Time Lag between Metamorphism and Crystallization of Anatectic Granites (Cordoba, Argentina)

D'Eramo, Fernando J.; Esteban Guzmán, José Julián; Demartis, Manuel; Aragón, Eugenio; Coniglio, Jorge E.; Pinotti, Lucio P.

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Fecha

2020

Autor

D'Eramo, Fernando J.

Esteban Guzmán, José Julián

Demartis, Manuel

Aragón, Eugenio

Coniglio, Jorge E.

Pinotti, Lucio P.

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Estadisticas en RECOLECTA
(LA Referencia)

Geologica Acta 18 : (2020) // Article ID 18.17

URI

http://hdl.handle.net/10810/50772

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

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