Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)

F.J. D´Eramo, J.J. Esteban, M. Demartis, E. Aragón, J.E. Coniglio, L.P. Pinotti


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.


Pampean Orogeny; Pampean Metamorphism; Rio de Los Sauces granite; U-Pb SHRIMP dating; LA-ICP-MS analyses.

Full Text:


DOI: https://doi.org/10.1344/GeologicaActa2020.18.17


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike License.

            Facultat de Ciències de la Terra                       Geociències Barcelona                           Institut de Diagnosi Ambiental                    Universitat Autònoma de Barcelona           
                Universitat de Barcelona                                                                                          i Estudis de l'Aigua (CSIC) 
Geologica Acta (ISSN-1695-6133)
Biblioteca de Ciències de la Terra (UB-CSIC) | Facultat de Ciències de la Terra, Martí i Franquès s/n 08028 Barcelona | Spain
Phone: +34 93 403 19 89 | E-mail: geologica-acta@ictja.csic.es
RCUB RCUB Declaració ètica Avís Legal Centre de Recursos per a l'Aprenentatge i la Investigació Universitat de Barcelona