Synorogenic Basins

Oliveira, José Tomás; Clavijo, Emílio González; Alonso, Juan Luis Alonso; Armendáriz, Maider; Bahamonde, Juan R.; Braid, James A.; Colmenero, Juan Ramón; Silva, Í. Dias da; Fernandes, Paulo; Fernández, Luís Pedro; Gabaldón, V.; Jorge, Raul C.G.S.; Machado, Gil; Marcos, A.; Merino-Tomé, Oscar; Moreira, Noel; Murphy, J. Brendan; Jesus, A. Pinto de; Quesada, Cecilio; Rodrigues, Bruno; Rosales, Idoia; Sanz-López, Javier; Suárez, Andrés Santiago Suárez; Villa, Elisa; Piçarra, José Manuel; Pereira, Zélia

doi:10.1007/978-3-030-10519-8_11

Cited by 15 publications

(33 citation statements)

References 246 publications

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“…1). In SW Iberia, the South-Portuguese Zone (SPZ) is a tectonically imbricated Devonian to late Carboniferous stratigraphic sequence, facing towards the southwest, that consists of synorogenic marine sediments with abundant volcano-sedimentary components (Oliveira et al, 2019) with Laurusian affinity (Braid et al, 2011;Pérez Cáceres et a., 2017;Pereira et al, 2020). The Ossa Morena Zone (OMZ) represents the northern Gondwana margin (Quesada, 1991;Pereira et al, 2012), composed of Neoproterozoic, Cadomian-related, synorogenic sediments unconformably overlain by lower Cambrian to Lower Devonian passive-margin volcano-sedimentary sequences Gutierrez Marco et al, 2019), which are in turn unconformably overlain by Upper Devonian to early Carboniferous flysch basins (e.g.…”

Section: Geological Setting Of the Iberian Massifmentioning

confidence: 99%

“…The Ossa Morena Zone (OMZ) represents the northern Gondwana margin (Quesada, 1991;Pereira et al, 2012), composed of Neoproterozoic, Cadomian-related, synorogenic sediments unconformably overlain by lower Cambrian to Lower Devonian passive-margin volcano-sedimentary sequences Gutierrez Marco et al, 2019), which are in turn unconformably overlain by Upper Devonian to early Carboniferous flysch basins (e.g. Camargo Rocha et al, 2009;Oliveira et al, 2019).…”

Section: Geological Setting Of the Iberian Massifmentioning

confidence: 99%

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A first estimation of the contraction related to vertical axis rotation: the case of the Ibero-Armorican Arc formation

Casas

Guimerà

Álvarez-Marrón

et al. 2020

Preprint

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Abstract. Different models have been proposed to explain the formation of the Ibero-Armorican Arc, which require significant vertical axis rotations, at the end of the Variscan orogeny. Estimates of the amount of contraction (horizontal shortening) needed for these rotations range from 54 % to 91 % perpendicularly to the arc. These estimates are compared with coeval deformational structures developed in two areas of the orogen, one in the autochthonous hinterland underlying the Galicia-Trás-os-Montes Zone in the southern branch of the arc, and the other in the Cantabrian Zone foreland in the core of the arc. From this analysis it follows that the late Variscan deformation together with the subsequent Alpine contraction is not sufficient to explain the formation of the Ibero-Armorican Arc as a secondary structure by means of vertical axis rotations. Our analysis suggests this arc is mainly a primary, or non-rotational curve, slightly modified by ca. 10 % of superposed contraction during late Carboniferous and/or Alpine times. Moreover, we propose that the assumptions underlying the interpreted geometry of the arc be re-evaluated, and we discuss the role of late-Variscan regional strike-slip faults in the Iberian and in the Armorican massifs that probably acted consecutively before and during the contraction of the arc.

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Section: Geological Setting Of the Iberian Massifmentioning

confidence: 99%

Section: Geological Setting Of the Iberian Massifmentioning

confidence: 99%

A first estimation of the contraction related to vertical axis rotation: the case of the Ibero-Armorican Arc formation

Casas

Guimerà

Álvarez-Marrón

et al. 2020

Preprint

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“…1 a-b). These deposits, ranging from the base of the Mississipian to the upper part of the Pennsylvanian (Gzhelian), were accumulated in a highly subsiding marine foreland basin (Julivert, 1978;Marcos & Pulgar, 1982;Águeda et al, 1991;Bahamonde et al, 2015;Merino-Tomé et al, 2019) developed during the assemblage of the Pangea supercontinent (Fig. 1a).…”

Section: Introductionmentioning

confidence: 99%

A peculiar fusuline assemblage from the Tanes locality, Campo de Caso section (Pennsylvanian, Upper Moscovian; Cantabrian Zone, Spain)

Villa

Ueno

Merino-Tomé

et al. 2021

Spanish J. Palaeontol.

