Late Cambrian magmatic arc activity in peri-Gondwana

The North African section of the Gondwana margin was the site of voluminous, arc-related magmatism during the Late Neoproterozoic (Avalonian-Cadomian orogen). The lower (and older) metasedimentary sequence that constitutes the Basal Units of the llochthonous Complexes of NW Iberia was deposited in t...

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Autores: Andonaegui Moreno, Pilar, Abati Gómez, Jacobo, Diez Fernández, Rubén
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:184719
Acceso en línea:https://ddd.uab.cat/record/184719
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2017.15.4.4
Access Level:acceso abierto
Palabra clave:Convergent margin
Subduction
Magmatism
Whole rock geochemistry
NW Iberian Massif
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spelling Late Cambrian magmatic arc activity in peri-Gondwanageochemical evidence from metagranitoid rocks of the Basal Allochthonous Units of NW IberiaAndonaegui Moreno, PilarAbati Gómez, JacoboDiez Fernández, RubénConvergent marginSubductionMagmatismWhole rock geochemistryNW Iberian MassifThe North African section of the Gondwana margin was the site of voluminous, arc-related magmatism during the Late Neoproterozoic (Avalonian-Cadomian orogen). The lower (and older) metasedimentary sequence that constitutes the Basal Units of the llochthonous Complexes of NW Iberia was deposited in that setting. In these units, sedimentation was followed by the intrusion of tonalites and granodiorites in the late Cambrian (ca. 493-489Ma). In the Late Paleozoic, the collision of Gondwana and Laurussia (Variscan orogeny) deformed and metamorphosed the whole ensemble. New whole rock geochemical analysis performed in seven samples of metatonalites and fourteen samples of metagranodiorites are characterized by: i) slight enrichment in incompatible elements (Rb, Ba, Th, U), ii) negative anomalies in Nb, Ta, P, and Ti, and iii) negative anomalies in Eu. These chemical features are in agreement with a subduction-related setting for the genesis of both types of magma, which is also supported by chemical discrimination using tectonic setting diagrams. Positive anomalies of Pb suggest a crustal component. The new geochemical data reveal that the convergent orogen that ruled the paleogeography of the Gondwana periphery during the Neoproterozoic (Cadomian orogen) remained active beyond the Neoproterozoic-Cambrian transition, up to at least late Cambrian times. 22017-01-0120172017-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/184719https://dx.doi.org/urn:doi:10.1344/GeologicaActa2017.15.4.4reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1847192026-06-06T12:50:31Z
dc.title.none.fl_str_mv Late Cambrian magmatic arc activity in peri-Gondwana
geochemical evidence from metagranitoid rocks of the Basal Allochthonous Units of NW Iberia
title Late Cambrian magmatic arc activity in peri-Gondwana
spellingShingle Late Cambrian magmatic arc activity in peri-Gondwana
Andonaegui Moreno, Pilar
Convergent margin
Subduction
Magmatism
Whole rock geochemistry
NW Iberian Massif
title_short Late Cambrian magmatic arc activity in peri-Gondwana
title_full Late Cambrian magmatic arc activity in peri-Gondwana
title_fullStr Late Cambrian magmatic arc activity in peri-Gondwana
title_full_unstemmed Late Cambrian magmatic arc activity in peri-Gondwana
title_sort Late Cambrian magmatic arc activity in peri-Gondwana
dc.creator.none.fl_str_mv Andonaegui Moreno, Pilar
Abati Gómez, Jacobo
Diez Fernández, Rubén
author Andonaegui Moreno, Pilar
author_facet Andonaegui Moreno, Pilar
Abati Gómez, Jacobo
Diez Fernández, Rubén
author_role author
author2 Abati Gómez, Jacobo
Diez Fernández, Rubén
author2_role author
author
dc.subject.none.fl_str_mv Convergent margin
Subduction
Magmatism
Whole rock geochemistry
NW Iberian Massif
topic Convergent margin
Subduction
Magmatism
Whole rock geochemistry
NW Iberian Massif
description The North African section of the Gondwana margin was the site of voluminous, arc-related magmatism during the Late Neoproterozoic (Avalonian-Cadomian orogen). The lower (and older) metasedimentary sequence that constitutes the Basal Units of the llochthonous Complexes of NW Iberia was deposited in that setting. In these units, sedimentation was followed by the intrusion of tonalites and granodiorites in the late Cambrian (ca. 493-489Ma). In the Late Paleozoic, the collision of Gondwana and Laurussia (Variscan orogeny) deformed and metamorphosed the whole ensemble. New whole rock geochemical analysis performed in seven samples of metatonalites and fourteen samples of metagranodiorites are characterized by: i) slight enrichment in incompatible elements (Rb, Ba, Th, U), ii) negative anomalies in Nb, Ta, P, and Ti, and iii) negative anomalies in Eu. These chemical features are in agreement with a subduction-related setting for the genesis of both types of magma, which is also supported by chemical discrimination using tectonic setting diagrams. Positive anomalies of Pb suggest a crustal component. The new geochemical data reveal that the convergent orogen that ruled the paleogeography of the Gondwana periphery during the Neoproterozoic (Cadomian orogen) remained active beyond the Neoproterozoic-Cambrian transition, up to at least late Cambrian times.
publishDate 2017
dc.date.none.fl_str_mv 2
2017-01-01
2017
2017-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/184719
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2017.15.4.4
url https://ddd.uab.cat/record/184719
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2017.15.4.4
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
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eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
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