The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?

New U-Pb and 40Ar/39Ar age data from deformed and undeformed granitoids of the North Patagonian Massif establish the presence of Early Cambrian and widespread Ordovician magmatism in northern Patagonia. These data suggest that the Pampean (Cambrian) and Famatinian (Ordovician) magmatic belts of the...

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Detalles Bibliográficos
Autor principal: Rapalini, Augusto Ernesto
Publicado: 2013
Materias:
ancestry
argon-argon dating
autochthon
Cambrian
geochronology
metasedimentary rock
Ordovician
SHRIMP dating
uranium-lead dating
zircon
Patagonia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09544879_v25_n4_p337_Rapalini
http://hdl.handle.net/20.500.12110/paper_09544879_v25_n4_p337_Rapalini
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09544879_v25_n4_p337_Rapalini
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spelling paper:paper_09544879_v25_n4_p337_Rapalini2025-07-30T18:32:05Z The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin? Rapalini, Augusto Ernesto ancestry argon-argon dating autochthon Cambrian geochronology metasedimentary rock Ordovician SHRIMP dating uranium-lead dating zircon Patagonia New U-Pb and 40Ar/39Ar age data from deformed and undeformed granitoids of the North Patagonian Massif establish the presence of Early Cambrian and widespread Ordovician magmatism in northern Patagonia. These data suggest that the Pampean (Cambrian) and Famatinian (Ordovician) magmatic belts of the Sierras Pampeanas are continuous into Patagonia. SHRIMP U-Pb age spectra from detrital zircons of Cambro-Ordovician metasedimentary rocks show patterns very similar to those from equivalent units of the Pampia block, over 500 km farther north. These results suggest that the North Patagonian Massif was likely part of the South American margin of Gondwana in the early Palaeozoic and strongly argue in favour of an authochtonous or para-autochthonous origin for this block. © 2013 John Wiley & Sons Ltd. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09544879_v25_n4_p337_Rapalini http://hdl.handle.net/20.500.12110/paper_09544879_v25_n4_p337_Rapalini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic ancestry
argon-argon dating
autochthon
Cambrian
geochronology
metasedimentary rock
Ordovician
SHRIMP dating
uranium-lead dating
zircon
Patagonia
spellingShingle ancestry
argon-argon dating
autochthon
Cambrian
geochronology
metasedimentary rock
Ordovician
SHRIMP dating
uranium-lead dating
zircon
Patagonia
Rapalini, Augusto Ernesto
The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
topic_facet ancestry
argon-argon dating
autochthon
Cambrian
geochronology
metasedimentary rock
Ordovician
SHRIMP dating
uranium-lead dating
zircon
Patagonia
description New U-Pb and 40Ar/39Ar age data from deformed and undeformed granitoids of the North Patagonian Massif establish the presence of Early Cambrian and widespread Ordovician magmatism in northern Patagonia. These data suggest that the Pampean (Cambrian) and Famatinian (Ordovician) magmatic belts of the Sierras Pampeanas are continuous into Patagonia. SHRIMP U-Pb age spectra from detrital zircons of Cambro-Ordovician metasedimentary rocks show patterns very similar to those from equivalent units of the Pampia block, over 500 km farther north. These results suggest that the North Patagonian Massif was likely part of the South American margin of Gondwana in the early Palaeozoic and strongly argue in favour of an authochtonous or para-autochthonous origin for this block. © 2013 John Wiley & Sons Ltd.
author Rapalini, Augusto Ernesto
author_facet Rapalini, Augusto Ernesto
author_sort Rapalini, Augusto Ernesto
title The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
title_short The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
title_full The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
title_fullStr The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
title_full_unstemmed The South American ancestry of the North Patagonian Massif: Geochronological evidence for an autochthonous origin?
title_sort south american ancestry of the north patagonian massif: geochronological evidence for an autochthonous origin?
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09544879_v25_n4_p337_Rapalini
http://hdl.handle.net/20.500.12110/paper_09544879_v25_n4_p337_Rapalini
work_keys_str_mv AT rapaliniaugustoernesto thesouthamericanancestryofthenorthpatagonianmassifgeochronologicalevidenceforanautochthonousorigin
AT rapaliniaugustoernesto southamericanancestryofthenorthpatagonianmassifgeochronologicalevidenceforanautochthonousorigin
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