Distribution and stratigraphy of deposits produced by diluted pyroclastic density currents of the 1982 eruption of El Chichón volcano, Chiapas, Mexico
The March 29 to April 4, 1982 eruption of El Chichón volcano in southeastern Mexico wascharacterized by a complex interplay between magmatic and phreatomagmatic eruptive events, that wereresponsible for the generation of plinian columns and concentrated and diluted density currents. Revisionof the s...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57222203 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57222203 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra Mexico Chiapas El Chichón 1982 eruption pyroclastic density currents |
| Sumario: | The March 29 to April 4, 1982 eruption of El Chichón volcano in southeastern Mexico wascharacterized by a complex interplay between magmatic and phreatomagmatic eruptive events, that wereresponsible for the generation of plinian columns and concentrated and diluted density currents. Revisionof the stratigraphy indicates that the interaction between magma and hydrothermal acid water playedan important role during the last phases of the eruption. Diluted density currents were widely dispersed,mainly to the eastern side of the volcano due to the particular topographic conditions in this area. Theoverall distribution of pyroclastic surge deposits refl ects the dispersal of fallout deposits determined bythe direction of tropospheric (ENE) winds at the time of the eruption. This observation suggests thatnear-ground winds were strong and blowing in the same direction as high altitude (<18 km) winds, thusenhancing the dispersion of the vanishing portions of the pyroclastic density currents. |
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