info:eu-repo/semantics/article
Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)
Fecha
2020-11Registro en:
D'eramo, Fabiana; Esteban, J. J.; Coniglio, Jorge Enrique; Demartis, Manuel; Aragón, Luis Enrique; et al.; Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina); Universidad de Barcelona; Geologica Acta; 18; 17; 11-2020; 1-14
1695-6133
1696-5728
CONICET Digital
CONICET
Autor
D'eramo, Fabiana
Esteban, J. J.
Coniglio, Jorge Enrique
Demartis, Manuel
Aragón, Luis Enrique
Pinotti, Lucio Pedro
Resumen
SHRIMP and LA-ICP-MS analyses carried out on zircons from the Río de los Sauces granite revealed their metamorphic and igneous nature. The metamorphic zircons yielded an age of 537±4.8 (2σ)Ma that probably predates the onset of the anatexis during the Pampean orogeny. By contrast, the igneous zircons yielded a younger age of 529±6 (2σ)Ma and reflected its crystallization age. These data point to a short time lag of ca. 8Myr between the High Temperature (HT) metamorphic peak and the subsequent crystallization age of the granite. Concordia age of 534±3.8 (2σ)Ma, for both types of zircon populations, can be considered as the mean age of the Pampean HT metamorphism in the Sierras de Córdoba.