Relevant bibliographies by topics / Variscan orogeny

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Academic literature on the topic 'Variscan orogeny'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Variscan orogeny"

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García-Alcalde, Jenaro L. "En el extremo de la Zona Cantábrica (Artículo de divulgación basado en una conferencia dictada por el autor, en Arbejal, Palencia, a profesores de Enseñanza Media) At the Cantabrian zone edge (Dissemination article based on a lecture given by the author, in Arbejal, Palencia, to Secondary Education teachers)." Trabajos de Geología 36, no. 36 (September 12, 2018): 163. http://dx.doi.org/10.17811/tdg.36.2016.163-190.

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Resumen: Se describe a grandes rasgos la evolución paleogeográfica y estructural y las condiciones tectonosedimentarias de la Zona Cantábrica, durante las etapas Variscas preorogénica y sinorogénica, con foco principal en la Provincia del Pisuerga-Carrión, y se detalla algo más la estratigrafía del Devónico de la región y las huellas que dejaron en las rocas de esta edad diferentes eventos geo-biológicos con elevado interés como herramientas cronoestratigráficas.Palabras clave: paleogeografía, evolución tectonosedimentaria, Zona Cantábrica, provincia del Pisuerga-Carrión, orogenia Varisca, Silúrico-Carbonífero.Abstract: An overall description of the Variscan paleogeography and tectonosedimentary evolution of the Pisuerga-Carrion Province (eastern Cantabrian Zone, N Spain) is given. The Devonian stratigraphy of that province and the major geologic and paleontological events recorded in these successions are briefly discussed, emphasizing their significance as chronostratigraphic tools.Keywords: paleogeography, tectonosedimentary evolution, Cantabrian Zone, Pisuerga-Carrion province, Variscan orogeny, Silurian-Carboniferous.
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Dill, Harald. "A Model of Metallogenesis throughout Variscan Orogeny and Denudation of the Variscan Orogen in Southern Germany and Adjoining Areas." Zeitschrift der Deutschen Geologischen Gesellschaft 141, no. 1 (January 1, 1990): 129–38. http://dx.doi.org/10.1127/zdgg/141/1990/129.

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VACEK, FRANTIŠEK, and JIŘÍ ŽÁK. "A lifetime of the Variscan orogenic plateau from uplift to collapse as recorded by the Prague Basin, Bohemian Massif." Geological Magazine 156, no. 3 (November 10, 2017): 485–509. http://dx.doi.org/10.1017/s0016756817000875.

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AbstractThe Ordovician to Middle Devonian Prague Basin, Bohemian Massif, represents the shallowest crust of the Variscan orogen corresponding toc.1–4 km palaeodepth. The basin was inverted and multiply deformed during the Late Devonian to early Carboniferous Variscan orogeny, and its structural inventory provides an intriguing record of complex geodynamic processes that led to growth and collapse of a Tibetan-type orogenic plateau. The northeastern part of the Prague Basin is a simple syncline cross-cut by reverse/thrust faults and represents a doubly vergent compressional fan accommodatingc.10–19 % ~NW–SE shortening, only minor syncline axis-parallel extension and significant crustal thickening. The compressional structures were locally overprinted by vertical shortening, kinematically compatible with ductile normal shear zones that exhumed deep crust in the orogen's interior atc. 346–337 Ma. On a larger scale, the deformation history of the Prague Syncline is consistent with building significant palaeoelevation during Variscan plate convergence. Based on a synthesis of finite deformation parameters observed across the upper crust in the centre of the Bohemian Massif, we argue for a differentiated within-plateau palaeotopography consisting of domains of local thickening alternating with topographic depressions over lateral extrusion zones. The plateau growth, involving such complex three-dimensional internal deformations, was terminated by its collapse driven by multiple interlinked processes including gravity, voluminous magma emplacement and thermal softening in the hinterland, and far-field plate-boundary forces resulting from the relative dextral motion of Gondwana and Laurussia.
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Ptáček, Jiří, Radomír Grygar, Petr Koníček, and Petr Waclawik. "The impact of Outer Western Carpathian nappe tectonics on the recent stress-strain state in the Upper Silesian Coal Basin (Moravosilesian Zone, Bohemian Massif)." Geologica Carpathica 63, no. 1 (February 1, 2012): 3–11. http://dx.doi.org/10.2478/v10096-012-0002-x.

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The impact of Outer Western Carpathian nappe tectonics on the recent stress-strain state in the Upper Silesian Coal Basin (Moravosilesian Zone, Bohemian Massif) The Upper Silesian Coal Basin (USCB) represents a typical foreland basin developed during the Variscan orogenic phase of the Late Carboniferous. Later, during the Alpine orogeny the Outer Western Carpathian nappes were thrust over the post-Variscan foreland, to which the USCB belongs. Due to this complex tectonic history, redistribution of stress fields occurred in the post-Variscan basement. Furthermore, post-Variscan denudation processes probably also contributed to recent stress regimes. Nevertheless, the impact of the West Carpathian orogeny can be regarded as the most significant influence. The in-situ measurement of recent stress fields in deposits of the Karviná Formation of the USCB and structural analysis of the Czech part of the USCB, has focused on verification of the structure and stress interference of the Carpathian nappes and post-Variscan foreland basement. In the southernmost part of the Karviná Subbasin, the easternmost domain of the USCB, situated in the apical zone of the Variscan accretionary wedge, hydrofracturing and overcoring stress measurements have been recorded in coal seams from selected coal mines. The data have been supplemented by interpretation of focal mechanism solutions of mine induced seismic events. Measurements of recent in-situ stress regimes in the Karviná Formation of the USCB indicate a dominant generally NW-SE orientation of the maximum horizontal compression stress. The results demonstrate that the stress-strain regime in the Karviná Formation in the Variscan Upper Carboniferous basement is significantly influenced by the stress field along the Outer Western Carpathian nappes front. Besides improving our understanding of recent regional stress fields within an area of mutual structural-tectonic interference by both the Variscan and Alpine orogenies, the measured data may contribute to more optimal and safer mining activities in the coal basin.
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Balintoni, Ioan, Constantin Balica, Monica Cliveţi, Li-Qiu Li, Horst Hann, Fukun Chen, and Volker Schuller. "The emplacement age of the Muntele Mare Variscan granite (Apuseni Mountains, Romania)." Geologica Carpathica 60, no. 6 (December 1, 2009): 495–504. http://dx.doi.org/10.2478/v10096-009-0036-x.

