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

1. Baldo, Edgardo G.
2. Rapela, Carlos Washington
3. Galindo Francisco, Carmen
4. Casquet Martín, César
5. Pankhurst, Robert John
6. Murra, Juan A.
7. Dahiquist, J.

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Otras publicaciones en: Geogaceta

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.

Fuente de los datos: Dialnet