Meliatic blueschists and their detritus in Cretaceous sediments: new data constraining tectonic evolution of the West Carpathians

Plašienka, Dušan; Méres, Štefan; Ivan, Peter; Sýkora, Milan; Soták, Ján; Lacny, Alexander; Aubrecht, Roman; Bellová, Simona; Potočný, Tomáš

doi:10.1007/s00015-018-0330-7

Cited by 23 publications

(17 citation statements)

References 72 publications

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“…This most likely heralded the final closure of the Meliata Basin following subduction of thinned continental and oceanic margin fragments including the flysch inferred mantle-type substrate (Figure 21). While some authors report the Middle Jurassic succession as a trench flysch contemporaneous with subduction and accretionary wedge formation [4,76], the deposition of a part of the succession preceded the late Middle to Late Jurassic subduction period and this is consistent with the younger 40 Ar- 39 Ar ages [80][81][82] of the blueschist HP peak phengite (160-150 Ma). The flysch formation started during a contraction period and this calciclastic flysch age was determined to Toarcian-Bajocian (~180-168 Ma) according to Posidonia-type bivalves from Dobšiná.…”

Section: Mélange Sources As Indicators Of the Meliatic Triassic-jurasmentioning

confidence: 57%

“…The metamorphic overprinting grade of the Meliatic subduction-related accretionary wedge is mostly in the MP greenschist-to HP blueschist facies (see also [8,29,[70][71][72][73][74][75] and Figures S1, S2, S4; Table S1). The unsubducted to shallowly subducted parts have maximum anchimetamorphic overprinting [1,2,4,8,30,64,76,77], with the exception of some Bretka N-MORB fragments metamorphosed in the amphibolite facies (BRT-1, 2, 8 samples; Figures S1 and S2; Table S1). This may indicate the metamorphic sole position of this part of the Jaklovce Unit during the NW-ward thrusting of the ophiolite sheets over the Meliata Unit flysch and the exhumed Bôrka Unit fragments ( Figure 21).…”

Section: Middle To Late Jurassic Subduction Basin Closure and Accretmentioning

confidence: 99%

“…The Meliatic blocks and fragments of different (km-cm) size have major lithology and metamorphic overprinting grade differences and these currently remain subdivided into (i) a subducted part, metamorphosed at HP-MP/LT conditions and termed the Bôrka Nappe [8,29,30,[74][75][76], and (ii) unsubducted fragments with only very low-grade metamorphic overprinting, termed the Meliata Unit s.s. according to the type locality at the Meliata village [1,2,4,8,30,64,76,77].…”

Section: Introductionmentioning

confidence: 99%

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Origin and Age Determination of the Neotethys Meliata Basin Ophiolite Fragments in the Late Jurassic–Early Cretaceous Accretionary Wedge Mélange (Inner Western Carpathians, Slovakia)

Putiš

Soták

et al. 2019

Minerals

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This study reports the Neotethyan Meliata Basin ophiolite fragments in the Late Jurassic-Early Cretaceous accretionary wedge mélange in the southern part of the Inner Western Carpathians (IWC). Here we present new lithostratigraphical, petrographical, geochemical, and geochronological data obtained from the mélange blocks used to reconstruct the Meliaticum paleotectonic zones in a tentative evolutionary model of this accretionary wedge. The Dobšiná mélange block continental margin carbonatic and siliciclastic sediments have calc-alkaline basalt intercalations. The basalt Concordia age dated to 245.5 ± 3.3 Ma by U-Pb SIMS on zircon most likely indicates the pre-oceanic advanced early Middle Triassic continental rifting stage. The evolving marginal oceanic crust is composed of Middle to Upper Triassic cherty shales to radiolarites. The detrital zircon U-Pb SIMS Concordia ages of 247 ± 4 Ma and 243 ± 4 Ma from a cherty shale, and the xenocryst zircon population Concordia age of 266 ± 3 Ma from a 0.5 m thick "normal" mid-ocean ridge (N-MOR) basalt layer in this cherty shale reveal the connection of the oceanic basin to the adjacent rifting continental margin. The chertified reddish limestone transition to radiolarite indicates syn-rift basin deepening. Upwards, regular alternating N-MOR basalts and radiolarites are often disturbed by peperite breccia horizons. The Nd isotope values of these basalts (εNd 240 = 7-8) are consistent with their chondrite normalized rare earth element (REE) patterns and indicate a depleted mantle source. The Triassic ophiolitic suite also comprises rare ocean island (OI) basalts (εNd 240 = 5) and serpentinized subduction unrelated peridotites. The Middle to Late Jurassic shortening and southward intra-oceanic and continental margin subduction at approximately 170-150 Ma enhanced the formation of the trench-like Jurassic flysch succession which preceded the closure of the Meliata Basin. The flysch sediments form a mélange matrix of olistolithic unsubducted, obducted, and MP-HP/LT metamorphosed exhumed blocks of the Triassic to Lower Jurassic successions. Blocks of peridotites, rodingites, blueschists, greenschists, rare amphibolites, deep-water shaly sediments and shallow-to deep-water carbonates are typical members of the mélange. The Meliatic accretionary wedge mélange nappe outliers were incorporated in the IWC orogenic wedge in the late Early Cretaceous according to metamorphic rutile U-Pb SIMS ages of 100 ± 10 Ma determined from a Jaklovce metabasalt.

