Lower crustal granite genesis connected with chemical fractionation in the continental crust of Calabria (Southern Italy)

Caggianelli, Alfredo; Moro, A. Del; Paglionico, A.; Piccarreta, G.; Pinarelli, L.; Rottura, A.

doi:10.1127/ejm/3/1/0159

Cited by 88 publications

(39 citation statements)

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“…This assumption is necessary because the metapelites are migmatitic and show variable restitic chemistry (Fornelli et al 2002). The composition of the Stefanaconi metapelites (average of two samples from Caggianelli et al 1991) has been assumed to reflect the parental material since the authors have proved that different restitic metapelites, on the whole, are compatible with such a pristine composition. The chemistries of the mineral phases in this pseudosection are relative to the sample Sbl6a (Acquafredda et al 2006) from the uppermost portion of the section.…”

Section: Metapelitic Migmatites Of the Upper Partmentioning

confidence: 99%

Diachronic and different metamorphic evolution in the fossil Variscan lower crust of Calabria

Fornelli

Pascazio

Piccarreta

2011

Int J Earth Sci (Geol Rundsch)

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Different P-T-t paths and Variscan tectonic evolution have been described for the lower crust of Calabria. New data have been collected through retrieval technique and construction of pseudosections to control the validity of the previous data and to check the appropriate model to describe the tectono-thermal evolution of the lower crust of the Serre (southern Calabria). The timeperiod from *350 and *270 Ma has been considered to depict the evolution from Variscan crustal thickening to exhumation as happens in the peri-Mediterranean blocks of south European Variscides and consistently with the available geochronological data. It results that: (1) P-peak at 0.9 and 1.03 GPa at the top and bottom, respectively, was reached earlier than T-peak, (2) crustal thickening developed likely earlier than 325 Ma within the stability field of kyanite, in agreement with previous studies, up to the P-peak along a geothermal gradient of about 21-22°C km -1 , (3) the T-peak of 700 and 880°C at the top and bottom, respectively, was reached in the stability field of sillimanite after a nearly isobaric heating and (4) Variscan exhumation occurred under increasing T/depth ratio and stopped 270-280 Ma ago. The P-T paths for the upper and lower portions of the section, qualitatively comparable to the numerical simulation, reflect different styles of exhumation, cooling and, according to the available geochronological data, diachronic evolution.

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Section: Metapelitic Migmatites Of the Upper Partmentioning

confidence: 99%

Diachronic and different metamorphic evolution in the fossil Variscan lower crust of Calabria

Fornelli

Pascazio

Piccarreta

2011

Int J Earth Sci (Geol Rundsch)

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“…Their Sr initial ratios of 0.7093-0.7140 and e Nd(t) values of -3.2 to -5.4 ranging from those of metabasites to those of metasediments of the lower crustal portion of the Sila Unit in northern Serre (e.g. Caggianelli et al 1991) suggest an important crustal contribution in the genesis of protoliths. The crustal contribution is supported by the presence of abundant inherited cores in zircons, which give Neoproterozoic, Palaeoproterozoic and Archaean ages.…”

Section: Discussionmentioning

confidence: 97%

Latest Precambrian to Early Cambrian U–Pb zircon ages of augen gneisses from Calabria (Italy), with inference to the Alboran microplate in the evolution of the peri-Gondwana terranes

Micheletti

Barbey²,

Fornelli

et al. 2006

Int J Earth Sci (Geol Rundsch)

