Explosive activity of turrialva volcano (costa rica) in 2010-2016
The most recent eruptive activity of Turrialba volcano began on the 5th of January 2010, after more than one century of dormancy. The fragmentation process and aerodynamic behavior of ash from Turrialba vulcanian eruptions were investigated by combining grain-size, petrography, mineralogy, Scanning...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Costa Rica |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Idioma: | español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/26965 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/geologica/article/view/26965 |
| Access Level: | acceso abierto |
| Palabra clave: | Volcanic ash vulcanian eruptions pheatomagmatism eruptive column collapse pyroclastic surges hydrothermal alteration granulometry SFT Turrialba volcano Costa Rica Ceniza volcánica erupciones vulcanianas freatomagmatismo colapso de columna eruptiva oleadas piroclásticas alteración hidrotermal granulometría volcán Turrialba |
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Costa Rica |
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Explosive activity of turrialva volcano (costa rica) in 2010-2016 Actividad explosiva del turrialba (Costa Rica) en el 2010-2016 |
| title |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| spellingShingle |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 Alvarado, Guillermo E. Volcanic ash vulcanian eruptions pheatomagmatism eruptive column collapse pyroclastic surges hydrothermal alteration granulometry SFT Turrialba volcano Costa Rica Ceniza volcánica erupciones vulcanianas freatomagmatismo colapso de columna eruptiva oleadas piroclásticas alteración hidrotermal granulometría SFT volcán Turrialba Costa Rica |
| title_short |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| title_full |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| title_fullStr |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| title_full_unstemmed |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| title_sort |
Explosive activity of turrialva volcano (costa rica) in 2010-2016 |
| dc.creator.none.fl_str_mv |
Alvarado, Guillermo E. |
| author |
Alvarado, Guillermo E. |
| author_facet |
Alvarado, Guillermo E. |
| author_role |
author |
| dc.subject.none.fl_str_mv |
Volcanic ash vulcanian eruptions pheatomagmatism eruptive column collapse pyroclastic surges hydrothermal alteration granulometry SFT Turrialba volcano Costa Rica Ceniza volcánica erupciones vulcanianas freatomagmatismo colapso de columna eruptiva oleadas piroclásticas alteración hidrotermal granulometría SFT volcán Turrialba Costa Rica |
| topic |
Volcanic ash vulcanian eruptions pheatomagmatism eruptive column collapse pyroclastic surges hydrothermal alteration granulometry SFT Turrialba volcano Costa Rica Ceniza volcánica erupciones vulcanianas freatomagmatismo colapso de columna eruptiva oleadas piroclásticas alteración hidrotermal granulometría SFT volcán Turrialba Costa Rica |
| description |
The most recent eruptive activity of Turrialba volcano began on the 5th of January 2010, after more than one century of dormancy. The fragmentation process and aerodynamic behavior of ash from Turrialba vulcanian eruptions were investigated by combining grain-size, petrography, mineralogy, Scanning Electron Microscopy (SEM) and Energy Dispersive System (EDS) analyses. The ash components include by variable percentages of accessory fresh (no necessary juvenile) to hydrothermally altered lithics (15 - 50 % vol.) with hydrothermal minerals (≤ 12 % vol.: anhydrite, gypsum, bassanite?, alunite, hexahydrite, pyrite, heulandite, native sulfur), clay minerals (8 - 17 % vol.: montmorillonite, halloysite, allophane), and a smaller quantity of fresh glassy ashes (5 - 49 % vol.) as fragments and shards (3 - 20 % vol. taquilite and 2 - 26 % vol. sideromelane), primary and eroded/recycled phenocrysts (3 - 13 % vol.: 1 - 5% vol. plagioclase, 1 - 7 % vol. pyroxene, 0 - 1 % vol. olivine, 0 - 6 % vol. opaques, cristobalite and tridimite), and xenocrysts (≤ 1 % vol.: riebeckite and biotite). The secondary minerals were sourced from the deeper to surficial hydrothermal system. Textural features identified in ash