IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Evolución del magmatismo de arco durante el Eoceno medio-Mioceno temprano en los Andes Patagónicos
Autor/es:
VICTOR VALENCIA; ALFONSO ENCINAS; VANESA LITVAK; ANDRES FOLGUERA; SOFÍA IANNELLI; FLORENCIA BECHIS; VERONICA OLIVEROS; ANDRES ECHAURREN; LUCIA FERNÁNDEZ PAZ
Reunión:
Congreso; XX Congreso Geologico Argentino; 2017
Resumen:
El Maiten Belt represents arc activity from middle Eocene to lower Miocene times, after a stage of arc waning and within plate magmatism. Its evolution was controlled by changes in subduction zone geometry as well as changes in convergence rates. Arc resumption by middle Eocene is characterized by a tholeiitic volcanism, which evolved to typically calc-alkaline series during Oligocene time. However, its final stage of basic lava flows took place in association with marine transgressions and alkaline intrusions. Geochemically, these lavas show arc signature with N-MORB sources, wich contrasts with alkaline sills that represent deeper sources.