Articles | Volume 12, issue 4
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https://doi.org/10.5194/se-12-835-2021
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the Creative Commons Attribution 4.0 License.
Research article
| 
15 Apr 2021
Research article |
| 15 Apr 2021
| 15 Apr 2021
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
Emilio González Clavijo
Instituto Geológico y Minero de España, Plaza de la
Constitución 1, 3rd, 37001 Salamanca, Spain
Ícaro Dias da Silva
CORRESPONDING AUTHOR
Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa,
Campo Grande, 1749-016 Lisbon, Portugal
Departamento de Geologia, Faculdade de Ciências, Universidade de
Lisboa, Campo Grande, 1749-016 Lisbon, Portugal
José R. Martínez Catalán
Departamento de Geología, Universidad de Salamanca. Plaza de la
Merced, s/n, 37008 Salamanca, Spain
Juan Gómez Barreiro
Departamento de Geología, Universidad de Salamanca. Plaza de la
Merced, s/n, 37008 Salamanca, Spain
Gabriel Gutiérrez-Alonso
Departamento de Geología, Universidad de Salamanca. Plaza de la
Merced, s/n, 37008 Salamanca, Spain
Alejandro Díez Montes
Instituto Geológico y Minero de España, Plaza de la
Constitución 1, 3rd, 37001 Salamanca, Spain
Mandy Hofmann
Senckenberg Naturhistorische Sammlungen Dresden, Königsbrücker
Landstr. 159, 01109 Dresden, Germany
Andreas Gärtner
Senckenberg Naturhistorische Sammlungen Dresden, Königsbrücker
Landstr. 159, 01109 Dresden, Germany
Ulf Linnemann
Senckenberg Naturhistorische Sammlungen Dresden, Königsbrücker
Landstr. 159, 01109 Dresden, Germany
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Puy Ayarza, José Ramón Martínez Catalán, Ana Martínez García, Juan Alcalde, Juvenal Andrés, José Fernando Simancas, Immaculada Palomeras, David Martí, Irene DeFelipe, Chris Juhlin, and Ramón Carbonell
Solid Earth, 12, 1515–1547, https://doi.org/10.5194/se-12-1515-2021, https://doi.org/10.5194/se-12-1515-2021, 2021
Short summary
Short summary
Vertical incidence seismic profiling on the Iberian Massif images a mid-crustal-scale discontinuity at the top of the reflective lower crust. This feature shows that upper- and lower-crustal reflections merge into it, suggesting that it has often behaved as a detachment. The orogen-scale extension of this discontinuity, present in Gondwanan and Avalonian affinity terranes into the Iberian Massif, demonstrates its relevance, leading us to interpret it as the Conrad discontinuity.
J. Javier Álvaro, Teresa Sánchez-García, Claudia Puddu, Josep Maria Casas, Alejandro Díez-Montes, Montserrat Liesa, and Giacomo Oggiano
Solid Earth, 11, 2377–2409, https://doi.org/10.5194/se-11-2377-2020, https://doi.org/10.5194/se-11-2377-2020, 2020
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A geochemical comparison of early Palaeozoic felsic magmatic episodes throughout the south-western European margin of Gondwana is analysed and includes data from the Iberian Massif, the Eastern Pyrenees, southern France and Sardinia. This dataset favours partial melting of sediments and/or granitoids in the lower continental crust during extensional movements related to the opening of the Rheic Ocean.
José Manuel Benítez-Pérez, Pedro Castiñeiras, Juan Gómez-Barreiro, José R. Martínez Catalán, Andrew Kylander-Clark, and Robert Holdsworth
Solid Earth, 11, 2303–2325, https://doi.org/10.5194/se-11-2303-2020, https://doi.org/10.5194/se-11-2303-2020, 2020
Short summary
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The Sobrado unit represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust. We have combined U–Pb geochronology and REE analyses (LASS-ICP-MS) of accessory minerals in migmatitic paragneiss (monazite, zircon) and mylonitic amphibolites (titanite) to constrain the evolution. A Middle Devonian minimum age for HP metamorphism has been obtained.
Josep Maria Casas, Joan Guimerà, Joaquina Alvarez-Marron, and Ícaro Días da Silva
Solid Earth Discuss., https://doi.org/10.5194/se-2020-126, https://doi.org/10.5194/se-2020-126, 2020
Revised manuscript not accepted
Short summary
Short summary
Many orogenic belts exhibit arcuate form in map view. We deal with the different models proposed to explain the formation of the Ibero-Armorican Arc in the western European Variscan Belt. We suggest this arc is primary slightly modified by superposed contraction during late Carboniferous and/or Alpine times. 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.
