| Título: | El Chichón Volcano (Chiapas Volcanic Belt, Mexico)Transitional Calc-Alkaline to Adakitic-Like Magmatism:Petrologic and Tectonic Implications |
| Autores: | Ignacio San José, Cristina de ; Castiñeiras García, Pedro ; Márquez González, Álvaro ; Oyarzun, Roberto ; Lillo Ramos, F. Javier ; López Ruiz-Labranderas, Iván |
| Tipo de documento: | texto impreso |
| Editorial: | Taylor & Francis, 2003 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
The rocks of the 1982 eruption of El Chichón volcano (Chiapas, Mexico) display a series of geochemical and mineralogical features that make them a special case within the NW-trending Chiapas volcanic belt. The rocks are transitional between normal arc and adakitic-like trends. They are anhydrite-rich, and were derived from a water-rich, highly oxidized sulfur-rich magma, thus very much resembling adakitic magmas (e.g., the 1991 Pinatubo eruption). We propose that these rocks were generated within a complex plate tectonic scenario involving a torn Cocos plate (Tehuantepec fracture zone) and the ascent of hot asthenospheric mantle. The latter is supported by an outstanding negative S-wave anomaly widely extending beneath the zone, from 70 to 200 km in depth. The adakitic- like trend would be derived from the direct melting of subducting Cocos plate, whereas the transitional rocks would have resulted from the mixing of two poles, one reflecting a mantle source, and the other, the already mentioned adakitic melts. The basaltic source would also account for the high sulfur content and 34S values of the El Chichón system (about +5.8), as result of a contribution of SO2 in fluids released from an underlying mafic magma. |
| En línea: | https://eprints.ucm.es/id/eprint/14023/1/de_Ignacio_et_al_03_%28El_Chich%C3%B3n%29_P%C3%A1gina_1..pdf |
Ejemplares
| Estado |
|---|
| ningún ejemplar |
