Open AccessTime lag between metamorphism and crystallization of anatectic granites (Córdoba, Argentina)
Author(s) -
Fernando J. D ́Eramo,
José Julián Esteban,
Manuel Demartis,
Eugenio Aragón,
Jorge E. Coniglio
Publication year - 2020
Publication title -
geologica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 45
eISSN - 1696-5728
pISSN - 1695-6133
DOI - 10.1344/geologicaacta2020.18.17
Subject(s) - metamorphism , metamorphic rock , zircon , geology , anatexis , geochemistry , igneous rock , orogeny , partial melting , geomorphology , crust , structural basin
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.