Duripans in subtropical and temperate subhumid climate of the trans-Mexico Volcanic Belt
Por:
Flores-Román D., Alcalá-Martínez J.R., González-Velázquez A., Gama-Castro J.E.
Publicada:
1 ene 1996
Resumen:
The objectives of this work are: (1) to determine, by means of a basic investigation, the main properties of the soils and the duripans in the study area; and (2) to generate information about the genesis of both. The main results are that: (a) the pedologic profiles are highly developed; (b) the silt and very fine sand particles have subangular roundness and low sphericity; (c) the duripans, contrary to the solum, have a lower number of pores, which have a lower diameter, are not continuous and are partially closed; (d) the duripans have a low resistance to single compression; and (e) there are high contents of Al2O3 in the duripan cementing matrix. The principal conclusions are: (a) petrographically, the duripans are pyroclastic deposits of intermediate composition; (b) the clay-fraction mineralogy consists of kaolinite and metahalloysite; (c) the soils are considered paleosoils, formed as a consequence of a paleobioclimatic event (glaciation); and (d) the duripans have an igneous origin with secondary pedogenetic cementation.
Filiaciones:
Flores-Román D.:
Instituto de Geología, Universidad Nacional Autónoma de México, Delegación Coyoacán, 04510, D.F., Mexico
Alcalá-Martínez J.R.:
Instituto de Geología, Universidad Nacional Autónoma de México, Delegación Coyoacán, 04510, D.F., Mexico
González-Velázquez A.:
Instituto de Geología, Universidad Nacional Autónoma de México, Delegación Coyoacán, 04510, D.F., Mexico
Gama-Castro J.E.:
Instituto de Geología, Universidad Nacional Autónoma de México, Delegación Coyoacán, 04510, D.F., Mexico
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