Edgardo G. Baldo, Carlos Washington Rapela, Carmen Galindo Francisco, César Casquet Martín, Robert John Pankhurst, Juan A. Murra, J. Dahiquist
Sm-Nd garnet geochronology of a migmatite gneiss from the Sierra de las Imanas (Western Sierras Pampeanas) has provided a peak metamorphic age of 464.6 ± 4.5 Ma, i.e., Middle Ordovician, corresponding to the Famatinian orogeny of Western Argentina This age agrees with metamorphic ages obtained in nearby areas by U-Pb SHRIMP dating of zircon overgrowths. This coincidence confirms the reliability of the SmNd garnet chronometer in the study of metamorphic terranes. A Proterozoic TDM age of 1628 Ma suggests the involvement of an old recycled crustal component in the sedimentary protolith of the migmatite.
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