Time Lag between Metamorphism and Crystallization of Anatectic Granites (Cordoba, Argentina)
Fecha
2020Autor
D'Eramo, Fernando J.
Esteban Guzmán, José Julián
Demartis, Manuel
Aragón, Eugenio
Coniglio, Jorge E.
Pinotti, Lucio P.
Metadatos
Mostrar el registro completo del ítem
Geologica Acta 18 : (2020) // Article ID 18.17
Resumen
SHRIMP and LA-ICP-MS analyses carried out on zircons from the Rio de los Sauces granite revealed their metamorphic and igneous nature. The metamorphic zircons yielded an age of 537 +/- 4.8 (2s)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 (2s)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 (2s)Ma, for both types of zircon populations, can be considered as the mean age of the Pampean HT metamorphism in the Sierras de Cordoba