U–Pb SHRIMP zircon dating of Grenvillian metamorphism in Western Sierras Pampeanas (Argentina): Correlation with the Arequipa-Antofalla craton and constraints on the extent of the Precordillera Terrane

Metamorphism of Grenvillian age (ca. 1.2 Ga; U–Pb zircon dating) is recognized for the first time in the Western Sierras Pampeanas (Sierra de Maz). Conditions reached granulite facies (ca. 780 °C and ca. 780 MPa). Comparing geochronological and petrological characteristics with other outcrops of Mes...

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Detalles Bibliográficos
Autores: Casquet, César, Pankhurst, Robert J., Fanning, C. Mark, Baldo, Edgardo G., Galindo, Carmen, Rapela, Carlos Washington, González Casado, J. M., Dahlquist, Juan A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/128878
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128878
Access Level:acceso abierto
Palabra clave:Ciencias Naturales
Geología
Sierras Pampeanas
Argentina
Metamorphism
U–Pb SHRIMP zircon dating
Grenville
Descripción
Sumario:Metamorphism of Grenvillian age (ca. 1.2 Ga; U–Pb zircon dating) is recognized for the first time in the Western Sierras Pampeanas (Sierra de Maz). Conditions reached granulite facies (ca. 780 °C and ca. 780 MPa). Comparing geochronological and petrological characteristics with other outcrops of Mesoproterozoic basement, particularly in the northern and central Arequipa-Antofalla craton, we suggest that these regions were part of a single continental crustal block from Mesoproterozoic times, and thus autochthonous or parautochthonous to Gondwana.

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