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The emplacement age of the Muntele Mare Variscan granite (Apuseni Mountains, Romania)Like the Alps and Western Carpathians, the Apuseni Mountains represent a fragment of the Variscan orogen involved in the Alpine crustal shortenings. Thus the more extensive Alpine tectonic unit in the Apuseni Mountains, the Bihor Autochthonous Unit is overlain by several nappe systems. During the Variscan orogeny, the Bihor Unit was a part of the Someş terrane involved as the upper plate in subduction, continental collision and finally in the orogen collapse and exhumation. The Variscan thermotectonic events were marked in the future Bihor Unit by the large Muntele Mare granitoid intrusion, an S-type anatectic body. Zircon U-Pb laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) dating yielded a weighted mean age of 290.9 ± 3.0 Ma and a concordia age of 291.1 ± 1.1 Ma. U-Pb isotope dilution zircon analyses yielded a lower intercept crystallization age of 296.6 + 5.7/-6.2 Ma. These two ages coincide in the error limits. Thus, the Muntele Mare granitoid pluton is a sign of the last stage in the Variscan history of the Apuseni Mountains. Many zircon grains show inheritance and/or Pb loss, typical for anatectic granitoid, overprinted by later thermotectonic events.
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Schulmann, Karel. "Mechanics of Variscan Orogeny: A modern view on orogenic research." Comptes Rendus Geoscience 341, no. 2-3 (February 2009): 97–102. http://dx.doi.org/10.1016/j.crte.2009.01.003.

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Fernández, F. J., and S. Llana-Fúnez. "Deformación asociada a la falla de Valdoviño (Noroeste del Macizo Ibérico) Deformation related to the Valdoviño fault (Northwest Iberian Massif)." Trabajos de Geología 36, no. 36 (September 12, 2018): 95. http://dx.doi.org/10.17811/tdg.36.2016.95-118.

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Resumen: La sección costera de la falla de Valdoviño expone rocas de falla deformadas en las proximidades de la base de la zona sismogénica de la corteza Ibérica Varisca, en la que estructuras frágiles discretas afectan una zona de deformación predominantemente dúctil. El núcleo de la falla contiene rocas ultramáficas, rocas máficas con granate, anfibolitas, neises cuarzo-feldespáticos y metavulcanitas básicas entre las facies deformadas del granitoide Varisco de A Espenuca. Este artículo describe la deformación y microestructuras relacionadas con la falla desarrolladas en el granitoides. La composición y características tectonometamórficas del resto de rocas presentes en el núcleo de la falla sugieren que las estructuras asociadas a la falla se superpusieron a fábricas tectónicas previas, similares a las que presentan las rocas de los complejos alóctonos del NO del Macizo Ibérico.Palabras clave: microestructura, rocas de falla, corteza continental, EBSD, Orógeno Varisco.Abstract: The coastal section across the Valdoviño fault exposes fault-related rocks deformed at the base of the seismogenic zone of the Iberian Variscan crust. Discrete brittle structures are superimposed over previous predominant ductile deformation fabrics in most rocks. The core of the fault contains ultramafic rocks, garnet-bearing mafic rocks, amphibolites, quartzo-feldspathic gneisses and basic metavulcanites, in between the deformed facies of the A Espenuca Variscan granitoid. We show the deformation and microstructures related to the fault developed in the Variscan granitoid. The composition and tectonometamorphic features of the rest of the related rocks at the core of the fault suggest that deformation structures are superposed onto earlier tectonic fabrics, similar to those present in the rocks of the allochthonous complexes of the NW Iberian Massif.Keywords: microstructure, fault-related rocks, continental crust, SEM-EBSD, Variscan Orogeny.
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Okay, Aral I., and Gültekin Topuz. "Variscan orogeny in the Black Sea region." International Journal of Earth Sciences 106, no. 2 (September 22, 2016): 569–92. http://dx.doi.org/10.1007/s00531-016-1395-z.

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Pastor-Galán, Daniel, Gabriel Gutiérrez-Alonso, and Arlo B. Weil. "The enigmatic curvature of Central Iberia and its puzzling kinematics." Solid Earth 11, no. 4 (July 8, 2020): 1247–73. http://dx.doi.org/10.5194/se-11-1247-2020.

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Abstract. The collision between Gondwana and Laurussia that formed the latest supercontinent, Pangea, occurred during Devonian to early Permian times and resulted in a large-scale orogeny that today transects Europe, northwest Africa, and eastern North America. This orogen is characterized by an “S” shaped corrugated geometry in Iberia. The northern curve of the corrugation is the well-known and studied Cantabrian (or Ibero–Armorican) Orocline and is convex to the east and towards the hinterland. Largely ignored for decades, the geometry and kinematics of the southern curvature, known as the Central Iberian curve, are still ambiguous and hotly debated. Despite the paucity of data, the enigmatic Central Iberian curvature has inspired a variety of kinematic models that attempt to explain its formation but with little consensus. This paper presents the advances and milestones in our understanding of the geometry and kinematics of the Central Iberian curve from the last decade with particular attention to structural and paleomagnetic studies. When combined, the currently available datasets suggest that the Central Iberian curve did not undergo regional differential vertical-axis rotations during or after the latest stages of the Variscan orogeny and did not form as the consequence of a single process. Instead, its core is likely a primary curve (i.e., inherited from previous physiographic features of the Iberian crust), whereas the curvature in areas outside the core is dominated by folding interference from the Variscan orogeny or more recent Cenozoic (Alpine) tectonic events.
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Van Baelen, Hervé, and Manuel Sintubin. "Kinematic consequences of an angular unconformity in simple shear: an example from the southern border of the Lower Palaeozoic Rocroi inlier (Naux, France)." Bulletin de la Société Géologique de France 179, no. 1 (January 1, 2008): 73–87. http://dx.doi.org/10.2113/gssgfbull.179.1.73.

