Publicação
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
| Resumo: | 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). |
|---|---|
| Autores principais: | Clavijo, Emilio |
| Outros Autores: | Silva, Ícaro; Martínez Catalán, José R.; Gómez Barreiro, Juan; Gutiérrez-Alonso, Gabriel; Díez Montes, Alejandro; Hofmann, Mandy; Gärtner, Andreas; Linnemann, Ulf |
| Assunto: | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| _version_ | 1866809510401671168 |
|---|---|
| author | Clavijo, Emilio |
| author2 | Silva, Ícaro Martínez Catalán, José R. 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 |
| author_facet | Clavijo, Emilio Silva, Ícaro Martínez Catalán, José R. Gómez Barreiro, Juan Gutiérrez-Alonso, Gabriel Díez Montes, Alejandro Hofmann, Mandy Gärtner, Andreas Linnemann, Ulf |
| author_role | author |
| contributor_name_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Clavijo, Emilio\",\"Person.identifier.orcid\":\"0000-0002-8876-2987\"},{\"Person.name\":\"Silva, Ícaro\",\"Person.identifier.orcid\":\"0000-0002-0185-9410\"},{\"Person.name\":\"Martínez Catalán, José R.\",\"Person.identifier.orcid\":\"0000-0002-2422-2244\"},{\"Person.name\":\"Gómez Barreiro, Juan\"},{\"Person.name\":\"Gutiérrez-Alonso, Gabriel\"},{\"Person.name\":\"Díez Montes, Alejandro\"},{\"Person.name\":\"Hofmann, Mandy\"},{\"Person.name\":\"Gärtner, Andreas\"},{\"Person.name\":\"Linnemann, Ulf\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| datacite.creators.creator.creatorName.fl_str_mv | Clavijo, Emilio Silva, Ícaro Martínez Catalán, José R. Gómez Barreiro, Juan Gutiérrez-Alonso, Gabriel Díez Montes, Alejandro Hofmann, Mandy Gärtner, Andreas Linnemann, Ulf |
| datacite.date.Accepted.fl_str_mv | 2021-04-15T00:00:00Z |
| datacite.date.available.fl_str_mv | 2022-02-23T15:03:31Z |
| datacite.date.embargoed.fl_str_mv | 2022-02-23T15:03:31Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| datacite.titles.title.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 |
| dc.contributor.none.fl_str_mv | Repositório Científico de Acesso Aberto da ULisboa |
| dc.creator.none.fl_str_mv | Clavijo, Emilio Silva, Ícaro Martínez Catalán, José R. Gómez Barreiro, Juan Gutiérrez-Alonso, Gabriel Díez Montes, Alejandro Hofmann, Mandy Gärtner, Andreas Linnemann, Ulf |
| dc.date.Accepted.fl_str_mv | 2021-04-15T00:00:00Z |
| dc.date.available.fl_str_mv | 2022-02-23T15:03:31Z |
| dc.date.embargoed.fl_str_mv | 2022-02-23T15:03:31Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10451/51471 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | EGU |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| dc.title.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 |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | 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). |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://repositorio.ulisboa.pt/bitstreams/c7a9ed31-bf59-4c1c-8383-3d7d36a0b9a9/download |
| funding.funder.alternateName_str_mv | FCT |
| funding.funder.identifier_str_mv | http://doi.org/10.13039/501100001871 |
| funding.funder.name_str_mv | Fundação para a Ciência e a Tecnologia |
| funding.name_str_mv | OE |
| id | ul_5ccd2f66ea89824fb1856efdbfcd9887 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10451/51471 |
| instacron_str | ul |
| institution | Universidade de Lisboa |
| instname_str | Universidade de Lisboa |
| language | eng |
| network_acronym_str | ul |
| network_name_str | Repositório da Universidade de Lisboa |
| oai_identifier_str | oai:repositorio.ulisboa.pt:10451/51471 |