Manuel Francisco Pereira, Cristina Gama, Ícaro Dias da Silva, José Brandão Silva, Mandy Hofmann, Ulf Linnemann, and Andreas Gärtner
Solid Earth, 11, 1291–1312, https://doi.org/10.5194/se-11-1291-2020, https://doi.org/10.5194/se-11-1291-2020, 2020
Short summary
Short summary
A chronostratigraphic study was conducted on Carboniferous rocks of SW Iberia. Terrigenous strata with a maximum depositional age of ca. 303 Ma unconformably overlie marine deposits and volcanic rocks dated at ca. 335–331 Ma. Lying below this unconformity, the marine deposits are intruded and overlain by a ca. 317 Ma porphyry. Detrital zircon populations from marine deposits indicate derivation from Laurussian terranes, while the terrestrial rocks are related to Laurussia and Gondwana sources.
Daniel Pastor-Galán, Gabriel Gutiérrez-Alonso, and Arlo B. Weil
Solid Earth, 11, 1247–1273, https://doi.org/10.5194/se-11-1247-2020, https://doi.org/10.5194/se-11-1247-2020, 2020
Short summary
Short summary
Pangea was assembled during Devonian to early Permian times and resulted in a large-scale and winding orogeny that today transects Europe, northwestern Africa, and eastern North America. This orogen is characterized by an
Sshape corrugated geometry in Iberia. 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 paid to structural and paleomagnetic studies.
Pedro Castiñeiras, Juan Gómez Barreiro, Francisco J. Fernández, Carmen Aguilar, and José Manuel Benítez Pérez
Solid Earth Discuss., https://doi.org/10.5194/se-2020-53, https://doi.org/10.5194/se-2020-53, 2020
Revised manuscript not accepted
Francisco J. Rubio Pascual, Luis M. Martín Parra, Pablo Valverde-Vaquero, Alejandro Díez Montes, Manuel P. Hacar Rodríguez, Justo Iglesias, Rubén Díez Fernández, Gloria Gallastegui, Nemesio Heredia, and L. Roberto Rodríguez Fernández
Solid Earth Discuss., https://doi.org/10.5194/se-2020-25, https://doi.org/10.5194/se-2020-25, 2020
Preprint withdrawn
Jana Krautz, Mandy Hofmann, Andreas Gärtner, Ulf Linnemann, and Arno Kleber
E&G Quaternary Sci. J., 67, 7–16, https://doi.org/10.5194/egqsj-67-7-2018, https://doi.org/10.5194/egqsj-67-7-2018, 2018
Juvenal Andrés, Juan Alcalde, Puy Ayarza, Eduard Saura, Ignacio Marzán, David Martí, José Ramón Martínez Catalán, Ramón Carbonell, Andrés Pérez-Estaún, José Luis García-Lobón, and Félix Manuel Rubio
Solid Earth, 7, 827–841, https://doi.org/10.5194/se-7-827-2016, https://doi.org/10.5194/se-7-827-2016, 2016
Related subject area
Subject area: The evolving Earth surface | Editorial team: Stratigraphy, sedimentology, geomorphology, morphotectonics, and palaeontology | Discipline: Stratigraphy
Chronostratigraphic framework and provenance of the Ossa-Morena Zone Carboniferous basins (southwest Iberia)
Manuel Francisco Pereira, Cristina Gama, Ícaro Dias da Silva, José Brandão Silva, Mandy Hofmann, Ulf Linnemann, and Andreas Gärtner
Solid Earth, 11, 1291–1312, https://doi.org/10.5194/se-11-1291-2020, https://doi.org/10.5194/se-11-1291-2020, 2020
Short summary
Short summary
A chronostratigraphic study was conducted on Carboniferous rocks of SW Iberia. Terrigenous strata with a maximum depositional age of ca. 303 Ma unconformably overlie marine deposits and volcanic rocks dated at ca. 335–331 Ma. Lying below this unconformity, the marine deposits are intruded and overlain by a ca. 317 Ma porphyry. Detrital zircon populations from marine deposits indicate derivation from Laurussian terranes, while the terrestrial rocks are related to Laurussia and Gondwana sources.
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Short summary
In northwest Iberia, a low-grade unit separates the unrooted accretionary prism from the autochthon. It was divided into Upper (preorogenic) and Lower (synorogenic) parautochthons around the Morais Complex. A review of the sedimentary sequence characteristics, supported by U–Pb ages in 17 new samples of synorogenic sediments and volcanic olistoliths, proposes this model to show the Galicia–Trás-os-Montes Zone forming a tectonic carpet exposed in most of the Parautochthon–Autochthon limit.
In northwest Iberia, a low-grade unit separates the unrooted accretionary prism from the...