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AbstractThe presence of an angular unconformity in combination with complex structures in the basement, lacking in the cover, is commonly seen as an indication for an orogenic event pre-dating the unconformity. The recognition of such an older orogenic event becomes, however, less evident in areas where both cover and basement were deformed together during an orogen post-dating the angular unconformity.The validity of this common interpretation has been evaluated at the southern border of the Lower Palaeozoic Rocroi basement inlier (Naux, northern France), where the basement-cover interface is very well exposed. This basement-cover interface, showing an angular unconformity, has classically been interpreted as evidence for an early Palaeozoic tectonometamorphic event, called the Ardennian orogeny, though only one penetrative cleavage, co-genetic with the structures present in both cover and basement, can be observed.A detailed geometrical study shows, however, that the presence of a tilted basement, involving the angular unconformity, provokes a rheological heterogeneity that causes a contrasting response of basement and cover with respect to the Variscan shortening. While Variscan progressive deformation gave rise to a rather regular cleavage refraction pattern in the subhorizontal multilayer cover sequence, a complex deformation, expressed by non-cylindrical folds, boudinage and shearing developed in the basement. The basement-cover interface itself played no rheological role, but has been passively sheared and folded as a consequence of the deformation of the basement. This study proves that the deformed basement-cover interface, allowing to link deformation in basement and cover, is a necessary tool to properly interpret complex deformation in the basement. With respect to the regional geodynamic evolution of the northern parts of the Central European Variscides, our kinematic model indeed demonstrates that this classical outcrop area bears no evidence for an early Palaeozoic orogenic event, and that the angular unconformity reflects the late Silurian – early Devonian onset of the Ardenne-Eifel basin development, rather than a middle Ordovician Ardennian orogeny.
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Dissertations / Theses on the topic "Variscan orogeny"

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Kashubin, Artem. "Seismic Studies of Paleozoic Orogens in SW Iberia and the Middle Urals." Doctoral thesis, Uppsala universitet, Geofysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9405.

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Controlled source seismic methods were employed in this study to investigate the reflectivity and velocity structure of two Hercynian orogens – the Uralides and Variscides. Conventional common depth point (CDP) sections from five reflection seismic campaigns and a velocity model obtained from tomographic inversion of wide-angle observations were the main datasets studied from the Middle Urals. These were complemented with the near-vertical seismic sections and velocity models from the Southern Urals. In the Variscides, conventional CDP processing, along with non-standard processing and synthetic data modeling, were used to obtain and interpret reflection seismic images of the Southwestern Iberian crust. Although, the Uralian and Variscan belts were formed in Late Paleozoic time in apparently similar plate collisional settings, a comparison of the seismic results show that the crust of these two orogens looks quite different at depth. In the Urals, collision of Baltica with Asian terranes (Siberia and Kazakhstan) resulted in a highly diversely reflective crust of 40-45 km thickness. The axial zone of the orogen is characterized by a high velocity crustal root of diffuse reflectivity and an imbricated Moho, with a crustal thickness reaching 55-60 km. The Moho discontinuity is marked by a sharp decrease in reflectivity and is well imaged in most locations except in the crustal root zone. The Southwestern Iberian Variscan crust is 30-35 km thick and is characterized by a highly reflective two-layered structure that resulted from collision of Luarussia and Gondwana, including terranes in-between them. This type of crustal structure is very similar to those imaged in other regions of the Variscan belt in the Europe. The Moho discontinuity is flat and appears to be the deepest reflection. This thesis compares the deep structure of the two orogens and interprets mountain building processes related to late Paleozoic plate movements.
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Basile, Caterina. "Interacção fracturação/dobramento na deformação de sequências turbiditícas: o exemplo do carbónico da zona sul portuguesa." Master's thesis, Universidade de Évora, 2011. http://hdl.handle.net/10174/14739.

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Os dados obtidos recentemente ao longo do litoral a norte da praia de Almograve permitiram um melhor conhecimento da primeira e mais importante fase de deformação varisca regional que apresenta uma orientação geral NW-SE. Os estudos anteriores mostravam que esta primeira fase tectónica foi caracterizada por um evento precoce (D1a) caracterizado por cisalhamentos conjugados, tinha estado activo um episódio de dobramento generalizado (D1b). Este trabalho mostra que estas dobras foram deslocadas por cisalhamentos conjugados subverticais (D1c): direitos NNE-SSW e esquerdos E-W. Os cisalhamentos NNE-SSW desempenharam posteriormente um papel fundamental durante a deformação intracontinental tardi-varisca (D2); nessa altura eles foram reactivados como desligamentos esquerdos devido à rotação de blocos num mecanismo do tipo dominó induzido pela cinemática direita associada a grandes cisalhamentos litosféricos E-W; ABSTRACT:New data along the cost north of the Almograve beach allow us to detail the tectonic evolution of the first and main regional variscan phase (D1) with a pervasive NW-SE trend. Previous studies show that this tectonic phase was characterized by an early event inducing conjugate shear zones (D1a) was followed by a generalized mesoscopic folding (D1b). This work shows that these folds where displaced by conjugate sub-vertical shears (D1c): dextral NNE-SSW and sinistral E-W. The NNE-SSW wrench faults played a major role during the intracontinental tardi-variscan deformation (D2); at that time they were reworked as sinistral shears due to the rotation of the blocks in a book-shelf mechanism induced by the dextral kinematics along the lithospheric E-W shears.
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Moe, Aung. "Structural development of a volcanic sequence of the Lahn area during the variscan orogeny in the Rhenohercynian belt (Germany)." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961466162.

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Aguilar, Gil Carmen María. "P-T­-t-d constraints on the Late Variscan evolution of the Eastern Pyrenees." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/128622.

