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

[EN]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...

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Authors: Gónzalez Clavijo, Emilio José, Dias da Silva, Ícaro, Martínez Catalán, José Ramón, Gómez Barreiro, Juan, Gutiérrez Alonso, Gabriel, Díez Montes, Alejandro, Hofmann, Mandy, Gärtner, Andreas, Linnemann, Ulf
Format: article
Status:Published version
Publication Date:2021
Country:España
Institution:Universidad de Salamanca (USAL)
Repository:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/166851
Online Access:http://hdl.handle.net/10366/166851
Access Level:Open access
Keyword:Iberian massif
Variscan belt
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spelling 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 olistolithsGónzalez Clavijo, Emilio JoséDias da Silva, ÍcaroMartínez Catalán, José RamónGómez Barreiro, JuanGutiérrez Alonso, GabrielDíez Montes, AlejandroHofmann, MandyGärtner, AndreasLinnemann, UlfIberian massifVariscan belt[EN]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.EGU publications202520252021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10366/166851reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésFCT/UIDB/50019/2020-IDLSFRH/BPD/99550/2014CGL2016-78560-PDE-TAF- 5798GC2018–096534-B-10014.Y26.31.0012info:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1668512026-06-07T06:28:51Z
dc.title.none.fl_str_mv 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
title 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
spellingShingle 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
Gónzalez Clavijo, Emilio José
Iberian massif
Variscan belt
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
dc.creator.none.fl_str_mv Gónzalez Clavijo, Emilio José
Dias da Silva, Ícaro
Martínez Catalán, José Ramón
Gómez Barreiro, Juan
Gutiérrez Alonso, Gabriel
Díez Montes, Alejandro
Hofmann, Mandy
Gärtner, Andreas
Linnemann, Ulf
author Gónzalez Clavijo, Emilio José
author_facet Gónzalez Clavijo, Emilio José
Dias da Silva, Ícaro
Martínez Catalán, José Ramón
Gómez Barreiro, Juan
Gutiérrez Alonso, Gabriel
Díez Montes, Alejandro
Hofmann, Mandy
Gärtner, Andreas
Linnemann, Ulf
author_role author
author2 Dias da Silva, Ícaro
Martínez Catalán, José Ramón
Gómez Barreiro, Juan
Gutiérrez Alonso, Gabriel
Díez Montes, Alejandro
Hofmann, Mandy
Gärtner, Andreas
Linnemann, Ulf
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Iberian massif
Variscan belt
topic Iberian massif
Variscan belt
description [EN]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.
publishDate 2021
dc.date.none.fl_str_mv 2021
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/166851
url http://hdl.handle.net/10366/166851
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv FCT/UIDB/50019/2020-IDL
SFRH/BPD/99550/2014
CGL2016-78560-P
DE-TAF- 5798
GC2018–096534-B-100
14.Y26.31.0012
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EGU publications
publisher.none.fl_str_mv EGU publications
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869424782402912256
score 15.223283

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