particles (90 - 350 µm) suggest that they were formed by brittle fragmentation of vesicle-poor magma/water interaction; molten structures seems to be related to the ductile behavior of some fragments, probably due to the high temperature (> 600 °C) of the fumarolic/magmatic system. The percentage of juvenile components was low (1 - 2 % vol.) from the first opening eruptive phase in January 2010, and it increased with time at the present (ca. 12 - 18 % vol. in 2013 - 2015). The ash eruptions in the Western Crater during 2014 - 2016 were related to one and later two or three simultaneously active vents fed by distinct conduit branches. The alternation of volcanic explosions (VEI: 0 - 2), from closed conduit and the formation of new craters, to open system with phreatomagmatic events, and the repose intervals (inter-eruptive exhalative degassing), were controlled by the rate at which magma ascended and remained in the volcanic edifice. The recent tephra sequence consists of a complex succession of layers generated by contrasting fragmentation and transportation dynamics. They resulted from fully diluted, low temperature (< 300 °C), pyroclastic density currents (wet surge deposits), originate by short-lived, single-pulse, column collapse from phreatomagmatic columns, which traveled short distances (< 1000 m) from the vent area and surmounted topographic obstacles, and simultaneous fallout and ballistic ejecta. The fine material, in continuous suspension within the uppermost part of the convective plume, was disperse into the atmosphere and finally settled down over the Valle Central. The quiescent phases could be related to a temporal cooling of the magmatic dike system or to a waning of magmatic activity at depth. Sequential fragmentation/transport theory (SFT) was used to decompose grain-size distributions into five different sub-populations. A new way of using the resultant fragmentation coefficient to assign sub-populations to different fragmentation mechanisms, even in cases when modes overlapped, is presented. For the first time the corresponding results are consistent with the phreatomagmatic eruptions, as well as with those derived from ab initio fractal model. |
| publishDate |
2016 |
| dc.date.none.fl_str_mv |
2016-12-18 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion Article artículo original http://purl.org/coar/resource_type/c_2df8fbb1 info:eu-repo/semantics/article |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://revistas.ucr.ac.cr/index.php/geologica/article/view/26965 10.15517/rgac.v55i0.26965 |
| url |
https://revistas.ucr.ac.cr/index.php/geologica/article/view/26965 |
| identifier_str_mv |
10.15517/rgac.v55i0.26965 |
| dc.language.none.fl_str_mv |
spa |
| language |
spa |
| dc.relation.none.fl_str_mv |
https://revistas.ucr.ac.cr/index.php/geologica/article/view/26965/27746 |
| dc.rights.none.fl_str_mv |
Derechos de autor 2016 Revista Geológica de América Central acceso abierto http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
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Derechos de autor 2016 Revista Geológica de América Central acceso abierto http://purl.org/coar/access_right/c_abf2 |
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openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
Universidad de Costa Rica |
| publisher.none.fl_str_mv |
Universidad de Costa Rica |
| dc.source.none.fl_str_mv |
Revista geológica de América central; Vol. 55 (2016): July-December Revista geológica de América central; Vol. 55 (2016): Julio-Diciembre 2215-261X 0256-7024 reponame:Portal de Revistas UCR instname:Universidad de Costa Rica instacron:UCR |
| instname_str |
Universidad de Costa Rica |
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UCR |
| institution |
UCR |
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Portal de Revistas UCR |
| collection |
Portal de Revistas UCR |
| repository.name.fl_str_mv |
Portal de Revistas UCR - Universidad de Costa Rica |
| repository.mail.fl_str_mv |
jorge.polanco@ucr.ac.cr |
| _version_ |
1849325418202529792 |
| spelling |