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Structural, petrological, microstructural and geochronological studies were combined with pseudosection modeling in the Roc de Frausa Massif (Eastern Pyrenees). The massif is constituted by Upper Proterozoic–Early Cambrian rocks and represents a mid crustal section intruded by igneous rocks. The aim is to compare the thermal evolution of different crustal levels in a single orogenic event. The rocks constituting the massif were part of the northern margin of Gondwana and were involved in the Variscan orogeny when Gondwana collided with Laurentia-Baltica. Two main Variscan deformation events are distinguished. D1 is marked by tight to isoclinal small-scale folds and a sub-horizontal foliation. D2 structures are tight upright folds facing to the NW with steep NE–SW axial planes. In the high-grade metamorphic domains it transposes S1 foliation by a sub-vertical S2 foliation. D3 structures are characterized by NW–SE folds compatible with steep dextral shear zones that retrograde the pre-Variscan rocks and the Variscan intrusives to greenschist facies. N and S of the studied area F3 folds involve Mesozoic rocks, and therefore it can be attributed to the Alpine orogeny. In the micaschists of the Upper crustal levels, andalusite porphyroblasts with S1 inclusion trails and sillimanite in S1 pressure shadows indicate heating from 580 °C to 640 °C. Cordierite includes the former minerals and does not exhibit pressure shadows pointing to isothermal decompression from 3.4 to 2.6 kbar. A calc-alkaline granitoid intruded on top of this level interkinematically between D1 and D2 (314–311 Ma). Intermediate crustal levels are dominated by schists with sillimanite−biotite−muscovite in the S1 fabric overgrown by cordierite and K-feldspar with no pressure shadows. These assemblages point to decompression from 5 to 3 kbar at 640−660 °C. A gabbro-diorite stock intruded in this level coeval with the D2 in two magmatic pulses (312 and 307 Ma). In the inner aureole four types of migmatites have been characterized, with different textures, mineral assemblages, mineral chemistry and whole-rock compositions. The biotite−sillimanite−K-feldspar−garnet assemblage together with garnet zoning is compatible with heating within the S1 fabric at peak-pressure of 7 kbar and 730 °C. F2 folds with subvertical melt-filled S2 foliation were overgrown by cordierite indicating mainly syn-D2 decompression to 4.5 kbar. The different whole-rock and mineral compositions and the preservation of the mineral assemblages of migmatitic rocks can be explained by different episodes of melt-loss and fluid infiltration in the metasediments at 790 °C and 5.5 kbar and incorporation of the fluids into the melt. The fluids would be released by the crystallizing gabbro-diorite. Lower crustal levels are dominated by fold-structured migmatites occurred in the interval 320–315 Ma. They present a biotite−cordierite composite S1-S2 biotite-bearing fabric with relic garnet embedded in plagioclase, thus precluding deciphering the early metamorphic evolution. Cordierite overgrowing both S1 and S2 fabric points to late equilibration at 3 kbar and 700 °C. The early metamorphic history associated with the S1 fabric is interpreted as a result of lower crustal horizontal flow and could be related to moderate crustal thickening. D2 event is characterized by decompression associated to highly heterogeneous exhumation of the metamorphic complex during the last stages of the Variscan evolution.
Se ha realizado un estudio estructural, petrológico, geoquímico, geocronológico y de modelización térmica en rocas pelíticas e ígneas del macizo de Roc de Frausa (Pirineo oriental) con la finalidad de comparar la evolución térmica de diferentes niveles de la corteza terrestre en un mismo evento orogénico. Las rocas que conforman el macizo formaban parte del margen norte de Gondwana y quedaron involucradas en la orogenia varisca al colisionar Gondwana con Laurentia-Baltica. Las rocas constituyen una serie Proterozoica superior a Paleozoica inferior afectadas por tres episodios deformativos, los dos primeros de edad varisca y el tercero alpina. En los micaesquistos con andalucita–sillimanita del nivel cortical superior, la andalucita y la sillimanita indican un incremento de temperatura de 580 °C a 640 °C coetáneo a la fábrica S1. La cordierita indica una descompresión isotérmica de 3.4 kbar a 2.6 kbar. Por encima de este nivel se emplazó un granitoide calco-alcalino intercinemáticamente entre D1 y D2 (314–311 Ma). Los niveles corticales medios están formados por esquistos con sillimanita-biotita-moscovita sin-S1 sobrecrecidos por cordierita y feldespato potásico post-S1. Estas asociaciones señalan una descompresión desde 5 a 3 kbar a 640–660 °C. Un stock gabro-diorítico intruyó sincrónico a D2 en dos pulsos magmáticos (312 y 307 Ma). En la aureola de contacto se distinguen cuatro tipos de migmatitas con diferentes texturas, asociaciones minerales y composiciones de roca y mineral que se explican mediante un modelo de perdida de fundido alternando con episodios de infiltración de fluido. Las asociaciones minerales indican condiciones PT de 7 kbar y 730 °C sin-D1 y una descompresión sin-D2 a 4.5 kbar. Los niveles corticales inferiores están formados por migmatitas cristalizadas entre 320–315 Ma. La cordierita sobrecrece las fábricas S1 y S2 ricas en biotita y con granate relicto incluido en plagioclasa e indica un equilibrio tardío a 3 kbar y 700 °C. D1 se interpreta como el resultado de un flujo horizontal de la corteza inferior, que podría relacionarse con un engrosamiento cortical moderado. D2 se caracteriza por una descompresión isotérmica que puede explicarse por una exhumación varisca tardía de los complejos metamórficos.
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Oczlon, Martin S. "Gondwana and Laurussia before and during Variscan orogeny in Europe and related areas ; Examples of paleozoic contourites, tempestites and turbidites - Classification and palaeogeographic approach /." Heidelberg : Rupreht-Karls-Universität, 1992. http://catalogue.bnf.fr/ark:/12148/cb374299510.

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Tabaud, Anne-Sophie. "Le magmatisme des Vosges : conséquence des subductions paléozoïques (datation, pétrologie, géochimie, ASM)." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAH003/document.

