Crustal structure of the Arteaga Complex, Michoacan, southern Mexico, from gravity and magnetics
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Resumen
La región de Arteaga, Michoacán, sur de Mexico, es una de las pocas áreas con afloramientos del basamento en el terreno Guerrero. El subterreno Zihuatanejo esta caracterizado por secuencias volcanosedimentarias de arco de islas de edad Jurásico Tardío-Cretácico Temprano que yacen discordantemente sobre las rocas metamorfizadas del Complejo Arteaga de posible edad Triásico-Jurásico. Las mediciones de gravedad de Bouguer y campo total magnético fueron realizadas a lo largo de dos perfiles SW-NE cruzando los complejos ígneo y metamórfico. El análisis espectral es usado para estimar las profundidades de Moho y de las principales interfaces corticales. El espesor de la corteza se incrementa hacia el N y NE a medida que nos alejamos del margen continental, siendo del orden de 28-32 km. El complejo metamórfico tiene un espesor promedio de 15 km. En el sector norte cerca de Tumbiscatio de Ruiz, las unidades metamórficas más superficiales presentan un contraste bajo de densidad posiblemente debido a una alteración regional. El batolito granítico y granodiorítico tienen un espesor superior a los 8 km en el sector SE. Los modelos gravimétricos son consistentes con un basamento del subterreno Zihuatanejo, constituido por el Complejo Arteaga.
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