Linkages between the southern Patagonia Pre-Permian basements

The Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized mainly by quartz-muscovite-chlorite schists; the metamorphic grade reaches greenschist fa...

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Detalles Bibliográficos
Autores: Permuy Vidal, C., Moreira, P., Guido, D. M., Fanning, C. M.
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:119011
Acceso en línea:https://ddd.uab.cat/record/119011
https://dx.doi.org/urn:doi:10.1344/105.000002082
Access Level:acceso abierto
Palabra clave:Patagonia
Deseado Massif
Basement
U-Pb SHRIMP
Cerro Negro
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spelling Linkages between the southern Patagonia Pre-Permian basementsnew insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro DistrictPermuy Vidal, C.Moreira, P.Guido, D. M.Fanning, C. M.PatagoniaDeseado MassifBasementU-Pb SHRIMPCerro NegroThe Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized mainly by quartz-muscovite-chlorite schists; the metamorphic grade reaches greenschist facies (biotite-garnet grade) with a regional S1 schistosity subparallel to the original sedimentary structure S0 and a secondary non-penetrative S2 foliation. New detrital zircon U-Pb geochronology shows that maximum depositional ages for detrital zircons are Devonian, ages of 379 ± 4Ma. These results suggest that the Cerro Negro basement rocks are the youngest basement in the Deseado Massif, overlapping some detrital zircon ages in the eastern Andean Metamorphic Complex in the Andean region. Most of detrital zircons are igneous in origin with a major peak around ~396Ma, provably sourced from the Devonian granitoids of the Río Deseado Complex (El Laurel and Bahía Laura granites) and equivalent northern Patagonia granitoids (e.g. Colan Conhué and Lago Lolog granites). Secondary peaks correspond to Ordovician to Silurian ages, being the Río Deseado Complex and La Modesta Formation (and their igneous contributors) the possible sources of the zircons. The minor oldest peaks yield Cambrian-Neoproterozoic; Mesoproterozoic and Paleoproterozoic-Archean ages, evidencing a common source from the interior of Gondwana. The results provide new insights about the relationships between the pre-Permian metasedimentary rocks of the extra-Andean and Andean region during Mid-Paleozoic ages. 22014-01-0120142014-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/119011https://dx.doi.org/urn:doi:10.1344/105.000002082reponame: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/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1190112026-06-06T12:50:31Z
dc.title.none.fl_str_mv Linkages between the southern Patagonia Pre-Permian basements
new insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title Linkages between the southern Patagonia Pre-Permian basements
spellingShingle Linkages between the southern Patagonia Pre-Permian basements
Permuy Vidal, C.
Patagonia
Deseado Massif
Basement
U-Pb SHRIMP
Cerro Negro
title_short Linkages between the southern Patagonia Pre-Permian basements
title_full Linkages between the southern Patagonia Pre-Permian basements
title_fullStr Linkages between the southern Patagonia Pre-Permian basements
title_full_unstemmed Linkages between the southern Patagonia Pre-Permian basements
title_sort Linkages between the southern Patagonia Pre-Permian basements
dc.creator.none.fl_str_mv Permuy Vidal, C.
Moreira, P.
Guido, D. M.
Fanning, C. M.
author Permuy Vidal, C.
author_facet Permuy Vidal, C.
Moreira, P.
Guido, D. M.
Fanning, C. M.
author_role author
author2 Moreira, P.
Guido, D. M.
Fanning, C. M.
author2_role author
author
author
dc.subject.none.fl_str_mv Patagonia
Deseado Massif
Basement
U-Pb SHRIMP
Cerro Negro
topic Patagonia
Deseado Massif
Basement
U-Pb SHRIMP
Cerro Negro
description The Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized mainly by quartz-muscovite-chlorite schists; the metamorphic grade reaches greenschist facies (biotite-garnet grade) with a regional S1 schistosity subparallel to the original sedimentary structure S0 and a secondary non-penetrative S2 foliation. New detrital zircon U-Pb geochronology shows that maximum depositional ages for detrital zircons are Devonian, ages of 379 ± 4Ma. These results suggest that the Cerro Negro basement rocks are the youngest basement in the Deseado Massif, overlapping some detrital zircon ages in the eastern Andean Metamorphic Complex in the Andean region. Most of detrital zircons are igneous in origin with a major peak around ~396Ma, provably sourced from the Devonian granitoids of the Río Deseado Complex (El Laurel and Bahía Laura granites) and equivalent northern Patagonia granitoids (e.g. Colan Conhué and Lago Lolog granites). Secondary peaks correspond to Ordovician to Silurian ages, being the Río Deseado Complex and La Modesta Formation (and their igneous contributors) the possible sources of the zircons. The minor oldest peaks yield Cambrian-Neoproterozoic; Mesoproterozoic and Paleoproterozoic-Archean ages, evidencing a common source from the interior of Gondwana. The results provide new insights about the relationships between the pre-Permian metasedimentary rocks of the extra-Andean and Andean region during Mid-Paleozoic ages.
publishDate 2014
dc.date.none.fl_str_mv 2
2014-01-01
2014
2014-01-01
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/119011
https://dx.doi.org/urn:doi:10.1344/105.000002082
url https://ddd.uab.cat/record/119011
https://dx.doi.org/urn:doi:10.1344/105.000002082
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/3.0/
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
https://creativecommons.org/licenses/by-sa/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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
collection Dipòsit Digital de Documents de la UAB
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