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


  • F.J. D´Eramo Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA) CONICET-UNRC Ruta Nac. nº 36 km 601, Río Cuarto, Argentina. Universidad Nacional de Río Cuarto, Departamento de Geología Ruta Nac. n° 36 km 601, Río Cuarto, Argentina.
  • J.J. Esteban Departamento de Geología, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU Apartado 644, 48080 Bilbao, Spain.
  • M. Demartis Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA) CONICET-UNRC Ruta Nac. nº 36 km 601, Río Cuarto, Argentina. Universidad Nacional de Río Cuarto, Departamento de Geología Ruta Nac. n° 36 km 601, Río Cuarto, Argentina.
  • E. Aragón Universidad Nacional de la Plata, CIG-CONICET Diagonal 113 64, 1900. La Plata, Argentina.
  • J.E. Coniglio Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA) CONICET-UNRC Ruta Nac. nº 36 km 601, Río Cuarto, Argentina. Universidad Nacional de Río Cuarto, Departamento de Geología Ruta Nac. n° 36 km 601, Río Cuarto, Argentina.
  • L.P. Pinotti Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente (ICBIA) CONICET-UNRC Ruta Nac. nº 36 km 601, Río Cuarto, Argentina. Universidad Nacional de Río Cuarto, Departamento de Geología Ruta Nac. n° 36 km 601, Río Cuarto, Argentina.




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


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.


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