Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints

Detalhes bibliográficos
Autor(a) principal: ROSEIRO, José
Data de Publicação: 2019
Outros Autores: Moreira, Noel, NOGUEIRA, Pedro, MAIA, Miguel, ARAÚJO, António, PEDRO, Jorge
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/27457
Resumo: Chemical features regarding the different detrital lithostratigraphic Palaeozoic (Cambrian – Devonian) units from the Portuguese sector of the Ossa-Morena Zone regist geochemical aspects typical of their depositional environment, which allow inferences on the geodynamic evolution of the Iberian Authoctonous Terrain during the Variscan Cycle. Trace elements relationships (essentialy Nb/Ta, Zr/Hf, Th/U, La/Th-Sc and REE chondrite-normalized patterns) of the detrital succession reveal that the different formations derive mostly from an acid continental source, though with features that suggest mixed sedimentary components. Cambrian, Ordovician and Silurian representative samples show significative influences typical of passive margin sediments, while Devonian samples appear to have an oceanic arc contribution, with an increase in basic components, which may indicate a transition on the tectonic environment, during their deposition. Ante-Devonian Variscan formations are therefore interpreted as representing debris deposition, derived from the progressive dismantling of a continental basement (Cadomian arc and Gondwana terranes), in sedimentary basins formed during the lower Cambrian crustal thinning episode. Contrastingly, Devonian units correspond to etasedimentary rocks derived from a dismembered (basic-intermediate) volcanic arc, revealing an active margin in the SW Ossa-Morena Zone during this period.
id RCAP_f5165627f9f25653de8bf693ac61ea1b
oai_identifier_str oai:dspace.uevora.pt:10174/27457
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraintsZona de Ossa-MorenaGeoquímicaTrace Element GeochemistryChemical features regarding the different detrital lithostratigraphic Palaeozoic (Cambrian – Devonian) units from the Portuguese sector of the Ossa-Morena Zone regist geochemical aspects typical of their depositional environment, which allow inferences on the geodynamic evolution of the Iberian Authoctonous Terrain during the Variscan Cycle. Trace elements relationships (essentialy Nb/Ta, Zr/Hf, Th/U, La/Th-Sc and REE chondrite-normalized patterns) of the detrital succession reveal that the different formations derive mostly from an acid continental source, though with features that suggest mixed sedimentary components. Cambrian, Ordovician and Silurian representative samples show significative influences typical of passive margin sediments, while Devonian samples appear to have an oceanic arc contribution, with an increase in basic components, which may indicate a transition on the tectonic environment, during their deposition. Ante-Devonian Variscan formations are therefore interpreted as representing debris deposition, derived from the progressive dismantling of a continental basement (Cadomian arc and Gondwana terranes), in sedimentary basins formed during the lower Cambrian crustal thinning episode. Contrastingly, Devonian units correspond to etasedimentary rocks derived from a dismembered (basic-intermediate) volcanic arc, revealing an active margin in the SW Ossa-Morena Zone during this period.Universidade de Évora2020-02-28T09:51:09Z2020-02-282019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/27457http://hdl.handle.net/10174/27457engROSEIRO, J., MOREIRA, N., NOGUEIRA, P., MAIA, M., ARAÚJO, A., PEDRO, J. (2019). Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints. XII Congresso Ibérico de Geoquímica | XX Semana da Geoquímica (Évora), 153-156.ze.roseiro45@gmail.comnafm@uevora.ptpmn@uevora.ptmcmaiageo@gmail.comaaraujo@uevora.ptjpedro@uevora.pt250ROSEIRO, JoséMoreira, NoelNOGUEIRA, PedroMAIA, MiguelARAÚJO, AntónioPEDRO, Jorgeinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:22:57Zoai:dspace.uevora.pt:10174/27457Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:17:32.439752Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
title Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
spellingShingle Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
ROSEIRO, José
Zona de Ossa-Morena
Geoquímica
Trace Element Geochemistry
title_short Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
title_full Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
title_fullStr Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
title_full_unstemmed Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
title_sort Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
author ROSEIRO, José
author_facet ROSEIRO, José
Moreira, Noel
NOGUEIRA, Pedro
MAIA, Miguel
ARAÚJO, António
PEDRO, Jorge
author_role author
author2 Moreira, Noel
NOGUEIRA, Pedro
MAIA, Miguel
ARAÚJO, António
PEDRO, Jorge
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv ROSEIRO, José
Moreira, Noel
NOGUEIRA, Pedro
MAIA, Miguel
ARAÚJO, António
PEDRO, Jorge
dc.subject.por.fl_str_mv Zona de Ossa-Morena
Geoquímica
Trace Element Geochemistry
topic Zona de Ossa-Morena
Geoquímica
Trace Element Geochemistry
description Chemical features regarding the different detrital lithostratigraphic Palaeozoic (Cambrian – Devonian) units from the Portuguese sector of the Ossa-Morena Zone regist geochemical aspects typical of their depositional environment, which allow inferences on the geodynamic evolution of the Iberian Authoctonous Terrain during the Variscan Cycle. Trace elements relationships (essentialy Nb/Ta, Zr/Hf, Th/U, La/Th-Sc and REE chondrite-normalized patterns) of the detrital succession reveal that the different formations derive mostly from an acid continental source, though with features that suggest mixed sedimentary components. Cambrian, Ordovician and Silurian representative samples show significative influences typical of passive margin sediments, while Devonian samples appear to have an oceanic arc contribution, with an increase in basic components, which may indicate a transition on the tectonic environment, during their deposition. Ante-Devonian Variscan formations are therefore interpreted as representing debris deposition, derived from the progressive dismantling of a continental basement (Cadomian arc and Gondwana terranes), in sedimentary basins formed during the lower Cambrian crustal thinning episode. Contrastingly, Devonian units correspond to etasedimentary rocks derived from a dismembered (basic-intermediate) volcanic arc, revealing an active margin in the SW Ossa-Morena Zone during this period.
publishDate 2019
dc.date.none.fl_str_mv 2019-01-01T00:00:00Z
2020-02-28T09:51:09Z
2020-02-28
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/27457
http://hdl.handle.net/10174/27457
url http://hdl.handle.net/10174/27457
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv ROSEIRO, J., MOREIRA, N., NOGUEIRA, P., MAIA, M., ARAÚJO, A., PEDRO, J. (2019). Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints. XII Congresso Ibérico de Geoquímica | XX Semana da Geoquímica (Évora), 153-156.
ze.roseiro45@gmail.com
nafm@uevora.pt
pmn@uevora.pt
mcmaiageo@gmail.com
aaraujo@uevora.pt
jpedro@uevora.pt
250
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade de Évora
publisher.none.fl_str_mv Universidade de Évora
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799136657704747008