Electron-microprobe dating of monazites from Western Carpathian basement granitoids: plutonic evidence for an important Permian rifting event subsequent to Variscan crustal anatexis

Abstract

Accessory monazites from 35 granitoid sam-

Polymetamorphic evolution of pelitic schists and evidence for Permian low‐pressure metamorphism in the Vepor Unit, West Carpathians

“…Although the new data prove Permian low-pressure metamorphism only in few localities within the northern Veporic basement, some preliminary constraints on the heat source can be inferred: (i) retrograde low-pressure metamorphism related with the Variscan event (Krist et al, 1992) can be ruled out, as this is inconsistent with the prograde P-T evolution and the Permian monazite ages. (ii) Contact metamorphism related with intrusion of smaller bodies of Permian granitoids (Petrı´k et al, 1995;Kotov et al, 1996;Finger et al, 2003; for locations, see Fig. 1) is not supported, because their distant location and low volume are probably incapable of providing sufficient heat for metamorphism of the studied rocks.…”

“…Tectonic sketch of the Central West Carpathians showing position of the three main units -Gemer, Vepor and Tatra. The location and extent of the so far recognized Permian granitoids in the region is indicated following Finger et al (2003). Simplified geological map of the studied area in the northern Vepor Unit modified after Biely (1992) shows the location of the investigated metapelites and the studied samples.…”

“…Recent recognition of post-Variscan crustal extension and continental rifting is associated in both regions with the S-and Atype granitoid magmatism of Permian age (e.g. Petrı´k et al, 1995;Tho¨ni, 1999;Tho¨ni & Miller, 2000;Broska & Uher, 2001;Poller et al, 2002;Finger et al, 2003). In the Austroalpine units, this magmatism has become extensively correlated with the pre-Alpine lowpressure metamorphic record (e.g.…”

“…The Variscan orogeny resulting from accretion and amalgamation of crustal blocks in the mobile zone between Gondwana and Baltica-Laurasia is documented in both areas by widespread poly-stage metamorphism and S-and I-type granitoid magmatism (e.g. Jana´k et al, 1996Jana´k et al, , 1999Petrı´k & Kohu´t, 1997;Schermaier et al, 1997;Finger et al, 2003;Faryad & Hoinkes, 2004). The Late Cretaceous Eo-Alpine orogeny resulting from a subduction-collision between the European and Apulian continental domains after the closure of the Meliata ocean indicates eclogite to ultrahigh-pressure facies conditions in the Austroalpine (Ö tztal, Koralpe-Saualpe and Pohorje) regions (e.g.…”

Mobilization of ore fluids during Alpine metamorphism: evidence from hydrothermal veins in the Variscan basement of Western Carpathians, Slovakia

“…The Variscan basement of the Gemeric unit is composed predominantly of Palaeozoic low-grade volcano-sedimentary rocks intruded by small S-type granite bodies attributed to Permian continental rifting (Broska & Uher 2001;Finger et al 2003). Remnants of an Upper Jurassic accretionary wedge (the Meliata unit) marked by relics of highpressure blueschist metamorphism (Faryad 1995a,b) occur in tectonic klippens along the southern margin.…”