Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

ABSTRACT Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44° 30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén...

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Autores principales:	Quezada,Paulo, Hervé,Francisco, Calderón,Mauricio, Fanning,Mark, Pankhurst,Robert, Godoy,Estanislao, Urbina,Octavio, Suárez,Rodrigo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2021
Materias:	Traiguén Formation Liquiñe-Ofqui Fault Zone
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000100054
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spelling	oai:scielo:S0718-710620210001000542021-02-11Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, ChileQuezada,PauloHervé,FranciscoCalderón,MauricioFanning,MarkPankhurst,RobertGodoy,EstanislaoUrbina,OctavioSuárez,Rodrigo Traiguén Formation Liquiñe-Ofqui Fault Zone ABSTRACT Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44° 30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén Formation; previous correlation with the Paleozoic metamorphic basement of this sector of the North Patagonian Andes is thus refuted. A similar age and provenance were obtained for a paraconglomerate bed of the La Junta Formation ca. 80 km to the north, which is thought to represent a high-energy lateral facies variation of the Traiguén Formation. Miocene plutonic rocks of the North Patagonian Batholith intruded these metasedimentary rocks, generating a contact metamorphic aureole that reaches biotite grade and overprints a previous metamorphic fabric probably formed during closure of the Traiguén Basin. Similar young ages for metamorphic rocks located immediately west of the Liquiñe-Ofqui Fault Zone 300 km north, near Ayacara, suggest a regional pattern of earliest Neogene metamorphism and rapid exhumation in this segment of the Patagonian Andes.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.48 n.1 20212021-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000100054en10.5027/andgeov48n1-3282
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Traiguén Formation Liquiñe-Ofqui Fault Zone
spellingShingle	Traiguén Formation Liquiñe-Ofqui Fault Zone Quezada,Paulo Hervé,Francisco Calderón,Mauricio Fanning,Mark Pankhurst,Robert Godoy,Estanislao Urbina,Octavio Suárez,Rodrigo Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
description	ABSTRACT Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44° 30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén Formation; previous correlation with the Paleozoic metamorphic basement of this sector of the North Patagonian Andes is thus refuted. A similar age and provenance were obtained for a paraconglomerate bed of the La Junta Formation ca. 80 km to the north, which is thought to represent a high-energy lateral facies variation of the Traiguén Formation. Miocene plutonic rocks of the North Patagonian Batholith intruded these metasedimentary rocks, generating a contact metamorphic aureole that reaches biotite grade and overprints a previous metamorphic fabric probably formed during closure of the Traiguén Basin. Similar young ages for metamorphic rocks located immediately west of the Liquiñe-Ofqui Fault Zone 300 km north, near Ayacara, suggest a regional pattern of earliest Neogene metamorphism and rapid exhumation in this segment of the Patagonian Andes.
author	Quezada,Paulo Hervé,Francisco Calderón,Mauricio Fanning,Mark Pankhurst,Robert Godoy,Estanislao Urbina,Octavio Suárez,Rodrigo
author_facet	Quezada,Paulo Hervé,Francisco Calderón,Mauricio Fanning,Mark Pankhurst,Robert Godoy,Estanislao Urbina,Octavio Suárez,Rodrigo
author_sort	Quezada,Paulo
title	Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
title_short	Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
title_full	Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
title_fullStr	Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
title_full_unstemmed	Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile
title_sort	mid-cenozoic shrimp u-pb detrital zircon ages from metasedimentary rocks in the north patagonian andes of aysén, chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062021000100054
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Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

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