Articulo
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
Registro en:
issn:1342-937X
Autor
Casquet, César
Pankhurst, Robert J.
Fanning, C. Mark
Baldo, Edgardo G.
Galindo, Carmen
Rapela, Carlos Washington
González Casado, J. M.
Dahlquist, Juan A.
Institución
Resumen
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. Facultad de Ciencias Naturales y Museo Centro de Investigaciones Geológicas