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Les Vosges sont caractérisées par la présence de nombreuses intrusions et extrusions magmatiques d’affinités variées. Elles constituent donc un excellent site d’étude pour contraindre, par la datation et la géochimie, l’évolution des évènements de ce segment de l’orogène Varisque. Ce travail révèle ainsi deux successions d’évènements magmatiques identiques, décalées dans le temps, caractérisent les domaines Moldanubien (360 à 320 Ma) et Saxothuringien (335 à 295 Ma). Ces successions d’évènements magmatiques résultent de deux processus majeurs. L’avancée des croûtes continentales subduites et sous-plaquées au niveau du Moho sous les blocs continentaux permet le passage du magmatisme calco-alcalin au magmatisme calco-alcalin riche en potassium. L’apport de chaleur par désintégration des éléments radiogéniques (K, U et Th) présents dans ces croûtes continentales subduites permet, dans un premier temps, la formation du magmatisme magnésio-potassique en profondeur. Dans un second temps, elle permet la formation du magmatisme d’origine crustale par l’intrusion du magmatisme magnésio-potassique, riche en K, U et Th, à la limite croûte moyenne - croûte supérieure. Ces successions d’évènements magmatiques et particulièrement, la présence des granites magnésio-potassiques, relient clairement les Vosges à la partie Est de l’orogène Varisque (Forêt Noire, Massif de Bohème, Alpes et Corse-Sardaigne)
The Vosges Mountains are characterized by the presence of numerous magmatic intrusions and extrusions of varied affinities. Accordingly, they constitute the best site to investigate, by dating and geochemistry, the evolution of the events affecting this segment of the Variscan orogeny. Two successions of identical magmatic events, shifted in the time, are identified, characterizing both Moldanubian (360 to 320 Ma) and the Saxothuringian (335 to 295 Ma) domains. These successions of magmatic events result of two major process. The progress of subducted and underplated continental crusts at Moho depth under continental blocks permits to shift from calc-alkaline to high potassic calc-alkaline magmatism. The radiogenic heat production from latter underplated continental crusts, in a first time, permits to generate magnesio-potassic magmas at depth. Then, this radiogenic heat permits to generate crustal magmas by intrusion of magnesio-potassic magmas rich in K, U and Th at mid-upper crust boundarie. These successions of magmatic events and particularly, the presence of the magnesio-potassic granites, imply a strong link between the Vosges Mts. and the eastern part of the Variscan orogeny (Black Forest, Bohemian Massif, the Alps and Corsica Batholith)
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Couzinié, Simon. "Evolution of the continental crust and significance of the zircon record, a case study from the French Massif Central." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSES035.

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La formation de la croute continentale est une des conséquences majeures de la différenciation de la Terre. Les avancées récentes dans la compréhension de ce phénomène résultent de l’amélioration des techniques analytiques permettant la mesure in situ des compositions isotopiques en U-Pb-Hf-O de grains de zircon, minéral abondant dans les roches crustales. Cette étude reconstitue l’histoire du segment de croute affleurant dans l’est du Massif Central français (MCF), portion de la chaine Varisque d’Europe de l’Ouest, dans le but d’évaluer les limites d’utilisation des zircons pour retracer l’évolution crustale. L’origine et la signification géodynamique des principales unités lithologiques du MCF ont été étudiées en combinant les approches classiques de la pétrologie avec des données isotopiques U-Pb-Hf-O acquises sur zircon. Deux incohérences majeures existent entre nos résultats et les conclusions tirées de l’étude des zircons considérés hors de leur contexte pétrologique, approche généralement suivie pour analyser l’évolution crustale. Les âges modèles calculés à partir des données Hf suggèrent une importante croissance crustale au Mésoproterozoique dans le MCF, en contradiction avec le fait que 60% de la croute locale soit d’âge Néoproterozoïque. De plus, 5 à 10% de la croute du MCF a été formée durant l’orogènese Varisque sans que cela ne soit enregistré par le zircon. Dans les deux cas, ces incohérences résultent du caractère hybride des signatures isotopiques portées par les zircons. Celles-ci ne peuvent être correctement détectées et interprétées qu’en disposant de données pétrologiques complémentaires sur les roches contenant les grains analysés
The formation of the continental crust is a major consequence of Earth differentiation. Understanding how the crust formed and evolved through time is paramount to locate the vast mineral deposits hosted therein and address its influence on the global climate, ultimately affecting the development of terrestrial life. Recent advances on the topic of continental crust evolution benefited from improvements of analytical techniques enabling in situ measurements of U-Pb- Hf-O isotope compositions in zircon, a widespread accessory mineral of continental igneous rocks. The time constrains derived from the U-Pb chronometer coupled with the petrogenetic information retrieved from Hf-O isotope signatures are currently used to unravel the diversity and succession of magmatic events affecting the continental crust at the regional and global scales. This study reconstructs the evolutionary path followed by the crust segment today exposed in the eastern part of the French Massif Central (FMC), a portion of the Variscan belt of Western Europe, with the aim to investigate the potential flaws of the zircon record of crust evolution. In this scope, the origin and geodynamic significance of the constituent FMC lithological units are tackled by combining conventional petrological observations with zircon U-Pb-Hf-O isotope data. The results obtained following this integrated approach are then confronted to the conclusions that would have been drawn solely from zircon isotopic signatures, taken out of their petrological context, as is commonly performed in studies investigating crust evolution. The oldest rocks of the FMC correspond to Ediacaran (590_550 Ma) meta-sediments deposited in back-arc basins along the northern Gondwana margin. Such basins were fed by a mixed detritus originating from the adjacent Cadomian magmatic arc and a distal Gondwana source, presumably the Sahara Metacraton. Partial melting of these meta-sediments at the Ediacaran/Cambrian boundary led to voluminous S-type granitic magmatism, pinpointing a first major crust reworking event in the FMC. The origin of anatexis likely stems from the transient thickening of the hot, back-arc crust caused by the flattening of the Cadomian subduction. Subordinate melting of the depleted backarc mantle at that time is also documented. During the Lower Paleozoic, rifting of the northern Gondwana provoked coeval crust and (limited) mantle melting. Mantle-derived igneous rocks show markedly diverse trace element and isotopic signatures, consistent with a very heterogeneous mantle source pervasively modi_ed by the Cadomian subduction. Finally, the Variscan collision resulted in crustal melting as evidenced by the emplacement of S-type granites and the formation of migmatite domes, the spatial distribution of which being partly controlled by the crustal architecture inherited from pre-orogenic events. Synchronous intrusion of mafic mantle-derived magmas and their differentiates testify for Variscan post-collisional new continental crust production in the FMC. Two major inconsistencies exist between these results and the zircon record. First, zircon Hf model ages would point to substantial Mesoproterozoic crust formation in the FMC whereas more than 60% of the crust is actually Neoproterozoic in age. Second, new additions to the continental crust volume during the Variscan orogeny are not recorded even though 5 to 10% of the exposed crust formed at that time. The origin of both discrepancies inherently lies in the mixed isotopic signature carried by many zircon grains. Such equivocal information can only be detected when additional petrological constrains on the zircon host rocks are available and provide guidance in interpreting the zircon record of crust evolution
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Schmelzbach, Cedric. "Seismic-Reflection and Seismic-Refraction Imaging of the South Portuguese Zone Fold-and-Thrust Belt." Doctoral thesis, Uppsala universitet, Geofysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8302.

