Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin

Detalhes bibliográficos
Autor(a) principal: Fuenlabrada, J.M.
Data de Publicação: 2020
Outros Autores: Arenas, R., Sanchez Martinez, S., Diez Fernandez, R., Pieren, A.P., Pereira, M.F., Chichorro, M., Silva, J.B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/32581
https://doi.org/10.1016/j.earscirev.2019.103079
Resumo: The geochemical and isotopic (Sm-Nd) features of the Ediacaran-Cambrian siliciclastic series from the Central Iberian Zone and the Iberian Allochthonous Domains indicate a significant paleogeographic change at the northern margin of Gondwana, associated with the development of the Avalonian-Cadomian arc. During the Neoproterozoic, the opening of a peri-Gondwanan back-arc basin and its subsequent widening during the Cambrian led to a progressive separation of the sedimentary basins from the main focus of the probably waning Cadomian magmatic arc activity. This work presents a paleogeographic reconstruction of the distribution of the Iberian terranes along the North Gondwanan margin during Ediacaran and Cambrian times, based on the geochemical and Nd-isotope data from the Iberian Allochthonous and Autochthonous Domains. These results suggest a location close to the West Africa Craton for both the allochthonous and autochthonous terranes, but they would be distributed laterally along the northern margin of Gondwana, occupying arc- or continental-ward positions within a wide back-arc basin. In this context, the peri-Gondwanan volcanic arc acted as the main supplier of the abundant juvenile material, as reflected in positive values of εNd and young TDM model ages (720–1215 Ma) of the Middle Cambrian siliciclastic series from NW Iberia Upper Allochthonous Units. On the other hand, the rather equivalent geochemical and isotopic features of the sedimentary series of the NW and SW Iberia Basal Allochthonous Units suggest a common paleolocation for those series, yet within the back-arc basin ainland and older isotope sources. The sedimentary series of these terranes present the oldest TDM ages (1499–2156 Ma), clearly greater than the TDM ages that characterize coeval sedimentary series of the Iberian Autochthonous Domain (1256–1334 Ma). This finding allows us to place Iberian Basal Allochthonous Units very close to the West Africa Craton, from where they received a dominant contribution of old crustal materials, whereas the Iberian Autochthonous Domain occupied a more eastern paleoposition closer to the Sahara Metacraton.
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spelling Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana marginIberian MassifSm-Nd isotope geochemistryEdiacaran-CambrianGondwana peleogeographyThe geochemical and isotopic (Sm-Nd) features of the Ediacaran-Cambrian siliciclastic series from the Central Iberian Zone and the Iberian Allochthonous Domains indicate a significant paleogeographic change at the northern margin of Gondwana, associated with the development of the Avalonian-Cadomian arc. During the Neoproterozoic, the opening of a peri-Gondwanan back-arc basin and its subsequent widening during the Cambrian led to a progressive separation of the sedimentary basins from the main focus of the probably waning Cadomian magmatic arc activity. This work presents a paleogeographic reconstruction of the distribution of the Iberian terranes along the North Gondwanan margin during Ediacaran and Cambrian times, based on the geochemical and Nd-isotope data from the Iberian Allochthonous and Autochthonous Domains. These results suggest a location close to the West Africa Craton for both the allochthonous and autochthonous terranes, but they would be distributed laterally along the northern margin of Gondwana, occupying arc- or continental-ward positions within a wide back-arc basin. In this context, the peri-Gondwanan volcanic arc acted as the main supplier of the abundant juvenile material, as reflected in positive values of εNd and young TDM model ages (720–1215 Ma) of the Middle Cambrian siliciclastic series from NW Iberia Upper Allochthonous Units. On the other hand, the rather equivalent geochemical and isotopic features of the sedimentary series of the NW and SW Iberia Basal Allochthonous Units suggest a common paleolocation for those series, yet within the back-arc basin ainland and older isotope sources. The sedimentary series of these terranes present the oldest TDM ages (1499–2156 Ma), clearly greater than the TDM ages that characterize coeval sedimentary series of the Iberian Autochthonous Domain (1256–1334 Ma). This finding allows us to place Iberian Basal Allochthonous Units very close to the West Africa Craton, from where they received a dominant contribution of old crustal materials, whereas the Iberian Autochthonous Domain occupied a more eastern paleoposition closer to the Sahara Metacraton.Elsevier2022-10-18T10:43:38Z2022-10-182020-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/32581http://hdl.handle.net/10174/32581https://doi.org/10.1016/j.earscirev.2019.103079engFuenlabrada, J.M., Arenas, R., Sánchez Martínez, S., Díez Fernández, R., Pieren, A.P., PEREIRA, M.F., Chichorro, M., Silva, J.B. (2020). Geochemical and isotopic (Sm-Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin. EARTH-SCIENCE REVIEWS 201, 103079.ndndndndndndndnd250Fuenlabrada, J.M.Arenas, R.Sanchez Martinez, S.Diez Fernandez, R.Pieren, A.P.Pereira, M.F.Chichorro, M.Silva, J.B.info: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:RCAAP2024-01-03T19:33:22Zoai:dspace.uevora.pt:10174/32581Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:21:31.751757Repositório 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 Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
title Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
spellingShingle Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
Fuenlabrada, J.M.
