Geochronology of the medium to high-grade metamorphic units of the Peloritani Mts., Sicily

Gregorio, Sofia De; Rotolo, Silvio G.; Villa, Igor M.

doi:10.1007/s00531-003-0356-5

Cited by 27 publications

(23 citation statements)

References 17 publications

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“…These rocks represent the late Palaeozoic basement of the European plate that was thrust over the Apennine-Maghrebian chain (Giunta and Nigro, 1999;De Gregorio et al, 2003;Festa et al, 2004;Heymes et al, 2010), then deformed during the Tertiary (Monaco et al, 1996;Bonardi et al, 2002;Somma et al, 2005;Grande et al, 2009) and Quaternary (Tortorici et al, 1995;De Guidi et al, 2003;Catalano et al, 2008). Because of their geological history, the rocks are deeply fractured and weathered.…”

Section: Spatial Variablesmentioning

confidence: 99%

Landslide susceptibility assessment in the Peloritani Mts. (Sicily, Italy) and clues for tectonic control of relief processes

Guidi

Scudero

2013

Nat. Hazards Earth Syst. Sci.

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Abstract. Many destructive shallow landslides hit villages in the Peloritani Mountains area (Sicily, Italy) on 1 October 2009 after heavy rainfall. The collection of several types of spatial data, together with a landslide inventory, allows the assessment of the landslide susceptibility by applying a statistical technique. The susceptibility model was validated by performing an analysis in a test area using independent landslide information, the results being able to correctly predict more than 70% of the landslides. Furthermore, the susceptibility analysis allowed the identification of which combinations of classes, within the different factors, have greater relevance in slope instability, and afterwards associating the most unstable combinations (with a short–medium term incidence) with the endogenic processes acting in the area (huge regional uplift, fault activity). Geological and tectonic history are believed to be key to interpreting morphological processes and landscape evolution. Recent tectonic activity was found to be a very important controlling factor in landscape evolution. A geomorphological model of cyclical relief evolution is proposed in which endogenic processes are directly linked to superficial processes. The results are relevant both to risk reduction and the understanding of active geological dynamics.

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Section: Spatial Variablesmentioning

confidence: 99%

Landslide susceptibility assessment in the Peloritani Mts. (Sicily, Italy) and clues for tectonic control of relief processes

Guidi

Scudero

2013

Nat. Hazards Earth Syst. Sci.

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“…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: 94%

“…Atzori et al 1984b;Ioppolo and Puglisi 1989;Messina et al 1996), whereas others suggested that the Mandanici and Aspromonte Units represent part of a pre-Hercynian polymetamorphic basement (e.g. Ferla 1978Ferla , 2000Bouillin et al 1987) or the result of welding of different preHercynian and Hercynian terranes during the final stages of Hercynian orogeny (De Gregorio et al 2003).…”

Section: Metamorphic Conditions and Previous Geochronological Workmentioning

confidence: 95%

“…In Sicily, De Gregorio et al (2003) reported eo-Hercynian 39 Ar-40 Ar hornblende ages ranging from 420 to 350 Ma and Hercynian 39 Ar-40 Ar hornblende and muscovite ages in the range of 340-300 Ma. Nevertheless, the above authors interpret the first group of ages as the ages of pre-Hercynian magmatic cumulates that escaped complete Hercynian resetting, whereas no interpretation is provided for most of the ages of the second group.…”

Section: Metamorphic Conditions and Previous Geochronological Workmentioning

confidence: 97%

“…A similar set of inherited ages and additional Pan-African inheritance has been revealed by SHRIMP dating of zircon from a lateHercynian leucogranodiorite . De Gregorio et al (2003) obtained a wide range of Ar-Ar (stepwise heating method), Rb-Sr and U-Pb (stepwise leaching method) ages for amphibole, biotite, muscovite, K-feldspar and titanite, for samples of different rock types from the north-eastern Peloritani, starting from about 1.6-1.8 Ga up to 61-48 Ma. The latter ages are interpreted to be related to Tertiary events localized along narrow shear zones.…”

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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Proterozoic magmatic and tectonometamorphic evolution of the Taratash complex, Central Urals, Russia

Синдерн

Hetzel

Schulte

et al. 2005

Int J Earth Sci (Geol Rundsch)

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The Taratash Complex (TC) in the northernmost Bashkirian Anticlinorium (Middle Urals) is unique among the pre-Uralian polymetamorphic complexes along the eastern margin of the East European Craton because it experienced granulite facies peak metamorphic conditions (850-900°C/10 kbar). Herein, we constrain the post-granulite facies polystage evolution of the complex, which records various increments of the geodynamic history of the East European continental margin. Formation of granite and migmatite associated with amphibolite facies events are dated at 2,344±29 and 2,044±8 Ma (U-Pb, zircon) in different structural units. At 1,810±41 Ma, the TC was affected by a greenschist facies retrogressive metamorphism which was probably related to a stage of granite formation in the eastern part of the East European Craton. This is confirmed by a U-Pb-zircon age of 1,848±8 Ma obtained from a sheared granite in the adjacent Alexandrovskiy Complex (AC). Greenschist facies shear zones which separate different structural units of the TC formed before 1,350 Ma. Partial re-equilibration of RbSr-and K-Ar-isotope systems between 1,350 Ma and 1,200 Ma is attributed to fluid flow probably induced by anorogenic magmatism in the Bashkirian Anticlinorium. Meso-to Neoproterozoic basaltic dykes indicate that the TC had been exhumed to upper crustal levels at that time. Evidence for a Grenvillian event or for the Timanian orogeny which affected other pre-Uralian complexes in the Urals is lacking. Uralian orogenic shortening and thrusting on Devonian limestones is recorded by shear zones in the AC to the east of the TC and has been dated at 300 Ma (Rb-Sr, 40 Ar/ 39 Ar).

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Geochronology of the medium to high-grade metamorphic units of the Peloritani Mts., Sicily

Cited by 27 publications

References 17 publications

Landslide susceptibility assessment in the Peloritani Mts. (Sicily, Italy) and clues for tectonic control of relief processes

Landslide susceptibility assessment in the Peloritani Mts. (Sicily, Italy) and clues for tectonic control of relief processes

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

Proterozoic magmatic and tectonometamorphic evolution of the Taratash complex, Central Urals, Russia

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