Trace element features of Palaeozoic detrital units of the Ossa-Morena Zone (Portugal): geodynamic constraints
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
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. |
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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 |
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1799136657704747008 |