Explosive activity of turrialva volcano (costa rica) in 2010-2016Actividad explosiva del turrialba (Costa Rica) en el 2010-2016Alvarado, Guillermo E.Volcanic ashvulcanian eruptionspheatomagmatismeruptive column collapsepyroclastic surgeshydrothermal alterationgranulometrySFTTurrialba volcanoCosta RicaCeniza volcánicaerupciones vulcanianasfreatomagmatismocolapso de columna eruptivaoleadas piroclásticasalteración hidrotermalgranulometríaSFTvolcán TurrialbaCosta RicaThe most recent eruptive activity of Turrialba volcano began on the 5th of January 2010, after more than one century of dormancy. The fragmentation process and aerodynamic behavior of ash from Turrialba vulcanian eruptions were investigated by combining grain-size, petrography, mineralogy, Scanning Electron Microscopy (SEM) and Energy Dispersive System (EDS) analyses. The ash components include by variable percentages of accessory fresh (no necessary juvenile) to hydrothermally altered lithics (15 - 50 % vol.) with hydrothermal minerals (≤ 12 % vol.: anhydrite, gypsum, bassanite?, alunite, hexahydrite, pyrite, heulandite, native sulfur), clay minerals (8 - 17 % vol.: montmorillonite, halloysite, allophane), and a smaller quantity of fresh glassy ashes (5 - 49 % vol.) as fragments and shards (3 - 20 % vol. taquilite and 2 - 26 % vol. sideromelane), primary and eroded/recycled phenocrysts (3 - 13 % vol.: 1 - 5% vol. plagioclase, 1 - 7 % vol. pyroxene, 0 - 1 % vol. olivine, 0 - 6 % vol. opaques, cristobalite and tridimite), and xenocrysts (≤ 1 % vol.: riebeckite and biotite). The secondary minerals were sourced from the deeper to surficial hydrothermal system. Textural features identified in ash particles (90 - 350 µm) suggest that they were formed by brittle fragmentation of vesicle-poor magma/water interaction; molten structures seems to be related to the ductile behavior of some fragments, probably due to the high temperature (> 600 °C) of the fumarolic/magmatic system. The percentage of juvenile components was low (1 - 2 % vol.) from the first opening eruptive phase in January 2010, and it increased with time at the present (ca. 12 - 18 % vol. in 2013 - 2015). The ash eruptions in the Western Crater during 2014 - 2016 were related to one and later two or three simultaneously active vents fed by distinct conduit branches. The alternation of volcanic explosions (VEI: 0 - 2), from closed conduit and the formation of new craters, to open system with phreatomagmatic events, and the repose intervals (inter-eruptive exhalative degassing), were controlled by the rate at which magma ascended and remained in the volcanic edifice. The recent tephra sequence consists of a complex succession of layers generated by contrasting fragmentation and transportation dynamics. They resulted from fully diluted, low temperature (< 300 °C), pyroclastic density currents (wet surge deposits), originate by short-lived, single-pulse, column collapse from phreatomagmatic columns, which traveled short distances (< 1000 m) from the vent area and surmounted topographic obstacles, and simultaneous fallout and ballistic ejecta. The fine material, in continuous suspension within the uppermost part of the convective plume, was disperse into the atmosphere and finally settled down over the Valle Central. The quiescent phases could be related to a temporal cooling of the magmatic dike system or to a waning of magmatic activity at depth. Sequential fragmentation/transport theory (SFT) was used to decompose grain-size distributions into five different sub-populations. A new way of using the resultant fragmentation coefficient to assign sub-populations to different fragmentation mechanisms, even in cases when modes overlapped, is presented. For the first time the corresponding results are consistent with the phreatomagmatic eruptions, as well as with those derived from ab initio fractal model.La más reciente actividad eruptiva del volcán Turrialba se inició el 5 de enero de 2010, después de más de un siglo de estar dormido. El proceso de formación de cenizas emitidas (i.e., tipo de fragmentación) y el comportamiento aerodinámico de las mismas, se investigaron mediante la combinación de análisis granulométricos, petrografía óptica, análisis mineralógico, microscopía electrónica de barrido (SEM) y sistema de energía dispersiva (EDS). La ceniza estuvo compuesta por porcentajes variables de líticos accidentales, frescos (no