Contemporaneous eruptions of calc-alkaline and alkaline magmas along the volcanic front of the Mexican Volcanic Belt
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De acuerdo con los modelos generales para los arcos volcánicos relacionados con la subducción, las composiciones del magma se hacen progresivamente más ricas en K20 y los elementos incompatibles, a medida que aumentan la distancia desde la trinchera y el frente volcánico, y la profundidad de la zona de Benioff. Los magmas típicos de los arcos son característicamente normativos de hiperesteno y cuarzo. Los basaltos alcalinos normativos de nefelino se supone que son expulsados, si acaso, sólo a grandes distancias de la trinchera. Sin embargo, a lo largo del frente del Eje Volcánico Mexicano han hecho erupción magmas básicos alcálicos hídricos, normativos de nefelino en dos diferentes sitios durante el Período Cuaternario Tardío: en el graben del sur de Colima y en el campo volcánico del sur de Michoacán y Guanajuato. En ambos lugares hicieron erupción contemporáneamente magmas calcalcalinos normativos de hiperesteno y cuarzo, característicos de los frentes volcánicos. Estas secuencias contrastantes de magmas no pueden ser correlacionadas mediante un mecanismo simple; parecen registrar distintos episodios de fusión dentro del manto superior.
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