Origin and significance of the Permian high-K calc-alkaline magmatism in the central-eastern Southern Alps, Italy

Rottura, A.; Bargossi, Giuseppe Maria; Caggianelli, Alfredo; Moro, A. Del; Visonà, Dario; Tranne, Claudio Antonio

doi:10.1016/s0024-4937(98)00038-3

Cited by 121 publications

(81 citation statements)

References 50 publications

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“…However, unlike arc-type rocks, the whole studied NGU Permian volcanics display a distinct negative Ba anomaly with respect to the adjacent Rb and Th. Such enrichment of Rb and Th relative to Ba has also been observed in the Permian high-K calc-alkaline magmatism in the Southern Alps (Rottura et al 1998), in the extension-related Permian calc-alkaline andesites from the Pyrenees (Broutin et al 1994), in the Permian post-orogenic volcanites in the Apuseni Mts (Nicolae et al 2014), as well as in the Lower Triassic alkaline rhyolites of the Silicum Unit in the Western Carpathians (Uher et al 2002). The observed enrichment of Rb and Th relative to Ba cannot be considered in these samples as an effect due to the influence of hydrothermal fluids, since Ba and Rb show a similar mobility and Th is considered immobile.…”

Section: Geochemistrymentioning

confidence: 73%

“…No doubt, these zircon grains were redeposited as clastic detritus from the coeval volcanic centers into the sedimentary basin and they mixed with spatially widespread non-volcanic detritus, and even could have been reworked in the younger Permian sediments. Thus, the NGU Permian bulk igneous activity, as in many other areas of the Central and Southern European Variscides (Rottura et al 1998;Vozárová et al 2010; Errors are 1-sigma; Pb c and Pb* indicate the common and radiogenic portions, respectively. Error in Standard calibration was 0.73 % (not included in above errors but required when comparing data from different mounts (Vozárová & Túnyi 2003) and silicic volcanites in the Bôrka Nappe (260 Ma; Vozárová et al 2012).…”

Section: Discussionmentioning

confidence: 98%

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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: Geochemistrymentioning

confidence: 73%

Section: Discussionmentioning

confidence: 98%

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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“…This seems to be the main tectonic regime at the time of the infilling of the Stephanian basins along these faults [Basile, 2006]. As the same volcanism systematically occurred in all the basins along the Sillon Houiller fault [Letourneur, 1953], it can be proposed that the Lacapelle- [Innocent et al, 1994;Rottura et al, 1998;Cannic et al, 2002;]. It is noteworthy that these geochemical characteristics were homegeneous during a large time span and in various parts of the Variscan belt.…”

Section: Alteration and Elemental Mobilitymentioning

confidence: 99%

“…Gibson et al, 1993;Innocent et al, 1994;Rottura et al, 1998]. However, the Stephanian volcanism occurred in a strike-slip tectonic regime in the French Massif central, and before the main Permian extension that ended the variscan orogenic cycle [Ménard and Molnar, 1988].…”

Section: Alteration and Elemental Mobilitymentioning

confidence: 99%

Potassic late orogenic Stephanian volcanism in the Southwest French Massif central (Decazeville, Figeac, Lacapelle-Marival basins): an example for mantle metasomatism along strike-slip faults?

Lapierre¹,

Basile

Berly

et al. 2008

Bulletin De La Société Géologique De France

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In the southwestern part of the French Massif central (Decazeville basin, at the Sillon Houiller fault termination; Figeac and Lacapelle-Marival basins along the Argentat fault), Stephanian volcanism exhibits shoshonitic affinities. Their chondrite-normalized rare earth element (REE) patterns are enriched in light REE, but almost flat for heavy REE, with marked negative Eu anomalies. Primitive mantle-normalized element spectra show negative Nb, Ta, P, Sm, Ti, and positive Th, U, Pb anomalies, respectively. εNd values are negative and homogeneous (−6 to −4). This volcanism shares the same geochemical patterns as the late-orogenic Stephanian-Permian magmatism from the southern part of the Variscan belt (Pyrénées, Alps, Sardinia). We explain these geochemical characteristics as resulting from the partial melting of a metasomatised mantle. We propose a new mechanism to explain this melting process: horizontal displacement along the main late-orogenic strike-slip faults might bring into contact a hydrated lower crust with the lithospheric mantle. Mantle metasomatism within the strike-slip fault zone may then induce partial melting.

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“…Referencia régiók: óceáni ívek tholeites (tholeiite-TH), mészalkáli (calc-alkaline-CA) nagy K-tartalmú mészalkáli (high-K calc-alkaline-HK-CA) lávái, köpeny régió, átlag N-MORB (Rottura et al 1998 alapján) és kontinentális litoszférikus köpeny (continental lithospheric mantle-CLM) (McDonough 1990 alapján).…”

Section: áBraunclassified

A Ditrói Alkáli Masszívum ultramafikus kumulátum kőzeteinek petrogenetikája

Almási

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Origin and significance of the Permian high-K calc-alkaline magmatism in the central-eastern Southern Alps, Italy

Cited by 121 publications

References 50 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

Potassic late orogenic Stephanian volcanism in the Southwest French Massif central (Decazeville, Figeac, Lacapelle-Marival basins): an example for mantle metasomatism along strike-slip faults?

A Ditrói Alkáli Masszívum ultramafikus kumulátum kőzeteinek petrogenetikája

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