OF EARLY TERTIARY BACK-ARC BASALTS FROM AYSEN , SOUTHERN CHILE ( 44-46 O S ) : GEODYNAMIC IMPLICATIONS

( l ) Laboratoire de Petrologie Magmatique, CNRS URA 1277 et FU 17, CEREGE, BP 80, Aix-en-Provence Cedex 04, France (2) Departamento de Geologia, Universidad de Chile, Casilla 135 18, Correo 2 1, Santiago, Chile '3' British Antarctic Survey, c10 NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, U.K. '4) Sernageomin, Casilla 10465, Correo 09, Avenida Santa Maria 0104, Santiago, Chile

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