Iberian Massif
Sm-Nd isotope geochemistry
Ediacaran-Cambrian
Gondwana peleogeography
title_short Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
title_full Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
title_fullStr Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
title_full_unstemmed Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
title_sort Geochemical and isotopic (SmeNd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
author Fuenlabrada, J.M.
author_facet Fuenlabrada, J.M.
Arenas, R.
Sanchez Martinez, S.
Diez Fernandez, R.
Pieren, A.P.
Pereira, M.F.
Chichorro, M.
Silva, J.B.
author_role author
author2 Arenas, R.
Sanchez Martinez, S.
Diez Fernandez, R.
Pieren, A.P.
Pereira, M.F.
Chichorro, M.
Silva, J.B.
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Fuenlabrada, J.M.
Arenas, R.
Sanchez Martinez, S.
Diez Fernandez, R.
Pieren, A.P.
Pereira, M.F.
Chichorro, M.
Silva, J.B.
dc.subject.por.fl_str_mv Iberian Massif
Sm-Nd isotope geochemistry
Ediacaran-Cambrian
Gondwana peleogeography
topic Iberian Massif
Sm-Nd isotope geochemistry
Ediacaran-Cambrian
Gondwana peleogeography
description The geochemical and isotopic (Sm-Nd) features of the Ediacaran-Cambrian siliciclastic series from the Central Iberian Zone and the Iberian Allochthonous Domains indicate a significant paleogeographic change at the northern margin of Gondwana, associated with the development of the Avalonian-Cadomian arc. During the Neoproterozoic, the opening of a peri-Gondwanan back-arc basin and its subsequent widening during the Cambrian led to a progressive separation of the sedimentary basins from the main focus of the probably waning Cadomian magmatic arc activity. This work presents a paleogeographic reconstruction of the distribution of the Iberian terranes along the North Gondwanan margin during Ediacaran and Cambrian times, based on the geochemical and Nd-isotope data from the Iberian Allochthonous and Autochthonous Domains. These results suggest a location close to the West Africa Craton for both the allochthonous and autochthonous terranes, but they would be distributed laterally along the northern margin of Gondwana, occupying arc- or continental-ward positions within a wide back-arc basin. In this context, the peri-Gondwanan volcanic arc acted as the main supplier of the abundant juvenile material, as reflected in positive values of εNd and young TDM model ages (720–1215 Ma) of the Middle Cambrian siliciclastic series from NW Iberia Upper Allochthonous Units. On the other hand, the rather equivalent geochemical and isotopic features of the sedimentary series of the NW and SW Iberia Basal Allochthonous Units suggest a common paleolocation for those series, yet within the back-arc basin ainland and older isotope sources. The sedimentary series of these terranes present the oldest TDM ages (1499–2156 Ma), clearly greater than the TDM ages that characterize coeval sedimentary series of the Iberian Autochthonous Domain (1256–1334 Ma). This finding allows us to place Iberian Basal Allochthonous Units very close to the West Africa Craton, from where they received a dominant contribution of old crustal materials, whereas the Iberian Autochthonous Domain occupied a more eastern paleoposition closer to the Sahara Metacraton.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01T00:00:00Z
2022-10-18T10:43:38Z
2022-10-18
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/32581
http://hdl.handle.net/10174/32581
https://doi.org/10.1016/j.earscirev.2019.103079
url http://hdl.handle.net/10174/32581
https://doi.org/10.1016/j.earscirev.2019.103079
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Fuenlabrada, J.M., Arenas, R., Sánchez Martínez, S., Díez Fernández, R., Pieren, A.P., PEREIRA, M.F., Chichorro, M., Silva, J.B. (2020). Geochemical and isotopic (Sm-Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin. EARTH-SCIENCE REVIEWS 201, 103079.
nd
nd
nd
nd
nd
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nd
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250
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