Volcanic geology and preliminary chemical character of the rocks of the Tula-Polotitlán region, states of Hidalgo, Mexico and Querétaro, México

  • Luis Silva-Mora Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04510 D.F., México.
Keywords: Volcanism, Tula, Polotitlán, Hidalgo, Mexico.


The study area is located 90 km to the NNW of Mexico City, and has an approximate extension of 1,800 km2, making up the Tula de Allende and Polotitlán quadrangles (CETENAL, 1975a, b). The rocks that crop out in the region resulted from four volcanic episodes that are recognized in the State of Hidalgo… in order to continue, download the full paper in PDF