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The South Portuguese Zone (SPZ), which host world-class massive sulphide deposits, forms the southern fold-and-thrust belt of the Iberian Variscan orogeny. This thesis focuses on seismic-reflection and seismic-refraction processing efforts on a subset of the IBERSEIS deep seismic-reflection data set aiming at resolving the SPZ upper crust in high resolution. A comparison of different crooked-line seismic-reflection imaging schemes showed that a processing sequence involving dip-moveout corrections, a common-midpoint projection, and poststack time migration of common-offset gathers provided the most coherent images considering the crooked acquisition geometry. Correlation with surface-geological data allows four units of different reflection character to be identified: the ~0–2 km deep Upper Carboniferous Flysch group, the highly reflective ~2–4 km thick and up to ~5 km deep Volcano-Sedimentary Complex (VSC) group, and two deep Paleozoic metasedimentary units, with the shallower Phyllite-Quartzite group exposed in an antiform. Prominent diffracted energy was enhanced using a modified Kirchhoff imaging routine. High reflectivity and distinct diffractions mark extensive dike bands at 6–12 km depth, possibly related to the intense hydrothermal activity that led to the formation of the ore-bearing VSC group. Source-generated noise obscures potential signals from depths shallower than ~500m depth on the seismic-reflection sections. P- and SV-wave first-arrival traveltimes were inverted for velocity models imaging the shallowest crust. Overall, the velocity models correlate well with surface-geological data marking high (>5.25 km/s) and uniform P-velocities for the Flysch unit in the southern SPZ. A prominent P-wave low-velocity body (~4.5 km/s) is resolved where the Phyllite-Quartzite unit forms the core of an antiform. P-velocities fluctuate the most in the northern SPZ with Flysch group units exhibiting high velocities (>5.25 km/s) and VSC group bodies showing intermediate velocities (~5 km/s). Low VP/VS-ratios (~1.8) computed for the southern profile part are interpreted as less deformed Flysch-group units, whereas high VP/VS-ratios (~1.9) indicate fractured units.
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El, Bakili Asmae. "Evolution tectono-metamorphique et chronologique des unités métamorphiques du Rif interne (Beni Bousera, Nord du Maroc)." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4034.

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Située à l'extrême-ouest de la Méditerranée occidentale, la chaîne bético-rifaine s’est formée au travers d’une histoire orogénique alpine complexe, impliquant des processus de subduction liés à la convergence entre l’Afrique et l’Eurasie depuis le Crétacé. Une découverte importante de ces quatre dernières décennies d'investigations géologiques, a été la mise en évidence des vestiges d’un événement varisque dans les zones internes de la chaîne. Ces résultats soulignent bien la présence de deux systèmes orogéniques superposés, les zones internes de la chaîne bético-rifaine demeurent donc des zones privilégiées pour étudier l’importance de l’héritage structural et métamorphique dans les réactivations partielles ou totale par les évènements les plus récents. Ce travail est localisé dans le secteur de Beni Bousera, ou affleurent les roches crustales et mantéliques qui forment les unités les plus internes de la chaîne. Il s’appuie sur une étude menée à partir des analyses structurales et pétrologiques, des datations U-Th-Pb sur monazite et 40Ar-39Ar sur des micas et des amphiboles. Il nous permet de résumer l’histoire de la chaîne bético-rifaine de la manière suivante : 1) un événement de HP-HT affecte la base du domaine interne à ca 281 ± 3 Ma. Ces nouvelles données pétrologiques et géochronologiques obtenues dans le Rif interne sont corrélées avec les Bétiques, les Kabylies et le massif de l'Edough en Algérie, la ceinture mauritanienne et les Appalaches. Elles attestent d'un domaine convergent au cours du Carbonifère supérieur- Permien inférieur. Tous ces segments orogéniques font partie des Variscides nord-africains construits à la marge nord-ouest du Gondwana en réponse à une convergence entre cette dernière et la Laurentia. 2) autour de 29-26 Ma, un événement métamorphique avec un gradient de type Barrovien à Abukuma affecte les Sebtides (les unités les plus internes de la chaîne), et il est interprété comme résultant de l'évolution de la plaque supérieure d'une zone de subduction. Cet évènement alpin est caractérisé par un chemin prograde marqué par un réchauffement à la base des Sebtides entre 26 et 22 Ma. De telles conditions reflètent un amincissement et un réchauffement de la croûte liée à la remontée asthénosphérique due au retrait de la plaque plongeante ; cet événement marque le début d’un évènement extensif majeur. 3) Au Miocène inférieur à 22-20 Ma, les zones internes (ou domaine d’Alboran) sont affectées par une extension E-W contemporaine de l’ouverture du bassin d'Alboran dans un contexte arrière-arc, et par l’intrusion de filons granitiques dans les péridotites et les unités métamorphiques crustales du domaine interne. Cet évènement a permis l’exhumation finale des Sebtides. 4) Du Miocène inférieur au Miocène moyen, la chaîne bético-rifaine a acquis sa géométrie arquée (l’arc de Gibraltar) suite à la collision entre les zones internes et les zones externes, attestée par une phase de raccourcissement majeur de direction NE-SW à E-W, et 5) l’arc de Gibraltar est affecté par une phase de raccourcissement N-S ante-Pliocène de direction N-S, qui a modifié considérablement sa géométrie
Located at the extreme tip of the western Mediterranean, the Betic-Rif orogenic system is built through a complex alpine orogenic history involving processes of subduction related to convergence between Africa and Eurasia since the Cretaceous. A remarkable discovery during the last four decades of geological investigations, has been the remains of a variscan event in the internal zones of the belt. These results underline the presence of two superimposed orogenic systems, the internal zones of the belt thus remain a privileged area to study the importance of the structural and the metamorphic heritage in the partial or total reactivation by the most recent events. This work is located in the Beni Bousera sector, where crustal and mantle rocks that form the innermost units of the chain are exposed. Based on structural and petrological analyses, U-Th-Pb dating on monazite and 40Ar-39Ar dating on micas and amphiboles. The history of the Betic-Rif belt can be summarized as it follows: 1) a HP-HT event affects the base of the internal domain at around 281 ± 3 Ma. These new petrological and geochronological data obtained in the internal Rif, are correlated with the Betics, the Kabyle, the Edough massif of Algeria, the Mauritanian, and the Appalachian belts, attesting a convergent domain during the late Carboniferous – early Permian. All of these orogenic segments are part of the North African Variscides built at the north-western margin of Gondwana in response to convergence between the later and Laurentia. 2) at around 29-26 Ma, a Barrovian to Abukuma metamorphic event affects the Sebtides (the innermost units of the chain) and interpreted as the evolution of the upper plate of a subduction zone. This alpine event is typically characterized by a prograde metamorphic path marked by heating affecting the base of the Sebtides between 26 to 22 Ma, such conditions reflect thinning and heating of the crust related to the asthenosphere upwelling due to slab roll-back. This event marks the beginning of a major extensive event. 3) In the Miocene around 22-20 Ma, the internal zones are affected by an E-W extension contemporary to the opening of the Alboran Basin in a back-arc context, and the intrusion of granitic dykes into the peridotites and crustal metamorphic units, the exhumation of the Sebtides was complete at this time. 4) From early to middle Miocène, the Betic-Rif belt acquired its arcuate geometry (the Gibraltar Arc) during the collision between the Internal and the external zones, attested by de NE-SW to E-W shortening phases across the arc. 5) more lately prior to Pliocene, the Gibraltar arc was subjected to contractional possess related to a N-S shortening phase, which drastically altered its geometry
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Monnier, Loïs. "Utilisation de la signature LA-ICPMS des quartz et des micas pour la reconstitution du fonctionnement d'un système magmatique et hydrothermal polyphasé. Application au complexe Sn-W d'Echassières (Massif central, France)." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30368.

