Variscan Basement of the Western Alps: the External Crystalline Massifs

Ménot, René-Pierre; Raumer, Jürgen F. von; Bogdanoff, S.; Vivier, Gérard Du

doi:10.1007/978-3-642-84915-2_35

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…Currently, the 14 sheared and displaced sedimentary units in Switzerland's Helvetic nappe system form sedimentary nappes. The crystalline basement, is deformed some portion by the external massif or that and, including autochthonous cover of sediments [13].…”

Section: Natural Case Studiesmentioning

confidence: 99%

WITHDRAWN: The Tectonic Inversion Prediction in Fold-and-thrust Belts by Using Numerical Modeling

Zaidi,

Ahsan

2024

Preprint

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This research investigates to tectonic inversion in rifted continental margins, specifically focusing on the interaction between foreland sediment deposits and fold-and-thrust belts during orogeny. Using numerical modeling with ANSYS software and a Maxwell-type viscoelastic rheology, the study explores positive inversion in petroleum basins, revealing insights into the evolution of inverted basins. The research emphasizes the role of pre-existing extensional fault systems in controlling thrust faults, delving into the reactivation of faults and uplift of the hanging wall during tectonic compression. The study highlights diverse structural patterns associated with tectonic inversion in sub-thrust regions of fold-and-thrust belts, including anticlines, back-thrusts, fault propagation folds, pop-ups, and an inversion-related fracture pattern. Results demonstrate the critical influence of rheological properties in fault reactivation and deformational styles during tectonic inversion. Comparisons with natural case studies, like the Helvetic nappes in Switzerland, validate the predictive capability of numerical models for tectonic inversion structures in different geological settings, including the Kohat-Potwar Fold and Thrust Belt in Pakistan. The importance of understanding the interplay between geological structures and rheological properties for accurately predicting the evolution of inverted basins. The deeply study of tectonic inversion are extending to optimizing exploration efforts and interpreting structural complexities in petroleum exploration, providing valuable insights for reservoir prediction and fold-and-thrust belt structural evolution.

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Section: Natural Case Studiesmentioning

confidence: 99%

WITHDRAWN: The Tectonic Inversion Prediction in Fold-and-thrust Belts by Using Numerical Modeling

Zaidi,

Ahsan

2024

Preprint

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“…2) is composed of a flysch series, with rare intercalations of basic layers [31]. Similar metasedimentary formations are observed in the Aiguilles Rouges (St Gervais schists) in the Argentera (Valetta unit) [35] and in the Barrandian domain of the Bohemian massif [12]. The absolute age of these sediments is unknown, but a Late Neoproterozoic to Early Palaeozoic age is commonly proposed [12,31].…”

Section: The Western Domainmentioning

confidence: 97%

“…1. a: the Paleozoic basement in Central Europe and the External Crystalline Massifs -AA: Aar; AG: Argentera; AR: Aiguilles Rouges; BE: Belledonne; GO: Gotthard; GR: Grandes Rousses; MB: Mont Blanc; OI: Oisans (modified after [47]); b: simplified geological maps of the ECMs (modified after [35]). Fig.…”

Section: The Central Domainmentioning

confidence: 99%

Paleozoic evolution of the External Crystalline Massifs of the Western Alps

Guillot

Ménot

2009

Comptes Rendus. Géoscience

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The External Crystalline Massifs (ECMs) of the Alps record, during the Paleozoic, the progressive closure of oceanic domains between Gondwana, Armorica and Avalonia in three contrasting tectonic domains. The eastern one shows the Early Devonian closure of the Central-European Ocean between Armorica and Gondwana along a northwest dipping subduction zone. The western domain is marked by Lower Ordovician rifting followed by Mid-Devonian obduction of the back-arc Chamrousse ophiolite. The central domain underwent Late Devonian to Dinantian extension in a back arc setting associated with southeast dipping subduction of the Saxo-Thuringian Ocean. Based on tectonostratigraphic correlations, we propose that the western domain shows an affinity to the Barrandian domain while the eastern and central domains correspond to the north-eastward extension of the Moldanubian zone, to the south of the present-day Bohemian Massif. From Mid-Carboniferous to Permian, the eastern and central domains of the ECMs, including the internal parts of the Maures Massif, Sardinia and Corsica were stretched towards the south-west along the ca. 1500 km long dextral ECMs shear zone preceding the opening of the Palaeo-Tethys ocean.