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In situ U-Pb dating of zircons from five samples of Calabrian augen gneisses shows that their protoliths are Latest Precambrian to Early Cambrian in age (562 ± 15, 547 ± 7, 540 ± 4, 539 ± 16 and 526 ± 10 Ma), and contain Archaean (3.1 Ga), Palaeoproterozoic (1.7-2.4 Ga) and Neoproterozoic (0.6-0.9 Ga) inheritance. Geochemical signature of augen gneisses is typical of high-K calc-alkaline post-collisional magmatism. Their Sr-Nd isotopic compositions [0.7093 < ( 87 Sr/ 86 Sr) i < 0.7139; -3.2 < e Nd(t) < -5.4; 1.5 < T DM < 1.7 Ga] indicate the involvement of a crustal component in significant proportions. The Calabrian augen gneisses have, therefore, to be distinguished from the orthogneisses of Sardinia and northern Algeria, and from the porphyroids of Sicily, which are Middle Ordovician. By contrast, the Calabrian augen gneisses show a close similarity to the Pan-African post-collisional granitoids of the northern edge of the West African craton (e.g. the Moroccan Anti-Atlas). This suggests a periGondwana origin and corroborates previous palaeogeodynamic reconstructions attributing the Alboran microplate to the northern margin of the West African craton.

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“…Therefore, we must notice that if the actual composition of the sediment-derived component contaminating the Stromboli mantle source had a lower 208 Pb/ 206 Pb signature, an alternative explanation for the high 208 Pb/ 206 Pb ratios of San Bartolo and ST79p-hosted MIs would be required. The isotope ratios of both San Bartolo and ST79p-hosted MIs point to the composition of the Calabrian basement, in particular to the Serre Granulite studied by Caggianelli et al (1991), thus suggesting contamination by crustal materials. However, as previously mentioned, some lines of evidence point against assimilation of crustal materials (e.g., Francalanci et al 1989Francalanci et al , 1999.…”

Section: Modeling the Relative Contributions Of Subducted Componentsmentioning

confidence: 96%

Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

Schiavi

Kobayashi

Nakamura

et al. 2011

Contrib Mineral Petrol

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We studied the elemental and isotopic (Pb, B and Li isotopes) composition of melt inclusions hosted in highly forsteritic ) olivines that were collected from San Bartolo lava and pumice (ST79p, ST82p and ST531p) samples erupted by Stromboli in historical times. The studied melt inclusions have primitive calcalkaline to shoshonitic basaltic compositions. They cover a compositional range far wider than that exhibited by the wholerocks and differ in key trace element ratios. San Bartolo melt inclusions are characterized by lower incompatible trace element abundances, higher ratios between fluidmobile (B, Pb, U and LILE) and less fluid-mobile (REE, Th, HFSE) elements and lower La/Yb ratios relative to the pumice-hosted melt inclusions and pumiceous melts erupted during paroxysmal events. Trace elements, along with different Pb, B and Li isotopic signatures, attest to source heterogeneity on the small scale and provide new insights into subducted components beneath Stromboli. Results of a mixing model suggest that metasomatism of the mantle source of pumice-hosted melt inclusions was driven by solute-rich high-pressure fluids (\20%) expelled from the deep portion of the slab. Heterogeneous Pb isotopic composition together with light d 11 B (-8.6 to -13.7%) and d 7 Li (?2.3 to -1.7%) indicates that high-pressure liquids were released in variable proportions from highly dehydrated metabasalts and metasediments. On the other hand, the elemental and isotopic (d 11 B * -1.9 to -5.9%) composition of San Bartolo melt inclusions is better explained by the addition of a prevalent aqueous component (*2 to 4%) escaped at shallower depths from sediments and altered basaltic crust in almost equivalent proportions, with a smaller contribution by high-pressure fluids. Owing to the high-angle dip of the subducted cold Ionian slab, aqueous fluids and high-pressure fluids would rise through the mantle wedge and locally superimpose on each other, thus giving origin to variously metasomatized mantle domains.

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Lower crustal granite genesis connected with chemical fractionation in the continental crust of Calabria (Southern Italy)

Cited by 88 publications

References 0 publications

Diachronic and different metamorphic evolution in the fossil Variscan lower crust of Calabria

Diachronic and different metamorphic evolution in the fossil Variscan lower crust of Calabria

Latest Precambrian to Early Cambrian U–Pb zircon ages of augen gneisses from Calabria (Italy), with inference to the Alboran microplate in the evolution of the peri-Gondwana terranes

Trace element and Pb–B–Li isotope systematics of olivine-hosted melt inclusions: insights into source metasomatism beneath Stromboli (southern Italy)

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