Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia)

Vozárová, Anna; Šmelko, Miloš; Paderin, I. P.

doi:10.2478/v10096-009-0032-1

Cited by 26 publications

(47 citation statements)

References 22 publications

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“…This time range defines a dispersion of the main volcanic events in the Permian of the NGU sedimentary basin. Similar U-Pb zircon ages were received from the Southern Gemeric acid volcanites (273.3± 2.8 Ma and 275.3± 2.9 Ma, respectively; Vozárová et al 2009b), as well as from the rhyolite-dacites of the Northern Veporic Unit (273± 6 Ma and 279± 4 Ma; Vozárová et al 2010) and the Gemeric granites (Finger & Broska 1999;Kohút & Stein 2005;Radvanec et al 2009). Analogous zircon ages, ranging from 279.6± 1.1 Ma to 274.1± 1.6 Ma, were reported by Bargossi et al (2004) from the Bolzano Volcanic Complex in the Southern Alps.…”

Section: Discussionmentioning

confidence: 71%

First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology

Vozárová¹,

Presnyakov²,

Šarinová³

et al. 2015

Geologica Carpathica

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Several magmatic events based on U-Pb zircon geochronology were recognized in the Permian sedimentary succession of the Northern Gemeric Unit (NGU). The Kungurian magmatic event is dominant. The later magmatism stage was documented at the Permian-Triassic boundary. The detrital zircon assemblages from surrounding sediments documented the Sakmarian magmatic age. The post-orogenic extensional/transtensional faulting controlled the magma ascent and its emplacement. The magmatic products are represented by the calc-alkaline volcanic rocks, ranging from basaltic metaandesite to metarhyolite, associated with subordinate metabasalt. The whole group of the studied NGU Permian metavolcanics has values for the Nb/La ratio at (0.44-0.27) and for the Nb/U ratio at (9.55-4.18), which suggests that they represent mainly crustal melts. Magma derivation from continental crust or underplated crust is also indicated by high values of Y/Nb ratios, ranging from 1.63 to 4.01. The new 206 U-238 Pb zircon ages (concordia age at 269 ± 7 Ma) confirm the dominant Kungurian volcanic event in the NGU Permian sedimentary basin. Simultaneously, the Permian-Triassic boundary volcanism at 251 ± 4 Ma has been found for the first time. The NGU Permian volcanic activity was related to a polyphase extensional tectonic regime. Based on the new and previous U-Pb zircon ages, the bulk of the NGU Permian magmatic activity occurred during the Sakmarian and Kungurian. It was linked to the post-orogenic transpression/transtension tectonic movements that reflected the consolidation of the Variscan orogenic belt. The Permian-Triassic boundary magmatism was accompanied by extension, connected with the beginning of the Alpine Wilson cycle.

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Section: Discussionmentioning

confidence: 71%

First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology

Vozárová¹,

Presnyakov²,

Šarinová³

et al. 2015

Geologica Carpathica

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“…is not constrained by radiometric dating on the mantle rocks, the timing of continental crust extension at the margin of the Meliata Basin is well defined by the ages of S-and A-type Permian granites (Putiš et al 2000;Radvanec et al 2009b) as well as calc-alkaline and A-type volcanites (Kotov et al 1996;Vozárová et al 2009). The magmatism is an indicator that the crust, with the underlying mantle lithosphere, could have been melted due to extension above a subduction zone, and, after delamination, during the riftogenesis (Fig.…”

Section: The Age Of the E1 To E4 Eventsmentioning

confidence: 99%

The blueschist-associated perovskite-andradite-bearing serpentinized harzburgite from Dobšiná (the Meliata Unit), Slovakia