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Section: Mélange Sources As Indicators Of the Meliatic Triassic-jurasmentioning

confidence: 57%

Section: Middle To Late Jurassic Subduction Basin Closure and Accretmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin and Age Determination of the Neotethys Meliata Basin Ophiolite Fragments in the Late Jurassic–Early Cretaceous Accretionary Wedge Mélange (Inner Western Carpathians, Slovakia)

Putiš

Soták

et al. 2019

Minerals

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“…Moreover, Jablonský et al (2001) re ported the pres ence of spinel detri tus in the Valangian-Hauterivian strata of the Fatric Zliechov Suc ces sion. Plašienka et al (2018) sug gested the Urgonian lime stone source from a Meliatic ephem eral ba sin. This model may con tra dict with the Meliatic nappe struc ture for ma tion at that time (Putiš et al, 2014), and also miss ing such kind of facies in the Gosau-type sed i ments over ly ing the Gemeric and Silicic units (e.g., Hovorka et al, 1990).…”

Section: Discussion -Constraining the Infratatric Evolutionary Stagesmentioning

confidence: 99%

Cretaceous and Eocene tectono-thermal events determined in the Inner Western Carpathians orogenic front Infratatricum

Putiš

Danišík

Siman

et al. 2019

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This pa per re-as sesses the tectono-ther mal evo lu tion of the fron tal Infratatricum part of the In ner West ern Carpathians orogen based on new geo log i cal-pet ro log i cal and zir con fis sion track (ZFT) data and pub lished 40 Ar-39 Ar and K-Ar data. The study area is in the Považský Inovec Mts. in West ern Slovakia, where the Infratatric Inovec Nappe com prises a micaschist-gneiss base ment and Up per Car bon if er ous-Lower Cre ta ceous cover with the Ju ras sic-Lower Cre ta ceous Humienec Suc ces sion; this lat ter is re con structed from olistoliths in the Horné Belice Suc ces sion Up per Cre ta ceous flysch. The Infratatric Inovec Nappe pos te rior part is thrust over its fron tal Humienec tec tonic Slice with infolded Up per Cre ta ceous sed i ments. This nappe ex hib its very low-tem per a ture tectono-ther mal over print ing, and this is doc u mented by elec tron probe microanalysis of meta mor phic phases and P-T es ti mates. The late Early Cre ta ceous age of this D1 stage event at approx i mately 115-95 Ma is re corded by 114 ±2 and 106 ±4 Ma phengitic white mica 40 Ar-39 Ar ages from a Lower Cre ta ceous cherty slate, and by 101 ±3 Ma 40 Ar-39 Ar age and 102 ±4 Ma ZFT age from Perm ian meta-sand stone. The Inovec Nappe was thus de rived from an Albian-Early Cenomanian accretionary wedge. The hemipelagic Up per Turonian to Lower Santonian red marls and up ward syn-orogenic Up per Santonian to Maastrichtian flysch were de pos ited on the fron tal at ten u ated part of the Inovec Nappe-type base ment in the in ferred Pieninic-Váhic (~South-Penninic) zone. This flysch con tains olistolithic to clastogeneous meta mor phosed ma te rial, in clud ing the Lower Cre ta ceous slates, sup plied from the pos te rior part of the Inovec Nappe. The 40 Ar-39 Ar age of 86 ±2 Ma from this nappes' Perm ian meta-sand stone is con sis tent with D2 thrust ing at ap prox i mately 95-85 Ma and Horné Belice fore land flysch ba sin sup ply in the D3 stage at ~85-65 Ma. The Inovec Nappe fron tal Humienec tec tonic Slice with infolded Up per Cre ta ceous sed i ments sug gests for ma tion of a Paleocene-Eocene accretionary wedge at ap prox i mately 65-40 Ma in the D4 stage. This event is con strained by 40 Ar-39 Ar age of 48 ±2 Ma from the Tatricum hang ing wall blastomylonites and whole-rock K-Ar age of 46 ±3 Ma from a Perm ian ba salt olistolith in the footwall Infratatricum Horné Belice flysch. The Infratatricum fi nally be came part of an Eocene accretionary wedge north of the Hrádok-Zlatníky thrust-fault, and re heat ing and ex hu ma tion cool ing is doc u mented by 57-37 Ma ZFT ages. Al though the Infratatricum ex hib its Late Cre ta ceous and Eocene tectono-ther mal im prints, it is a rem nant of the Early Cre ta ceous structure at the In ner West ern Carpathian front. This im poses the Infratatricum as a dis tal con ti nen tal mar gin of the Penninicum.