| organization_str_mv | urn:organizationAcronym:ul |
| person_str_mv | Clavijo, Emilio Clavijo, Emilio https://www.ciencia-id.pt/7B16-2D09-6910 7B16-2D09-6910 http://orcid.org/0000-0002-8876-2987 0000-0002-8876-2987 Silva, Ícaro Silva, Ícaro https://www.ciencia-id.pt/411B-CB2C-FAC4 411B-CB2C-FAC4 http://orcid.org/0000-0002-0185-9410 0000-0002-0185-9410 Martínez Catalán, José R. Martínez Catalán, José R. http://orcid.org/0000-0002-2422-2244 0000-0002-2422-2244 Gómez Barreiro, Juan Gutiérrez-Alonso, Gabriel Díez Montes, Alejandro Hofmann, Mandy Gärtner, Andreas Linnemann, Ulf |
| publishDate | 2021 |
| publisher.none.fl_str_mv | EGU |
| reponame_str | Repositório da Universidade de Lisboa |
| repository_id_str | urn:repositoryAcronym:ul |
| service_str_mv | urn:repositoryAcronym:ul |
| spelling | engEGUpt_PTThe 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).application/pdfpt_PTA 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 olistolithsPersonalClavijo, EmilioDSpacehttp://dspace.org/items/66b3f980-4c91-416b-9c8f-3343b23496d6DSpacehttp://dspace.org/items/66b3f980-4c91-416b-9c8f-3343b23496d6González ClavijoEmilio JoséCiência IDhttps://www.ciencia-id.pt7B16-2D09-6910ORCIDhttp://orcid.org0000-0002-8876-2987PersonalSilva, ÍcaroDSpacehttp://dspace.org/items/e1d47a59-3279-4a15-9b49-7b5772c6cad2DSpacehttp://dspace.org/items/e1d47a59-3279-4a15-9b49-7b5772c6cad2Fróis Dias da SilvaÍcaroCiência IDhttps://www.ciencia-id.pt411B-CB2C-FAC4ORCIDhttp://orcid.org0000-0002-0185-9410Scopus Author IDhttps://www.scopus.com55508256500PersonalMartínez Catalán, José R.DSpacehttp://dspace.org/items/5f8dd062-deaa-47f8-bee7-5cf0e6c28bd0DSpacehttp://dspace.org/items/5f8dd062-deaa-47f8-bee7-5cf0e6c28bd0Martínez CatalánJosé R.ORCIDhttp://orcid.org0000-0002-2422-2244Gómez Barreiro, JuanGutiérrez-Alonso, GabrielDíez Montes, AlejandroHofmann, MandyGärtner, AndreasLinnemann, UlfHostingInstitutionOrganizationalRepositório Científico de Acesso Aberto da ULisboae-mailmailto:repositorio@reitoria.ulisboa.ptrepositorio@reitoria.ulisboa.ptDOIIsPartOf10.5194/se-12-835-20212022-02-23T15:03:31Z2021-04-152021-04-15T00:00:00ZHandlehttp://hdl.handle.net/10451/51471http://purl.org/coar/access_right/c_abf2open accessResearch Subject Categories::NATURAL SCIENCES::Earth sciences31684540 bytesFundação para a Ciência e a TecnologiaZonas de cisalhamento: sua importância para a arquitetura da litosfera Paleozoica e papel no estabelecimento de jazidas auríferas nas Zonas Galiza-Trás-os-Montes, Centro Ibérica e Ossa Morena.OECrossref Funder IDhttp://doi.org/10.13039/501100001871literaturehttp://purl.org/coar/resource_type/c_6501journal article2021-04-15http://creativecommons.org/licenses/by/4.0/http://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://repositorio.ulisboa.pt/bitstreams/c7a9ed31-bf59-4c1c-8383-3d7d36a0b9a9/downloadSolid Earth124835867 |
| 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 Clavijo, Emilio Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| status | SINGLETON |
| subject.fl_str_mv | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| 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 |
| 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_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_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 |
| topic | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| topic_facet | Research Subject Categories::NATURAL SCIENCES::Earth sciences |
| url | http://hdl.handle.net/10451/51471 |
| visible | 1 |