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“…The Carnic Alps came under the infl uence of subsidence during crustal extension (Schönlaub, 1997), and the formation of Visean to Serpukhovian fl ysch in the Austroalpine domain (Schönlaub and Heinisch, 1993;Neubauer and Handler, 1999) is the fi ngerprint of the initiating Variscan orogenic events. In the external domain (Ménot and Paquette, 1993;Ménot et al, 1994;, Devonian volcanic-sedimentary deposits indicate an extensional environment accompanied by granitoid intrusions in the global context of subduction/compression, in which the former, more externally located domain of the Cambrian ultramafi c Chamrousse complex has been tectonically emplaced above the more internal metasedimentary series. The fi rst formation of fl ysch deposits marks the Variscan orogenic events, and the Variscan fl yschoid series usually follows an episode of pelagic deposits characterized by condensed red nodular limestones and black radiolarian cherts (lydite).…”

Section: Time Of the Variscan Collisionmentioning

confidence: 99%

Pre-Mesozoic Alpine basements—Their place in the European Paleozoic framework

Raumer

Bussy

Schaltegger

et al. 2012

Geological Society of America Bulletin

223

160

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Prior to their Alpine overprinting, most of the pre-Mesozoic basement areas in Alpine orogenic structures shared a complex evolution, starting with Neoproterozoic sediments that are thought to have received detrital input from both West and East Gondwanan cratonic sources. A subsequent Neoproterozoic-Cambrian active margin setting at the Gondwana margin was followed by a Cambrian-Ordovician rifting period, including an Ordovician cordillera-like active margin setting. During the Late Ordovician and Silurian periods, the future Alpine domains recorded crustal extension along the Gondwana margin, announcing the future opening of the Paleotethys oceanic domain. Most areas then underwent Variscan orogenic events, including continental subduction and collisions with Avalonian-type basement areas along Laurussia and the juxtaposition and the duplication of terrane assemblages during strike slip, accompanied by contemporaneous crustal shortening and the subduction of Paleotethys under Laurussia. Thereafter, the fi nal Pangea assemblage underwent Triassic and Jurassic extension, followed by Tertiary shortening, and leading to the buildup of the Alpine mountain chain. Recent plate-tectonic reconstructions place the Alpine domains in their supposed initial Cambrian-Ordovician positions in the eastern part of the Gondwana margin, where a stronger interference with the Chinese blocks is proposed, at least from the Ordo vician onward. For the Visean time of the Variscan continental collision, the distinction of the former tectonic lower-plate situation is traceable but becomes blurred through the subsequent oblique subduction of Paleo tethys under Laurussia accompanied by large-scale strike slip. Since the Pennsylvanian, this global collisional scenario has been replaced by subsequent and ongoing shortening and strike slip under rising geothermal conditions, and all of this occurred before all these puzzle elements underwent the complex Alpine reorganization.

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Variscan Basement of the Western Alps: the External Crystalline Massifs

Cited by 8 publications

References 17 publications

WITHDRAWN: The Tectonic Inversion Prediction in Fold-and-thrust Belts by Using Numerical Modeling

WITHDRAWN: The Tectonic Inversion Prediction in Fold-and-thrust Belts by Using Numerical Modeling

Paleozoic evolution of the External Crystalline Massifs of the Western Alps

Pre-Mesozoic Alpine basements—Their place in the European Paleozoic framework

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