Historical Tephra-stratigraphy of the Cosigüina Volcano (Western Nicaragua)
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| Συγγραφείς: | , |
|---|---|
| Μορφή: | artículo original |
| Κατάσταση: | Versión publicada |
| Ημερομηνία έκδοσης: | 2007 |
| Περιγραφή: | New detailed geological field studies and 14C dating of the Cosigüina Volcano (westernmost Nicaragua) allow to reconstruct a geological map of the volcano and to establish a recent stratigraphy, including three historical eruptions. Five major sequences are represented. I: pyroclastic flows around 1500 AD, II: pyroclastic flows, scoria and pumice flows and surges, III: pyroclastic deposits related to a litoral crater, IV: pyroclastic flows related to 1709 AD eruption, and finally, V: pyroclastic deposits corresponding to the cataclysmic 1835 AD phreatic, phreatomagmatic and subplinian eruption, which seems to be relatively small-scale in comparison with the preceding historical eruptions. The pulsating geochemical character of the pyroclastic rocks in the last five centuries has been documented. The beginning of every eruption is marked by increasing contents of silica and Zr. Based on that, regardless of present-day volcanic repose, the entire Cosigüina Peninsula should be considered as a very hazardous volcanic area. |
| Χώρα: | Portal de Revistas UCR |
| Ίδρυμα: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Γλώσσα: | Español |
| OAI Identifier: | oai:archivo.portal.ucr.ac.cr:article/4217 |
| Διαθέσιμο Online: | https://archivo.revistas.ucr.ac.cr/index.php/geologica/article/view/4217 |
| Λέξη-Κλειδί : | Volcán Cosigüina tefraestratigrafía Nicaragua Golfo de Fonseca datación C Cosigüina volcano tephra-stratigraphy Fonseca Gulf C dating |