Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District

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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Autores principales: Permuy Vidal, Conrado, Moreira, Pilar, Guido, Diego Martín, Fanning, C. M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Naturales
Basement
Deseado Massif
Detrital zircon
Patagonia
U-Pb SHRIMP
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85204
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85204
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Basement
Deseado Massif
Detrital zircon
Patagonia
U-Pb SHRIMP
spellingShingle Ciencias Naturales
Basement
Deseado Massif
Detrital zircon
Patagonia
U-Pb SHRIMP
Permuy Vidal, Conrado
Moreira, Pilar
Guido, Diego Martín
Fanning, C. M.
Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
topic_facet Ciencias Naturales
Basement
Deseado Massif
Detrital zircon
Patagonia
U-Pb SHRIMP
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 nonpenetrative 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, probably 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.
format Articulo
Articulo
author Permuy Vidal, Conrado
Moreira, Pilar
Guido, Diego Martín
Fanning, C. M.
author_facet Permuy Vidal, Conrado
Moreira, Pilar
Guido, Diego Martín
Fanning, C. M.
author_sort Permuy Vidal, Conrado
title Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title_short Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title_full Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title_fullStr Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title_full_unstemmed Linkages between the southern Patagonia Pre-Permian basements: New insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
title_sort linkages between the southern patagonia pre-permian basements: new insights from detrital zircons u-pb shrimp ages from the cerro negro district
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85204
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