from two representative S-type and three I-type granitoids from the eastern portion of the SCS batholith, indicate a heterogeneous composition due to magma differentiation and co-crystallisation of other trace element-rich accessory phases. In situ. U-Pb dating of these zircons by SHRIMP and LA-ICP-MS shows 479-462-Ma inherited zircon ages in the I-type intrusions. indicating the involvement of an Ordovician rnetaigneolls protolith, while the S-type intrusions exclusively contain Cadornian and older zircon ages. The zircon crystallisation ages show that these granites have been emplaced at ca. 300 Ma with a time span between 303 ± 3 Ma and 298 ± 3 Ma. Precise dating by CA-ID-TIMS reveals a pulse at 305.7 ± 0.4 Ma and confirms the major pulse at 300.7 ± 0.6 Ma. These ages match the Permo-Carbonif erous age for granulite-fades metamorphism of the lower crust under the SCS batholith and coincide with a wide spread granitic event throughout the Southern Variscides. Ti-in zircon thermometry indicates temperatures between 844 and 784°C for both the S-and I-type granites. rein forcing the hypothesis that these granites are derived from deep crustal sources.

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Section: Discussionmentioning

confidence: 99%

U–Pb geochronology and zircon composition of late Variscan S- and I-type granitoids from the Spanish Central System batholith

García

Villaseca

Valverde-Vaquero³

et al. 2012

Int J Earth Sci (Geol Rundsch)

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“…2.5 kbar for the base of the upper crust), coeval with the lower crust (exposed in the Serre Massif, southern Calabria), the latter characterized by a peak temperature of 690-800°C at 5.5-7.5 kbar (Graeßner et al 2000 and reference therein). This metamorphic peak was nearly synchronous with the bulk of granitoid intrusions at 303-290 Ma (zircon, monazite and xenotime U-Pb ages and whole-rock and mineral Rb-Sr ages; Borsi and Dubois 1968;Borsi et al 1976, Schenk 1980Del Moro et al 1982;Graeßner et al 2000;Fiannacca et al 2008).…”

Section: Metamorphic Conditions and Previous Geochronological Workmentioning

confidence: 88%

“…The correlation between these elements is good for samples PB14 and GC30 but for sample GC13 only a poor correlation can be observed into account the lack of pre-Hercynian ages in all the analysed monazites, that would suggest an entirely Hercynian evolution of the rocks of the AspromontePeloritani Unit. On the other hand, TIMS and ion-probe U-Pb zircon Archean to Neoproterozoic-Early Cambrian ages (Schenk 1990;Micheletti et al 2007;Fiannacca et al 2008Fiannacca et al , 2009) and U-Pb titanite and Ar-Ar hornblende Proterozoic ages (De Gregorio et al 2003) are reported for magmatic and metamagmatic rocks of the same tectonic unit in both southern Calabria and north-eastern Sicily.…”

Section: Discussionmentioning

confidence: 99%

“…The most prominent rock types in the Aspromonte-Peloritani Unit, in both northern Sicily and southern Calabria, are middle crustal biotite paragneisses and augen gneisses with minor amphibolites, mica schists and marbles. The metamorphic rocks are diffusely intruded by late-Hercynian weakly to strongly peraluminous granitoids (D'Amico et al 1982;Rottura et al 1990Rottura et al , 1993Fiannacca et al 2005aFiannacca et al , 2008.…”

Section: Geological Settingmentioning

confidence: 99%

“…As for the pre-Hercynian evolution of southern Calabria-Peloritani Orogen, different authors (Schenk and Todt 1989;Schenk 1990;Micheletti et al 2007;Fiannacca et al 2008Fiannacca et al , 2009) reported U-Pb zircon data from different levels of the southern Calabrian and north-eastern Sicilian crust indicating a late Pan-African/Cadomian (600-500 Ma) crust-forming event. Micheletti et al (2007) obtained SIMS ages in the range of c. 560-525 Ma for the magmatic protoliths of Calabrian augen gneisses, with Archean (3.1 Ga), Paleoproterozoic (1.7-2.4 Ga) and Neoproterozoic (0.6-0.9 Ga) inheritance.…”

Section: Metamorphic Conditions and Previous Geochronological Workmentioning

confidence: 99%

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Age constraints on Late Paleozoic evolution of continental crust from electron microprobe dating of monazite in the Peloritani Mountains (southern Italy): another example of resetting of monazite ages in high-grade rocks