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The Campo de Caso section (eastern part of the Cantabrian Zone, NW Spain) exposes a middle to upper Moscovian (Middle Pennsylvanian) succession, up to 3500-m thick, consisting of marine shelfal and deltaic siliciclastic and shale deposits with numerous intercalated fossiliferous limestones. A limestone outcropping in the upper part of this section, close to the village of Tanes, has yielded a fusuline assemblage composed of species of the genera Eostaffella,

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“…In the southwestern edge of the European Variscan Belt (Fig. 1), the Iberian Massif preserves some of the best examples of Phanerozoic synorogenic marine basins, which reflect different tectonic settings along the belt during the Upper Devonian-late Carboniferous collision of Laurussia and Gondwana to form Pangea (e.g., Pereira et al, 2012aPereira et al, , b, 2017Oliveira et al, 2019b). In SW Iberia, the Late Devonian-late Carboniferous flysch basins appear on both sides of the oceanic suture that separates Laurussia from Gondwana (Silva et al, 1990;Braid et al, 2011;Pereira et al, 2012a;Pérez-Cáceres et al, 2017).…”

mentioning

confidence: 99%

“…This study presents new data and analysis of synorogenic rocks from marine basins located in the hinterland (internal zones) of the Variscan belt in NW Iberia. While synorogenic basins in the external zones of the orogen (the foreland fold and thrust belt) have been classically classified as foreland basins laying on top of north Gondwana Cambrian to Upper Devonian passive margin sequences (Marcos and Pulgar, 1982;Pastor-Galán et al, 2013;Gutiérrez-Alonso et al, 2015), the basins studied in this work are located in the hinterland and were deposited over rocks showing pervasive strain and that were metamorphosed to different degrees (Martínez Catalán et al, 2004, 2008Dias da Silva et al, 2015). The sedimentary sources of the synorogenic flysch and BIMF deposits are related to the development and unrooting of a Variscan accretionary prism (the Galicia-Trás-os-Montes Zone) onto Gondwana, and to the development of a peripheral bulge affecting the extensive passive margin of Gondwana (e.g., González Clavijo and Martínez Catalán, 2002;Keller et al, 2008;Dias da Silva et al, 2015).…”

mentioning

confidence: 99%

A tectonic carpet of Variscan flysch at the base of a rootless accretionary prism in northwestern Iberia: U–Pb zircon age constrains from sediments and volcanic olistoliths

Clavijo

Silva

Catalán³

et al. 2021

Solid Earth

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Abstract. The allochthonous complexes of Galicia–Trás-os-Montes Zone (NW Iberia) are part of a rootless tectonic stack which preserves part of a Variscan accretionary prism. They are formed by individual tectonic slices marked by specific tectonometamorphic evolutions, which were piled up in a piggy-back mode onto its relative autochthon, the Central Iberian Zone (CIZ). Allochthony decreases from the structurally upper thrust sheets towards the lower ones. The lowermost unit of the stack is known as the Parautochthon or Schistose Domain. It is characterized by a low metamorphic grade in contrast with higher temperatures and/or pressures estimated for the overlying allochthonous units and shares the stratigraphic sequence with the underlying autochthon. The Parautochthon is divided in two structural and stratigraphic sub-units: (i) the Lower Parautochthon (LPa) is made of synorogenic flysch-type sediments with varied turbiditic units and olistostrome bodies, showing Upper Devonian–lower Carboniferous age according to the youngest zircon populations and fossiliferous content; (ii) the Upper Parautochthon (UPa) is composed of highly deformed preorogenic upper Cambrian–Silurian volcano-sedimentary sequence comparable with the nearby autochthon and to some extent, also with the high-P and low-T Lower Allochthon laying structurally above. The UPa was emplaced onto the LPa along the Main-Trás-os-Montes Thrust, and the LPa became detached from the CIZ relative autochthon by a regional-scale structure, the Basal Lower Parautochthon Detachment, which follows a weak horizon of Silurian carbonaceous slates. A review on the detrital zircon studies on the synorogenic LPa complemented by zircon dating of 17 new samples is presented here. The results support the extension of the LPa underneath the NW Iberian allochthonous complexes, from Cabo Ortegal, to Bragança and Morais massifs. Its current exposure follows the lowermost tectonic boundary between the Galicia–Trás-os-Montes (allochthon) and Central Iberian (autochthon) zones. The youngest zircon age populations point to a maximum sedimentation age for the LPa formations ranging from Famennian to Serpukhovian and supports the piggy-back mode of emplacement of the Galicia–Trás-os-Montes Zone, of which it represents the latest imbricate. The zircon age populations in the LPa allow the sedimentary provenance areas to be constrained, showing the intervention of nearby sources (mostly the UPa) and/or multiply recycled and long-transport sediments with a typically north-central Gondwana age fingerprint, also found in the Lower Allochthon, UPa and Autochthon. Complementary geochronology of volcanic olistoliths trapped in the LPa sediments and of late Cambrian to Upper Ordovician rhyolites from the UPa is also presented. It shows a direct relationship between the major blocks source area (UPa) and the setting place (LPa). Old zircon age patterns show that the LPa sedimentary rocks were recycled from detrital rocks of the allochthon (advancing wedge) and the nearby autochthon (peripheral bulge).

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Synorogenic Basins

Cited by 15 publications

References 246 publications

A first estimation of the contraction related to vertical axis rotation: the case of the Ibero-Armorican Arc formation

A first estimation of the contraction related to vertical axis rotation: the case of the Ibero-Armorican Arc formation

A peculiar fusuline assemblage from the Tanes locality, Campo de Caso section (Pennsylvanian, Upper Moscovian; Cantabrian Zone, Spain)

A tectonic carpet of Variscan flysch at the base of a rootless accretionary prism in northwestern Iberia: U–Pb zircon age constrains from sediments and volcanic olistoliths

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