Time lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)
- D´Eramo, F.J.
- Esteban, J.J.
- Demartis, M.
- Aragón, E.
- Coniglio, J.E.
- Pinotti, L.P.
ISSN: 1695-6133
Año de publicación: 2020
Volumen: 18
Número: 1
Tipo: Artículo
Otras publicaciones en: Geologica acta: an international earth science journal
Resumen
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.
Información de financiación
This work has been supported by grants PICT1754/16, PIP688 CONICET, GIU17/033 of “Grupos de Investigación” of the University of the Basque Country, and CGL2017–82976-P (Ministerio de Economía, Industria y Competitividad/Agencia Estatal de Investigación/Fondo Europeo de Desarrollo Regional, European Union). We thank Gloria Gallastegui and an anonymous reviewer for their very constructive suggestions that significantly improved the manuscript.Financiadores
- European Commission European Union
-
Euskal Herriko Unibertsitatea
Spain
- CGL2017–82976-P
- European Regional Development Fund European Union