Morphological and structural analysis of the central sector of the Transmexican Volcanic Belt
In this paper the post-orogenic evolution of a central sector of the Mexican Volcanic Belt (MVB) in the states of Guanajuato and Michoacan is analyzed. The main structural units are recognized on the basis of a morphological analysis and geological data. Four categories of morphological units were e...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 1987 |
| Country: | México |
| Institution: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repository: | Geofísica Internacional |
| Language: | Spanish |
| OAI Identifier: | oai:revistagi.geofisica.unam.mx:article/1084 |
| Online Access: | http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1084 |
| Access Level: | Open access |
| Keyword: | Morfología geología evolución post laramídica Morphology geology post laramidic evolution cinturón volcánico mexicano |
| Summary: | In this paper the post-orogenic evolution of a central sector of the Mexican Volcanic Belt (MVB) in the states of Guanajuato and Michoacan is analyzed. The main structural units are recognized on the basis of a morphological analysis and geological data. Four categories of morphological units were established. These are: 1. Reliefs belonging to geological formations older than MVB and characterized by Laramide orogenic deformation. 2. Pre-MVB planar structural surfaces. 3. Depositional surfaces belonging to sedimentary orvolcanoclastic infilling of post-orogenic tectonic depressions. 4. Surfaces of MVB volcanoes. In this analysis the main morphogenetic stages were recognized ;these were related to tensional tectonic phases and to the main volcanic events. An early tensional tectonic phase is associated with the volcanic activity which formed the pre-Miocene deposits of the Sierra Madre Occidental. A NNW-SSE trending system is dominant during the late Miocene and is related to the "Basin and Range" province of western U. S. A. NW-SE faulting during Pliocene along Californian trends is responsible for the initial volcanic activity of the MVB. Late Pliocene trends are WSW-ENE. The last tensional phase causes N-S and NNE-SSW grabens, as a possible reactivation of "Basin and Range" structures. |
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