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“…The original idea resulting from the geochemistry of the PKB metabasite pebbles points to their different metamorphic history when compared to the Meliatic blueschists [105][106][107]. Some investigations suggest a markedly northward extension of the Meliata Ocean [108], and the blueschist-facies pebbles in the Cretaceous flysch formations of the PKB exhibit similar characteristics to the blueschist-facies rocks in the Meliata Unit, so these may be considered to have a Meliatic provenance [109,110]. Besides the Meliatic pebbles, the Albian-Cenomanian flysch sediments also contain pebbles from another south source-the Gemer Unit [111,112].…”

Section: Discussionmentioning

confidence: 99%

Is Cr-Spinel Geochemistry Enough for Solving the Provenance Dilemma? Case Study from the Palaeogene Sandstones of the Western Carpathians (Eastern Slovakia)

2018

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The provenance of the Proč and Strihovce sandstones is crucial for understanding the relationship between the Pieniny Klippen (PKB) and Flysch (FB) belts in the easternmost part of the Western Carpathian realm. Detrital Cr-spinels in these tectonic units were assertively interpreted as sourced from the southern sources representing the Meliata mélange. In this study, we use the geochemistry of detrital chromian spinels to identify the mafic and ultramafic source of the sediments and to compare them each other. Simultaneously, we compare their chemical compositions with those from the different Western Carpathian geological units, which could feed the Proč and Krynica basins during the Paleogene, where the Proč and Strihovce formations (fms), respectively, were deposited. Chromian spinels from the Proč and Strihovce fms exhibit similar geochemical characteristics (Cr# = 0.44–0.88 and 0.29–0.89, Mg# = 0.17–0.68 and 0.2–0.72, TiO2 = 0.0–3.67 and 0.01–2.08 wt.%, respectively). The spinels show both supra-subduction zone (SSZ) peridotite signatures and volcanic origin. Whereas volcanic spinels from the Proč Formation (Fm.) were formed under an ocean island basalt (OIB) and back-arc basin basalt (BABB) geodynamic setting, those from the Strihovce Fm. suggest a predominantly mid-ocean ridge basalt (MORB) origin. To avoid mistakes in the provenance interpretations, the data from garnet geochemistry of both formations is supplied. The analysed Cr-spinels do not absolutely overlap with spinels reported from the Meliata Unit, and their composition indicates at least two independent sources.

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Meliatic blueschists and their detritus in Cretaceous sediments: new data constraining tectonic evolution of the West Carpathians

Cited by 23 publications

References 72 publications

Origin and Age Determination of the Neotethys Meliata Basin Ophiolite Fragments in the Late Jurassic–Early Cretaceous Accretionary Wedge Mélange (Inner Western Carpathians, Slovakia)

Origin and Age Determination of the Neotethys Meliata Basin Ophiolite Fragments in the Late Jurassic–Early Cretaceous Accretionary Wedge Mélange (Inner Western Carpathians, Slovakia)

Cretaceous and Eocene tectono-thermal events determined in the Inner Western Carpathians orogenic front Infratatricum

Is Cr-Spinel Geochemistry Enough for Solving the Provenance Dilemma? Case Study from the Palaeogene Sandstones of the Western Carpathians (Eastern Slovakia)

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