Abstract
The variation in the activity patterns of the Chichinautzin volcanic rocks is discussed. This sequence of lavas and pyroclastic deposits is located in the central part of the Mexican Volcanic Belt, directly south of Mexico City, and is typical of its Quaternary monogenetic vulcanism.
One-hundred and fourty-six volcanoes and their deposits covering 952 km2 were mapped. Cone density is 0.15 km2 with heights ranging from to 315 m and crater diameters from 50 to 750 m. Ratios of cone height/diameter decreased from 0.20 to 0.12 with age. Basal diameters varied from 0.1 km to 2 km.
Lavas are mainly blocky andesites but some dacites and basalts were found. Lengths of flows range from 1.0 to 21.5 km with heights of 0.5 to 300 m and aspect rations of 21.4 to 350.
Three types of volcanic structures are found in the area: scoria cones, lavas cones and thick flows lacking a cone. Pyroclastic deposits are basically Strombolian although some deposits were produced by more violent activity and lava cones seem to have formed by activity transitional to Hawaiian-type vulcanism.
Therre is a dominant E-W trend shown mainly by the orientation of cone clusters.
The Chichinautzin volcanic centers are compared to the monogenetic volcanoes of the Toluca and Paricutin areas which are similar.
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del Pozzo, A.L.M. Monogenetic vulcanism in sierra Chichinautzin, Mexico. Bull Volcanol 45, 9–24 (1982). https://doi.org/10.1007/BF02600386
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DOI: https://doi.org/10.1007/BF02600386