Putiš¹,

Koppa²,

Snarska³

et al. 2013

J. Geosci.

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Unique, perovskite(Prv)-andradite(Adr)-bearing serpentinized harzburgite fragments occur in Late Jurassic-Early Cretaceous subduction-accretionary wedge complex of the Meliata tectonic Unit (Slovakia, Western Carpathians). These rocks reflect magmatic (E1) and partial melting (E2) mantle events followed by metamorphic blueschist-facies (E3) and fluid-rock interaction (E4) events accompanied by crystallization of Prv and/or Adr. The incompletely solidified slightly depleted (residual) harzburgite composed of early-magmatic assemblage of Ol, Opx 1 , Cr-Spl ± Cpx 1 (E1 event) underwent partial melting (E2 event) under subsolidus mantle conditions. The late-magmatic aggregates of Cpx 2 , Cr-Spl, scarce Opx 2 , due to this batch melting, occur around the Opx 1 (±Cpx 1 ) porphyroclasts. The fractures and cleavage planes of the kinked Opx 1 porphyroclasts are filled by Cpx 3 as a result of subsolidus recrystallization of the Opx 1 . Cloudy lower Al Cpx 4 associated with pargasite in reaction rims between the Opx 1 and Cpx 2 , or antigorite replacing Ol, could represent the E3 high-pressure metamorphic event (dated at 160 to 150 Ma, according to published 40 Ar- 39Ar data for "phengitic" white mica from blueschists) in serpentinites. Serpentinized zones of harzburgite contain Prv, which occurs in serpentinized Opx 1 porphyroclasts. Orthopyroxene (Opx 1 ) breakdown and formation of Prv, (Ti-rich) Adr and chrysotile appears to be postdating the closure of the Meliata back-arc basin (c. 200 to 160 Ma) and HP metamorphism. Perovskite genesis can therefore be bound to the exhumation-related serpentinization in subduction channel and emplacement of serpentinites into subduction-accretionary wedge (E4 event at 300-500 ºC/5-15 kbar, at 150 to 130 Ma?). The bulk-rock trace-element patterns suggest enrichment in LREE, Ba, Cs, U, Pb, Sb and Li in comparison with HREE, HFSE, Rb and Sr. Such element mobility indicates fluid-rock interaction. Pervading aqueous fluids rich in CO 2 were transporting Ca, Ti, Fe, LREE partitioned into Prv grown along the Cpx exsolution lamellae in Opx 1 . The sources of such fluids might have been the blueschist-to greenschist-facies rocks from the Meliata mélange type subduction-accretionary wedge. The late-metamorphic H 2 O-CO 2 /Si-Fe-Mn-rich fluids caused partial replacement of Prv by pyrophanite and crystallization of (Ti-rich) Adr at the expense of Cpx and Prv. : harzburgite, blueschist, perovskite, andradite, fluid-rock interaction, Meliata Back-arc Basin Received: 22 July 2012; accepted: 23 December 2012; handling editor: E. Jelínek The online version of this article (http://dx.doi.org/10.3190/jgeosci.128) contains supplementary electronic material. Keywords

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“…In comparison to the Northern Gemericum realm, this Guadalupian age (Wordian/Capitanian) refers to the relatively younger stage of rift-related extensional movement and derived volcanism. Equally, in the lithologically closest Southern Gemeric domain, the zircon population from the Rožňava Formation acid volcanites gave an older age of 275 Ma (Vozárová et al 2009a). In the wide Alpine-Dinarides realm the Middle Permian (Guadalupian) movements are related to the beginning of the Alpine sedimentary cycle (Krainer 1993;Filipovič et al 2003;Vozárová et al 2009b).…”

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confidence: 99%

Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the implications for geodynamic evolution (Western Carpathians, Slovakia)

Vozárová¹,

Šmelko²,

Paderin³

et al. 2012

Geologica Carpathica

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U-Pb dating (SHRIMP) of magmatic zircon ages from the Northern Gemericum Permian volcanics (Petrová Hora Formation) yielded the Concordia age of 272.4 ± 7.3 Ma for basaltic andesite, as well as the Concordia age of 275.2 ± 4 Ma for rhyodacites. Both zircon ages correspond to the Cisuralian Epoch in the time span of the Kungurian Stage. Acquired 206 Pb/ 238 U zircon age data support the nearly contemporaneous origin of the acid and basic volcanogenic members in the Northern Gemericum Permian strata. The bimodal volcanic suite proves the transtension/extension tectonic regime in the North Gemeric sedimentary basin during the Late Cisuralian. The magmatic zircon ages of rhyodacites, occurring in the lower thrust sheet of the Bôrka Nappe (Jasov Formation), gave a younger Concordia age of 266 ± 1.8 Ma proving the Guadalupian Epoch, in the time span of the Wordian/Capitanian. In comparison to the Northern Gemericum realm, this age refers to the relatively younger stage of rift-related extensional movements. In the wide Alpine-Dinarides realm the Middle Permian (Guadalupian) movements are related to the beginning of the Alpine sedimentary cycle. Thus, the Middle Permian rifting expresses the beginning of the formation of the future Meliata oceanic trough.

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Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia)

Cited by 26 publications

References 22 publications

First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology

First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology

The blueschist-associated perovskite-andradite-bearing serpentinized harzburgite from Dobšiná (the Meliata Unit), Slovakia

Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the implications for geodynamic evolution (Western Carpathians, Slovakia)

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