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Late-Proterozoic to Paleozoic history of the peri-Gondwana Calabria-Peloritani Terrane inferred from a review of zircon chronology - PubMed

  • ️Fri Jan 01 2016

Review

Late-Proterozoic to Paleozoic history of the peri-Gondwana Calabria-Peloritani Terrane inferred from a review of zircon chronology

Annamaria Fornelli et al. Springerplus. 2016.

Abstract

U-Pb analyses of zircon from ten samples of augen gneisses, eight mafic and intermediate metaigneous rocks and six metasediments from some tectonic domains along the Calabria-Peloritani Terrane (Southern Italy) contribute to knowledge of peri-Gondwanan evolution from Late-Proterozoic to Paleozoic times. All samples were equilibrated under amphibolite to granulite facies metamorphism during the Variscan orogeny. The zircon grains of all considered samples preserve a Proterozoic memory suggestive of detrital, metamorphic and igneous origin. The available data fit a frame involving: (1) Neoproterozoic detrital input from cratonic areas of Gondwana; (2) Pan-African/Cadomian assemblage of blocks derived from East and West African Craton; (3) metamorphism and bimodal magmatism between 535 and 579 Ma, within an active margin setting; (4) rifting and opening of Ordovician basins fed by detrital input from the assembled Cadomian blocks. The Paleozoic basins evolved through sedimentation, metamorphism and magmatism during the Variscan orogeny involving Palaeozoic and pre-Paleozoic blocks. The Proterozoic zircon records decidedly decrease in the high grade metamorphic rocks affected by Variscan pervasive partial melting.

Keywords: Calabria–Peloritani Terrane; Detrital provenance; Pre-Cambrian to Permian tectonothermal events; U–Pb zircon ages.

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Figures

Fig. 1
Fig. 1

Distribution of the studied rock Units and location of the considered samples in Calabria (southern Italy)

Fig. 2
Fig. 2

Schematic section (not in scale) of the continental Variscan crust in the Serre massif (modified from Fornelli et al. 2011a)

Fig. 3
Fig. 3

Selected zircon crystals of augen gneisses showing internal structures and spot ages. Statistically significant cluster U–Pb ages, Th–U contents and Th/U ratios are also indicated in a, b and c. In c REE pattern of zircon dated 544 Ma is reported (dotted circle indicates the analysed site). SEM images (cathodoluminescence detector) and data ages of zircons derive from Micheletti et al. (2007)

Fig. 4
Fig. 4

Histograms and probability density curves of concordant zircon ages from augen gneisses of Aspromonte–Peloritani (a) and Castagna Units (b) are reported (data from Fiannacca et al. ; Micheletti et al. 2007)

Fig. 5
Fig. 5

Histograms and probability density curves of concordant zircon ages from metagabbros and metabasites of Serre are shown (a). SEM images (VPSED, Variable Pressure Secondary Electron Detector) of dated zircons from metagabbros and metabasites of Serre are reported in b, c and d. REE patterns of metamorphic (b) and magmatic (d) zircons were also shown. Dotted circles indicate the sites of REE analyses. (data from Micheletti et al. ; Fornelli et al. ; Muschitiello 2012)

Fig. 6
Fig. 6

Histograms and probability density curves of concordant zircon ages from garnet–biotite gneisses (a) from continental crust sliver of Pollino massif (data from Laurita et al. 2014) and high-grade metasediments of Serre (b; data from Fornelli et al. 2011a). In (b) SEM images of dated zircons from high grade metasediments (from Micheletti et al. 2008) are shown (scale bar 50 μm)

Fig. 7
Fig. 7

Histograms and probability density curves of concordant zircon ages from micaschists and paragneisses of Mandatoriccio complex (a) and Aspromonte–Peloritani Unit (b) (data from Langone , Williams et al. 2012)

Fig. 8
Fig. 8

Histograms and probability density curves of inherited zircon ages in the range 1000–3400 Ma collected in the augen gneisses from Castagna (a) and Aspromonte–Peloritani (b) Units (data from Micheletti et al. ; Fiannacca et al. 2013)

Fig. 9
Fig. 9

Schematic model of geological and geochronological evolution of Calabria–Peloritani Terranes from Archean to Silurian times is shown

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