A widespread mafic volcanic unit at the base of the Mexican Volcanic Belt between Guadalajara and Querétaro
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Resumen
Grandes mesetas basálticas, emplazadas principalmente entre 10 y 6 Ma, forman la parte basal de las vulcanitas de la Faja Volcánica Mexicana (FVM), en el centro de México. En las áreas de Guadalajara y Querétaro, estas mesetas están separadas de las ignimbritas y andesitas de la Sierra Madre Occidental, de edad Oligoceno Tardío a Mioceno Temprano, por un período de calma volcánica marcado por varios depósitos erosionales, mientras que en las áreas alrededor de los lagos de Chapala y de Cuitzeo sobreyacen a secuencias andesíticas de edad Mioceno Medio a Mioceno Tardío. Las lavas de estas mesetas son relativamente primitivas (Mg#66-52), no sufrieron un fraccionamiento de baja presión significativo, y muestran claramente afinidades calci-alcalinas. Estas mesetas de basalto representan el primer evento volcánico en la historia de la FVM amplia y uniformemente distribuído. Los datos geológicos y geoquímicos sugieren que estos basaltos fueron emplazados duninte la primera fase tectónica extensional que acompañó a la FVM.
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