Assimilation of sialic crustal material by volcanics of the easternmost extension of the Trans-Mexican Volcanic Belt Evidence from Sr and Nd isotopes
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Las rocas volcánicas basálticas hasta riolíticas, de edad Plioceno al Cuaternario, provenientes de la parte extrema, oriental de la Faja Volcánica Trans-Mexicana (FVTM), se caracterizan por 87Srf/86Sr de 0.70342 a 0.70511 y 143Nd/144Nd de 0.51250 a 0.51287. Dado que las rocas volcánicas son muy jóvenes (de edad Plioceno al Cuaternario), se pueden considerar estas relaciones isotópicas medidas como las iniciales. Estos isótopos se correlacionan negativamente y, con una excepción, caen en el campo del 'arreglo del manto'. La variación isotópica no se puede explicar por modelos binaries sencillos, ni por modelos de tipo AFC. Nuestra interpretación sugiere un modelo complejo involucrando las heterogeneidades en el manto y la asimilación del material cortical.
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