Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints
Autor(a) principal: | |
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Data de Publicação: | 2017 |
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/10174/22494 https://doi.org/10.1344/GeologicaActa2017.15.4.10 |
Resumo: | The Santa Eulália-Monforte massif is a post-kinematic late Carboniferous-early Permian (LC-EP) located in the Ossa-Morena Zone (Portugal). This paper examines field relationships between calc-alkaline pinkish granites and mafic-intermediate rocks from the external ring of this composite massif and presents new U-Pb zircon age determinations. The estimated 206Pb/238U ages of 297.4 ± 4.2 Ma for a sample of the calc-alkaline pinkish granite and of 303.1 ± 3.1 Ma for a sample of gabbro-diorite, point to a short time interval between the crystallization of both magmas, with the mafic and intermediate rocks being the oldest ones. At the outcrop scale, contacts of the mafic-intermediate rocks with the host pinkish granite are sharp and corroborate this age relationship, but do not justify why the host-enclave contacts often have curved and irregular shapes, indicative of liquid-liquid interaction. A full analysis of the distribution of U-Pb zircon ages and respective Th/U ratios seems to be possible to admit that the distinct compositionally magmas were roughly contemporaneous. The ages obtained are also important because they fit the LC-EP Iberian calc-alkaline suite formed within the time interval in which the Iberian-Armorican Arc was formed, developed and took place the subduction of the Paleotethyan oceanic plate under the Eurasian active margin. Taking this geodynamic setting as reference, the LC-EP Iberian calc-alkaline magmatism can be interpreted as most probably related to the Cimmerian cycle instead of the traditionally accepted model that ascribe a closer connection with the Variscan cycle. |
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Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraintsIberian MassifLate Carboniferous-Early PermianCalc-alkaline bimodal plutonismZircon datingVariscan and Cimmerian cyclesThe Santa Eulália-Monforte massif is a post-kinematic late Carboniferous-early Permian (LC-EP) located in the Ossa-Morena Zone (Portugal). This paper examines field relationships between calc-alkaline pinkish granites and mafic-intermediate rocks from the external ring of this composite massif and presents new U-Pb zircon age determinations. The estimated 206Pb/238U ages of 297.4 ± 4.2 Ma for a sample of the calc-alkaline pinkish granite and of 303.1 ± 3.1 Ma for a sample of gabbro-diorite, point to a short time interval between the crystallization of both magmas, with the mafic and intermediate rocks being the oldest ones. At the outcrop scale, contacts of the mafic-intermediate rocks with the host pinkish granite are sharp and corroborate this age relationship, but do not justify why the host-enclave contacts often have curved and irregular shapes, indicative of liquid-liquid interaction. A full analysis of the distribution of U-Pb zircon ages and respective Th/U ratios seems to be possible to admit that the distinct compositionally magmas were roughly contemporaneous. The ages obtained are also important because they fit the LC-EP Iberian calc-alkaline suite formed within the time interval in which the Iberian-Armorican Arc was formed, developed and took place the subduction of the Paleotethyan oceanic plate under the Eurasian active margin. Taking this geodynamic setting as reference, the LC-EP Iberian calc-alkaline magmatism can be interpreted as most probably related to the Cimmerian cycle instead of the traditionally accepted model that ascribe a closer connection with the Variscan cycle.UB-ICTJA-IDAEA-UAB2018-02-26T17:51:49Z2018-02-262017-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/22494http://hdl.handle.net/10174/22494https://doi.org/10.1344/GeologicaActa2017.15.4.10engPereira, M.F., Gama, C., Rodriguez, C. (2017). Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints. Geologica Acta 15 (4): 409-428.mpereira@uevora.ptndnd250Pereira, Manuel FranciscoGama, CristinaRodriguez, Carmeninfo: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:RCAAP2024-01-03T19:13:56Zoai:dspace.uevora.pt:10174/22494Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:13:34.667551Repositório 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 |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
title |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
spellingShingle |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints Pereira, Manuel Francisco Iberian Massif Late Carboniferous-Early Permian Calc-alkaline bimodal plutonism Zircon dating Variscan and Cimmerian cycles |
title_short |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
title_full |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
title_fullStr |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
title_full_unstemmed |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
title_sort |
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints |
author |
Pereira, Manuel Francisco |
author_facet |
Pereira, Manuel Francisco Gama, Cristina Rodriguez, Carmen |
author_role |
author |
author2 |
Gama, Cristina Rodriguez, Carmen |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Pereira, Manuel Francisco Gama, Cristina Rodriguez, Carmen |
dc.subject.por.fl_str_mv |
Iberian Massif Late Carboniferous-Early Permian Calc-alkaline bimodal plutonism Zircon dating Variscan and Cimmerian cycles |
topic |
Iberian Massif Late Carboniferous-Early Permian Calc-alkaline bimodal plutonism Zircon dating Variscan and Cimmerian cycles |
description |
The Santa Eulália-Monforte massif is a post-kinematic late Carboniferous-early Permian (LC-EP) located in the Ossa-Morena Zone (Portugal). This paper examines field relationships between calc-alkaline pinkish granites and mafic-intermediate rocks from the external ring of this composite massif and presents new U-Pb zircon age determinations. The estimated 206Pb/238U ages of 297.4 ± 4.2 Ma for a sample of the calc-alkaline pinkish granite and of 303.1 ± 3.1 Ma for a sample of gabbro-diorite, point to a short time interval between the crystallization of both magmas, with the mafic and intermediate rocks being the oldest ones. At the outcrop scale, contacts of the mafic-intermediate rocks with the host pinkish granite are sharp and corroborate this age relationship, but do not justify why the host-enclave contacts often have curved and irregular shapes, indicative of liquid-liquid interaction. A full analysis of the distribution of U-Pb zircon ages and respective Th/U ratios seems to be possible to admit that the distinct compositionally magmas were roughly contemporaneous. The ages obtained are also important because they fit the LC-EP Iberian calc-alkaline suite formed within the time interval in which the Iberian-Armorican Arc was formed, developed and took place the subduction of the Paleotethyan oceanic plate under the Eurasian active margin. Taking this geodynamic setting as reference, the LC-EP Iberian calc-alkaline magmatism can be interpreted as most probably related to the Cimmerian cycle instead of the traditionally accepted model that ascribe a closer connection with the Variscan cycle. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01T00:00:00Z 2018-02-26T17:51:49Z 2018-02-26 |
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/10174/22494 http://hdl.handle.net/10174/22494 https://doi.org/10.1344/GeologicaActa2017.15.4.10 |
url |
http://hdl.handle.net/10174/22494 https://doi.org/10.1344/GeologicaActa2017.15.4.10 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Pereira, M.F., Gama, C., Rodriguez, C. (2017). Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints. Geologica Acta 15 (4): 409-428. mpereira@uevora.pt nd nd 250 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
UB-ICTJA-IDAEA-UAB |
publisher.none.fl_str_mv |
UB-ICTJA-IDAEA-UAB |
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 |
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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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1799136617777070080 |