Time Lag between Metamorphism and Crystallization of Anatectic Granites (Cordoba, Argentina)
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Date
2020Author
D'Eramo, Fernando J.
Esteban Guzmán, José Julián
Demartis, Manuel
Aragón, Eugenio
Coniglio, Jorge E.
Pinotti, Lucio P.
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Geologica Acta 18 : (2020) // Article ID 18.17
Abstract
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