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La zone d'Echassières (Massif Central) concentre un grand nombre de minéralisations magmatiques (Sn, Li, Ta, Nb) et hydrothermales (W, Sn, Sb) en quantité économique ou sub-économique. Les nouvelles données minéralogiques et inclusions fluides des différentes paragenèses hydrothermales de la zone, les signatures chimiques en éléments traces de plusieurs minéraux stratégiques (principalement le quartz, mais aussi les micas et la topaze), traitées par un large panel d'analyses multivariées, et les nouvelles datations U-Pb sur rutile, zircon et monazite, ont permis de mettre en évidence trois évènements hydrothermaux minéralisateurs majeurs à trois époques de l'histoire varisque (anté-Tournaisien, Viséen et Westphalien). Ces minéralisations seraient reliées à trois évènements magmatiques distincts, présentant des signatures en métaux spécifiques, mais induisant tous trois la cristallisation de wolframite
The Echassières area in the French Massif Central hosts a large number of economic to sub-economic magmatic (Sn, Li, Ta, Nb) and hydrothermal (W, Sn, Sb) mineralizations. This thesis produced new mineralogical and fluid inclusion data from various of the W-Sn mineralized hydrothermal systems, studied the trace chemical signature of several strategic gangue minerals (mostly quartz, but also micas and topaz) and processed the data using a spectrum of multivariate statistical approaches, obtained new U-Pb dating on rutile, zircon and monazite. Integration of all results made it possible to recognize the occurrence of three major mineralizing hydrothermal events in this region, which took place during three distinct periods of the variscan orogenic cycle (pre-Tournaisian, Visean and Westphalian). These mineralizations could be related to the intrusion of three distinct magmatic bodies, each with a specific paragenesis, yet, all leading to wolframite and cassiterite crystallization
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Books on the topic "Variscan orogeny"

1

Vozár, Jozef. Variscan and Alpine terranes of the Circum-Pannonian region. Bratislava: Slovak Academy of Sciences, Geological Institute, 2010.

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služba, Česká geologická, and International Union of Geodesy and Geophysics. General Assembly, eds. Eurogranites 2015: 'Variscan plutons of the Bohemian Massif' : post-conference field trip following the 26th IUGG General Assembly in Prague, July 3rd-8th, 2015. Prague: Czech Geological Survey, 2015.

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Lewandowski, Marek. Paleomagnetism of the Paleozoic rocks of the Holy Cross Mts (central Poland) and the origin of the Variscan orogen. Warszawa: Polska Akademia Nauk, Instytut Geofizyki, 1993.

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Linnemann, Ulf. Pre-Mesozoic geology of Saxo-Thuringia: From the Cadomian active margin to the Variscan Orogen. Stuttgart: Schweizerbart, 2010.

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Sokolovskiĭ, A. K. (Anatoliĭ Konstantinovich), ed. Pre-Mesozoic geology of Saxo-Thuringia: From the Cadomian active margin to the Variscan Orogen. Stuttgart: Schweizerbart, 2010.

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Orogenic processes: Quantification and modelling in the Variscan Belt. Bath: Geological Society Publishing House, 2000.

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Schulmann, K., J. R. Martínez Catalán, and J. M. Lardeaux. The Variscan Orogeny: Extent, Timescale and the Formation of the European Crust. Geological Society of London, 2014.

