Geochemistry and argon thermochronology of the Variscan Sila Batholith, southern Italy: source rocks and magma evolution

Ayuso, Robert A.; Messina, Antonia; Vivo, Benedetto De; Russo, Selma; Woodruff, Laurel G.; Sutter, John F.; Belkin, Harvey E.

doi:10.1007/bf00307732

Cited by 49 publications

(37 citation statements)

References 60 publications

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“…Emplacement depths obtained by Al-in-hornblende barometry range from 8 to 18 km, and confi rm that the intermediate crust was a preferential site for the emplacement of granitoid magmas (Caggianelli et al, 1997;Liotta et al, 2004). Using the 40 Ar/ 39 Ar method on hornblende and muscovite, Ayuso et al (1994) estimated ages ranging from 293 to 289 Ma for these plutonic rocks. Graessner et al (2000), using the U-Pb method on monazite, obtained emplacement ages of 304-300 Ma.…”

Section: Geological Settingmentioning

confidence: 93%

“…The compositions of granitoids range from monzogranite to tonalite (Ayuso et al, 1994), but minor mafi c rocks (norite, diorite, quartz diorite) (Caggianelli et al, 1994) and strongly peraluminous leucogranite (Caggianelli et al, 2003) can be also found. Emplacement depths obtained by Al-in-hornblende barometry range from 8 to 18 km, and confi rm that the intermediate crust was a preferential site for the emplacement of granitoid magmas (Caggianelli et al, 1997;Liotta et al, 2004).…”

Section: Geological Settingmentioning

confidence: 97%

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Dike magmatism in the Sila Grande (Calabria, southern Italy): Evidence of Pennsylvanian–Early Permian exhumation

et al. 2010

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A dike network transecting a basement of intrusive and metamorphic rocks\ud related to the Hercynian orogeny is exposed in the Sila Grande (southern\ud Italy). Dike magmatism, similarly to other regions of the western\ud Mediterranean, such as Sardinia, Corsica, and Catalonia, is of\ud calc-alkaline to alkali-calcic affinity. Zircon U-Pb geochronology\ud indicates that dike magmatism took place between 295 +/- 1 to 277 +/- 1\ud Ma, after the main late Hercynian emplacement of granitoids (306 +/- 1\ud Ma). Barometry indicates that the basement underwent exhumation of 8 +/-\ud 3 km before dike injection. The dike network has a geometrical\ud arrangement consistent with a transtensional stress regime that resulted\ud in ductile thinning of the lower crust during the late stage of the\ud Hercynian orogeny and concurrent fracturing of the upper crust that made\ud possible magma ascent through dikes. The proposed tectonic evolution is\ud related to dismemberment of the southern Hercynian belt in the central\ud Mediterranean area as a result of dextral transtension of Gondwana in\ud relation to Laurasia during the Pennsylvanian-Early Permian

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Section: Geological Settingmentioning

confidence: 93%

Section: Geological Settingmentioning

confidence: 97%

Dike magmatism in the Sila Grande (Calabria, southern Italy): Evidence of Pennsylvanian–Early Permian exhumation

et al. 2010

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“…This indicates that the deformation event exceeded the metamorphic peak that was reached at 300-304 Ma (Gräßner et al 2000). Deformation was active during the crystallisation of the granitoids that, according to 40 Ar/ 39 Ar datings of hornblende in the tonalites of Mesoraca, took place at 293 Ma (Ayuso et al 1994). The minimum date for the end of deformation is given by the cooling age of the pegmatitic dykes (265 Ma; Festa et al 2001) crosscutting the mylonitic foliation.…”

Section: Discussionmentioning

confidence: 98%

“…Their emplacement depths range from 8 to 18 km (Caggianelli et al 1997). The age of the granitoids, deduced by the 40 Ar/ 39 Ar method on hornblende and muscovite (Ayuso et al 1994) and by the U-Pb method on zircon and monazite (Gräßner et al 2000), ranges from 304 to 290 Ma. The contact between granitoids and high-grade metamorphic rocks is characterised by a migmatitic border zone (Rottura et al 1990).…”

Section: Geological Settingmentioning

confidence: 99%

“…1), which consists of several syn-to post-tectonic granitoids (Ayuso et al 1994) intruded into low-to high-grade metapelites, mainly represented by phyllites and migmatitic paragneisses. Granitoids show calc-alkaline affinity and composition varying from tonalite to two-mica leucogranite (Caggianelli and Prosser 2001, with references therein).…”

Section: Introductionmentioning

confidence: 99%

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Mid-crustal shear zone evolution in a syn-tectonic late Hercynian granitoid (Sila Massif, Calabria, southern Italy)

Liotta

Festa

Caggianelli

et al. 2004

Int J Earth Sci (Geol Rundsch)

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By means of petrogrological, meso- and microstructural analyses, the fabric of a syn-tectonic late Hercynian K-feldspar megacryst-bearing granodiorite is described in this paper. The granodiorite was emplaced at 293 Ma within migmatitic paragneisses which had reached the regional peak metamorphic conditions at 304–300 Ma. The granodiorite and the migmatitic paragneisses are both affected by the same ductile shear zone. In the core of the shear zone, mylonites show a clear grain-size reduction and microstructures related to deformation at high to medium temperature conditions. Migmatitic paragneisses, foliated granodiorites and mylonites mostly show concordant lineation and foliation orientations. In addition, the preferred orientation of euhedral feldspars in granodiorites indicates that the fabric anisotropy started to develop in the magmatic state. These features strongly suggest that shear deformation was active during crystallisation of granitoids and continued under subsolidus conditions. In wall rocks and mylonites, kinematic indicators such as - and -type porphyroclasts, S/C fabrics, shear bands and quartz (c) axis orientations suggest a top-to-the-W sense of shear. This is similar to the magma flow direction indicated by the tiling of euhedral feldspar megacrysts in granodiorites. Shear deformation developed, preferentially, by partitioning of strain in the granodioritic crystal mush. Geobarometry indicates that deformation took place at middle crustal levels (P=400–500 MPa). Whole rock-white mica Rb/Sr geochronological analysis of an undeformed pegmatite, crosscutting the mylonitic foliation, provided an age of 265 Ma. Timing of deformation is therefore bracketed between 293 Ma and 265 Ma

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Cooling and exhumation history of deep-seated and shallow level, late Hercynian granitoids from Calabria

Caggianelli

Prosser

Moro³

2000

Geol. J.

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Geochemistry and argon thermochronology of the Variscan Sila Batholith, southern Italy: source rocks and magma evolution

Cited by 49 publications

References 60 publications

Dike magmatism in the Sila Grande (Calabria, southern Italy): Evidence of Pennsylvanian–Early Permian exhumation

Dike magmatism in the Sila Grande (Calabria, southern Italy): Evidence of Pennsylvanian–Early Permian exhumation

Mid-crustal shear zone evolution in a syn-tectonic late Hercynian granitoid (Sila Massif, Calabria, southern Italy)

Cooling and exhumation history of deep-seated and shallow level, late Hercynian granitoids from Calabria

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