necesariamente juveniles) a alterados hidrotermalmente (15 - 50 %), con minerales hidrotermales (1 - 8 % vol.: anhidrita, yeso, bassanita?, alunita, hexahidrita, pirita, heulandita, azufre nativo), minerales de arcilla (8 - 17 %: montmorillonita, haloisita, alofana) y una menor cantidad de vidrio fresco (5 - 49 % vol.) como esquirlas y fragmentos (3 - 20% vol. taquilita y 2 - 26 % vol. sideromelana), fenocristales (3 - 13 % vol.), que pueden ser tanto juveniles como accesorios/reciclados (1 - 5 % vol. plagioclasa, 1 - 7 % vol. piroxeno, 0 - 1 % vol. olivino, 0 - 6 % vol. opacos, cristobalita y tridimita), y xenocristales (≤ 1 % vol.: riebeckita y biotita). Los minerales secundarios son el producto de la alteración hidrotermal profunda y de su expresión en el campo de fumarolas superficial. Las características texturales identificados en partículas de ceniza finas (90 - 350 µm) sugieren que se formaron por la fragmentación debido a la interacción explosiva magma/agua. Las estructuras fundidas parecen estar relacionada con el comportamiento dúctil de las partículas sometidas a altas temperaturas (> 600 ° C) en el sistema de fumarólico/magmático. El porcentaje del componente fresco fue bajo (1 - 2 % vol.) en la apertura del conducto eruptivo del 2010, incrementando paulatinamente hasta el presente (ca. 12 - 18 % vol. en 2013 - 2015). Las erupciones en el cráter Oeste, durante el 2014 al 2016, estuvieron relacionadas con una boca al inicio y después por dos o tres bocas simultáneamente activas. La alternancia de explosiones volcánicas (VEI: 0 - 2), desde conducto cerrado con la formación de nuevos cráteres, hasta un conducto abierto, y los intervalos de reposo (desgasificación exhalativa inter-eruptiva) fue controlado, posiblemente, por la velocidad a la que el magma poco vesiculado ascendió y se mantuvo en el edificio volcánico. Las tefras consistes en una sucesión compleja de capas generadas por corrientes de densidad piroclástica diluidas (principalmente oleadas húmedas), baja temperatura (< 300 ºC), originadas por pulsos simples y cortos, por el colapso de columnas eruptivas freatomagmáticas, que viajaron cortas distancias (< 1000 m) desde las bocas cratéricas, superando obstáculos, ocurridas simultáneamente con depósitos de caída piroclástica y emisión de proyectiles balísticos. El material fino en suspensión, en la parte superior de la columna convectiva, fue dispersado en la atmósfera y se sedimentó sobre el Valle Central. Los períodos de reposo podrían estar relacionada con un enfriamiento temporal del sistema de diques magmático o por una disminución de la actividad magmática en profundidad. La teoría de la fragmentación / transporte secuencial fue utilizada para deconvolucionar (desagregar) las granulometrías en 5 subpoblaciones, que fueron luego asociadas a mecanismos de fragmentación. Los casos en que se dio traslape de las modas fueron resueltos con una nueva manera de utilizar el coeficiente de fragmentación. Por primera vez se muestra que los resultados obtenidos, por el método mencionado, concuerdan con lo esperado de la erupciones freatomagmáticas, y con lo derivado a partir del modelo ab initio de fractura fractal.Universidad de Costa Rica2016-12-18info:eu-repo/semantics/publishedVersionArticleartículo originalhttp://purl.org/coar/resource_type/c_2df8fbb1info:eu-repo/semantics/articleapplication/pdfhttps://revistas.ucr.ac.cr/index.php/geologica/article/view/2696510.15517/rgac.v55i0.26965 Revista geológica de América central; Vol. 55 (2016): July-December Revista geológica de América central; Vol. 55 (2016): Julio-Diciembre2215-261X0256-7024reponame:Portal de Revistas UCRinstname:Universidad de Costa Ricainstacron:UCRspahttps://revistas.ucr.ac.cr/index.php/geologica/article/view/26965/27746Derechos de autor 2016 Revista Geológica de América Centralacceso abiertohttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccess2023-09-13T01:09:41Zoai:portal.ucr.ac.cr:article/26965Portal de revistashttps://revistas.ucr.ac.cr/Universidadhttp://www.ucr.ac.crhttps://revistas.ucr.ac.cr/index.php/index/oaijorge.polanco@ucr.ac.crCosta RicaNo aplicaNo aplicaNo aplicaopendoar:2025-08-13T10:32:28.959Portal de Revistas UCR - Universidad de Costa Ricafalse |
| score |
15.812455 |