Appel

Cirrincione

Fiannacca

et al. 2010

Int J Earth Sci (Geol Rundsch)

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In situ monazite microprobe dating has been performed, for the first time, on trondhjemite and amphibolite facies metasediments from the Peloritani Mountains in order to obtain information about the age of metamorphism and intrusive magmatism within this still poorly known sector of the Hercynian Belt. All samples show single-stage monazite growth of Hercynian age. One migmatite and one biotitic paragneiss yielded monazite ages of 311 ± 4 and 298 ± 6 Ma, respectively. These ages fit with previous age determinations in similar rocks from southern Calabria, indicating a thermal metamorphic peak at about 300 Ma, at the same time as widespread granitoid magmatism. The older of the two ages might represent a slightly earlier event, possibly associated with the emplacement of an adjacent trondhjemite pluton, previously dated by SHRIMP at 314 Ma. No evidence for preHercynian events and only a little indication for some monazite crystallization starting from ca. 360 Ma were obtained from monazite dating of the metasediments, suggesting either a single-stage metamorphic evolution or a significant resetting of the monazite isotope system during the main Hercynian event (ca. 300 Ma). Rare monazite from a trondhjemite sample yields evidence for a lateHercynian age of about 275 Ma. This age is interpreted as representing a post-magmatic stage of metasomatic monazite crystallization, which significantly postdates the emplacement of the original magmatic body.

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Isotopic evolution of prehistoric magma sources of Mt. Etna, Sicily: Insights from the Valle Del Bove

Kempton

Spence

Downes

et al. 2021

Contrib Mineral Petrol

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Mount Etna in NE Sicily occupies an unusual tectonic position in the convergence zone between the African and Eurasian plates, near the Quaternary subduction-related Aeolian arc and above the down-going Ionian oceanic slab. Magmatic evolution broadly involves a transition from an early tholeiitic phase (~ 500 ka) to the current alkaline phase. Most geochemical investigations have focussed on either historic (> 130-years old) or recent (< 130-years old) eruptions of Mt. Etna or on the ancient basal lavas (ca. 500 ka). In this study, we have analysed and modelled the petrogenesis of alkalic lavas from the southern wall of the Valle del Bove, which represent a time span of Mt. Etna’s prehistoric magmatic activity from ~ 85 to ~ 4 ka. They exhibit geochemical variations that distinguish them as six separate lithostratigraphic and volcanic units. Isotopic data (143Nd/144Nd = 0.51283–0.51291; 87Sr/86Sr = 0.70332–0.70363; 176Hf/177Hf = 0.28288–0.28298; 206Pb/204Pb = 19.76–20.03) indicate changes in the magma source during the ~ 80 kyr of activity that do not follow the previously observed temporal trend. The oldest analysed Valle del Bove unit (Salifizio-1) erupted basaltic trachyandesites with variations in 143Nd/144Nd and 87Sr/86Sr ratios indicating a magma source remarkably similar to that of recent Etna eruptions, while four of the five subsequent units have isotopic compositions resembling those of historic Etna magmas. All five magma batches are considered to be derived from melting of a mixture of spinel lherzolite and pyroxenite (± garnet). In contrast, the sixth unit, the main Piano Provenzana formation (~ 42–30 ka), includes the most evolved trachyandesitic lavas (58–62 wt% SiO2) and exhibits notably lower 176Hf/177Hf, 143Nd/144Nd, and 206Pb/204Pb ratios than the other prehistoric Valle del Bove units. This isotopic signature has not yet been observed in any other samples from Mt. Etna and we suggest that the parental melts of the trachyandesites were derived predominantly from ancient pyroxenite in the mantle source of Etna.

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Crustal Contributions to Late Hercynian Peraluminous Magmatism in the Southern Calabria-Peloritani Orogen, Southern Italy: Petrogenetic Inferences and the Gondwana Connection

Cited by 47 publications

References 49 publications

U–Pb geochronology and zircon composition of late Variscan S- and I-type granitoids from the Spanish Central System batholith

U–Pb geochronology and zircon composition of late Variscan S- and I-type granitoids from the Spanish Central System batholith

Age constraints on Late Paleozoic evolution of continental crust from electron microprobe dating of monazite in the Peloritani Mountains (southern Italy): another example of resetting of monazite ages in high-grade rocks

Isotopic evolution of prehistoric magma sources of Mt. Etna, Sicily: Insights from the Valle Del Bove

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