Datación Sm-Nd del metamorfismo en la Sierra de las Imanas (Sierras Pampeanas Occidentales, Argentina)

• Autores: Edgardo G. Baldo, Carlos Washington Rapela, Carmen Galindo Francisco, César Casquet Martín, Robert John Pankhurst, Juan A. Murra, J. Dahiquist
• Localización: Geogaceta, ISSN 0213-683X, Nº. 35, 2003, págs. 75-78
• Idioma: español
• Enlaces
  • Texto completo
• Resumen

  • 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.