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P, Matte, and International Geological Correlation Programme. Project 233. Conference, eds. Terranes in the Variscan belt of Europe and circum-Atlantic paleozoic orogens: Papers from International IGCP Conference Project 233 held inMontpellier, France, in August 1988. Amsterdam: Elsevier, 1990.

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Book chapters on the topic "Variscan orogeny"

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Warr, L. N. "The Variscan Orogeny: the Welding of Pangaea." In Geological History of Britain and Ireland, 274–98. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118274064.ch15.

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Rast, N., and J. W. Skehan. "Appalachians in the Time Interval between the Grenville Orogeny and Variscan Collision." In Proceedings of the International Conferences on Basement Tectonics, 257–75. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4800-9_15.

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Henk, A. "Late-Orogenic Burial and Exhumation at a Major Variscan Suture Zone." In Proceedings of the International Conferences on Basement Tectonics, 3–15. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1598-5_1.

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Veselá, Petra, and Bernd Lammerer. "The Pfitsch-Mörchner Basin, an example of the post-Variscan sedimentary evolution in the Tauern Window (Eastern Alps)." In Orogenic Processes in the Alpine Collision Zone, S73—S88. Basel: Birkhäuser Basel, 2008. http://dx.doi.org/10.1007/978-3-7643-9950-4_5.

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Grzegorczyk, D., and H. Miller. "Joint Tectonics in a Folded Clastic Succession of the Variscan Orogen in the Rheinisches Schiefergebirge." In The Rhenish Massif, 95–103. Wiesbaden: Vieweg+Teubner Verlag, 1987. http://dx.doi.org/10.1007/978-3-663-01886-5_8.

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Thöny, Werner F., Peter Tropper, Friederike Schennach, Erwin Krenn, Friedrich Finger, Reinhard Kaindl, Franz Bernhard, and Georg Hoinkes. "The metamorphic evolution of migmatites from the Ötztal Complex (Tyrol, Austria) and constraints on the timing of the pre-Variscan high-T event in the Eastern Alps." In Orogenic Processes in the Alpine Collision Zone, S111—S126. Basel: Birkhäuser Basel, 2008. http://dx.doi.org/10.1007/978-3-7643-9950-4_7.

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Kröner, A., E. Hegner, J. Hammer, G. Haase, K. H. Bielicki, M. Krauss, and J. Eidam. "Geochronology and Nd-Sr systematics of Lusatian granitoids: significance for the evolution of the Variscan orogen in east-central Europe." In Active Continental Margins — Present and Past, 357–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-38521-0_12.

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Ouanaimi, Hassan, Abderrahmane Soulaimani, Christian Hoepffner, and André Michard. "The “Eovariscan Synmetamorphic Phase” of the Moroccan Meseta Domain Revisited; A Hint for Late Devonian Extensional Geodynamics Prior to the Variscan Orogenic Evolution." In The Structural Geology Contribution to the Africa-Eurasia Geology: Basement and Reservoir Structure, Ore Mineralisation and Tectonic Modelling, 259–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01455-1_56.

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"Variscan orogeny." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1477. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_220186.

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Franke, W., M. Ballèvre, L. R. M. Cocks, T. H. Torsvik, and A. Żelaźniewicz. "Variscan Orogeny." In Encyclopedia of Geology, 338–49. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-08-102908-4.00022-9.

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Conference papers on the topic "Variscan orogeny"

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Villasenor, Gabriel, E. J. Catlos, Brent Elliott, Milan Kohut, Igor Broska, Thomas M. Etzel, J. Richard Kyle, and Daniel F. Stockli. "TIMING OF RIFTING IN THE CENTRAL WESTERN CARPATHIANS POST-VARISCAN OROGENY AND AGES OF SEDIMENTS OVERLYING MELIATA OCEAN OPHIOLITES (SLOVAKIA)." In 54th Annual GSA South-Central Section Meeting 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020sc-343818.

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Stephan, Tobias, Uwe Kroner, and Rolf L. Romer. "MULTI-SAMPLE COMPARISON OF DETRITAL ZIRCON AGE SPECTRA OF LOWER PALEOZOIC UNITS FROM THE VARISCAN-APPALACHIAN OROGENIC BELT." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322288.

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Stephan, Tobias, Uwe Kroner, and Rolf L. Romer. "THE BIPARTITE EARLY PALEOZOIC GONDWANA SHELF: PALEOGEOGRAPHIC CONTROL ON THE SN-W MINERALIZATION ALONG THE VARISCAN-APPALACHIAN OROGENIC BELT." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321982.

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Reports on the topic "Variscan orogeny"

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Moreno Martín, Diana, and Rubén Díez Fernández. El basamento metamórfico en el sector oriental del Sistema Central: evolución tectonotermal varisca. Ilustre Colegio Oficial de Geólogos, February 2021. http://dx.doi.org/10.21028/dmm.2021.02.18.

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El basamento metamórfico del sector occidental de la Península Ibérica se configuró durante la Orogenia Varisca, fruto de la colisión entre Gondwana, Laurrusia y otros terrenos peri-continentales adyacentes que dio lugar a Pangea. Este basamento forma parte de la microplaca ibérica y se deformó durante la Orogenia Alpina junto con el resto de rocas sedimentarias del Mesozoico. El análisis tectonometamórfico del registro varisco en el sector oriental del Sistema Central, junto con datos regionales previos, y un análisis de las deformaciones alpinas sobreimpuestas, han permitido la reconstrucción local de la evolución tectónica ligada al ensamblado del último supercontinente. La primera fase de deformación corresponde con el engrosamiento cortical generado en los comienzos de la colisión continental, y se preserva en forma de relictos minerales formados durante este proceso. A la segunda fase se le atribuye la formación de la foliación principal, que está ligada al desarrollo de una zona de cizalla dúctil extensional responsable de la atenuación del sobreengrosamiento cortical previo, así como del reequilibrio térmico. La tercera fase de deformación produce pliegues erguidos y un clivaje de crenulación a partir de la foliación principal, y tiene lugar en un momento en el que la colisión continental de Gondwana y Laurrusia prosigue.
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