Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica

An outcrop at El Cruce, 5.7 km from the vent of Arenal volcano, exposes thick sequences of tworecent tephras, ET4 (silicic) and, immediately above, ET3 (mafic). The ET4 to ET3 transition is abrupt, with nosoil between the layers. Therefore, they appear to be part of one eruptive phase. A petrologica...

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Autores: Bolge, Louis L., Carr, Michael J., Feigenson, Mark D., Borgia, Andrea
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Costa Rica
Institución:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
OAI Identifier:oai:portal.ucr.ac.cr:article/7280
Acceso en línea:https://revistas.ucr.ac.cr/index.php/geologica/article/view/7280
Access Level:acceso abierto
Palabra clave:arenal volcano
magmatic evolution
silicic tephras
mafic tephras
stratigraphy
crystal fractionation
parent magma
volcán arenal
evolución magmática
tefras silíceas
tefras máficas
estratigrafía
cristalización
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spelling Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa RicaGeochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa RicaBolge, Louis L.Carr, Michael J.Feigenson, Mark D.Borgia, Andreaarenal volcanomagmatic evolutionsilicic tephrasmafic tephrasstratigraphycrystal fractionationparent magmavolcán arenalevolución magmáticatefras silíceastefras máficasestratigrafíacristalizaciónAn outcrop at El Cruce, 5.7 km from the vent of Arenal volcano, exposes thick sequences of tworecent tephras, ET4 (silicic) and, immediately above, ET3 (mafic). The ET4 to ET3 transition is abrupt, with nosoil between the layers. Therefore, they appear to be part of one eruptive phase. A petrological model is inferredfrom the detailed stratigraphic record of these eruptions. The ET4 sequence can be modeled by crystal fractionation via gravity settling. ET4 is most mafic at the top of the section. The silicic tephra at the bottom of thisunit is aphyric. Compatible elements increase and incompatible elements decrease moving down through themagma chamber. The percentage of phenocrysts increases through the top. Models of crystal fractionation, usingthe most mafic and phenocryst enriched tephra as the parent magma, produce the most silicic tephra by removal of 37% phenocrysts. The ET3 sequence shows the opposite trend of that seen in the ET4 sequence, becoming less enriched in incompatible elements down through the section. Some crystal sorting, followed by theremoval of a silicic melt from the top of the magma chamber, could generate the reversed trend for the ET3 sequence. Un afloramiento en El Cruce, a 5,7 km del cráter del volcán Arenal, expone una espesa secuenciacon dos tefras recientes: ET4 (silícea) e inmediatamente arriba ET3 (máfica). La transición de ET4 a ET3 esabrupta, sin suelo entre ellas. En consecuencia, parecen ser parte de una sola fase eruptiva. Se infiere un modelo petrológico a partir del registro estratigráfico de estas erupciones. La secuencia de ET4 se puede modelar porcristalización fraccionada por depositación gravitacional, en donde el techo de la sección es más máfico. La tefra silícea en la base de ET4 es afírica. Los elementos compatibles se incrementan y los incompatibles disminuyen conforme se avanza hacia el piso de la cámara magmática. La cantidad de fenocristales se incrementa haciael techo. Los modelos de cristalización fraccionada usando las tefras más máficas y ricas en fenocristales comoel magma parental, producen las tefras más silíceas por remoción del 37% de los fenocristales. La secuencia de ET3 muestra el patrón opuesto al visto en ET4, tornándose menos enriquecida en elementos incompatibles conforme bajamos en la sección. Alguna selección de cristales, seguida de la remoción del fundido silíceo del techo de la cámara magmática, podría generar el patrón inverso para la secuencia de ET3.   Universidad de Costa Rica2011-06-01info: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/728010.15517/rgac.v0i30.7280 Revista geológica de América central; Vol. 30 (2004) Revista geológica de América central; Vol. 30 (2004)2215-261X0256-7024reponame:Portal de Revistas UCRinstname:Universidad de Costa Ricainstacron:UCRhttps://revistas.ucr.ac.cr/index.php/geologica/article/view/7280/6958Derechos de autor 2014 Revista Geológica de América Centralacceso abiertohttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccess2023-04-26T01:43:05Zoai:portal.ucr.ac.cr:article/7280Portal 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:2025-08-13T10:31:21.733Portal de Revistas UCR - Universidad de Costa Ricafalse
dc.title.none.fl_str_mv Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
title Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
spellingShingle Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
Bolge, Louis L.
arenal volcano
magmatic evolution
silicic tephras
mafic tephras
stratigraphy
crystal fractionation
parent magma
volcán arenal
evolución magmática
tefras silíceas
tefras máficas
estratigrafía
cristalización
title_short Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
title_full Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
title_fullStr Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
title_full_unstemmed Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
title_sort Geochemistry and magmatic evolution of explosive tephras et3 and et4 from Arenal Volcano, Costa Rica
dc.creator.none.fl_str_mv Bolge, Louis L.
Carr, Michael J.
Feigenson, Mark D.
Borgia, Andrea
author Bolge, Louis L.
author_facet Bolge, Louis L.
Carr, Michael J.
Feigenson, Mark D.
Borgia, Andrea
author_role author
author2 Carr, Michael J.
Feigenson, Mark D.
Borgia, Andrea
author2_role author
author
author
dc.subject.none.fl_str_mv arenal volcano
magmatic evolution
silicic tephras
mafic tephras
stratigraphy
crystal fractionation
parent magma
volcán arenal
evolución magmática
tefras silíceas
tefras máficas
estratigrafía
cristalización
topic arenal volcano
magmatic evolution
silicic tephras
mafic tephras
stratigraphy
crystal fractionation
parent magma
volcán arenal
evolución magmática
tefras silíceas
tefras máficas
estratigrafía
cristalización
description An outcrop at El Cruce, 5.7 km from the vent of Arenal volcano, exposes thick sequences of tworecent tephras, ET4 (silicic) and, immediately above, ET3 (mafic). The ET4 to ET3 transition is abrupt, with nosoil between the layers. Therefore, they appear to be part of one eruptive phase. A petrological model is inferredfrom the detailed stratigraphic record of these eruptions. The ET4 sequence can be modeled by crystal fractionation via gravity settling. ET4 is most mafic at the top of the section. The silicic tephra at the bottom of thisunit is aphyric. Compatible elements increase and incompatible elements decrease moving down through themagma chamber. The percentage of phenocrysts increases through the top. Models of crystal fractionation, usingthe most mafic and phenocryst enriched tephra as the parent magma, produce the most silicic tephra by removal of 37% phenocrysts. The ET3 sequence shows the opposite trend of that seen in the ET4 sequence, becoming less enriched in incompatible elements down through the section. Some crystal sorting, followed by theremoval of a silicic melt from the top of the magma chamber, could generate the reversed trend for the ET3 sequence. 
publishDate 2011
dc.date.none.fl_str_mv 2011-06-01
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/7280
10.15517/rgac.v0i30.7280
url https://revistas.ucr.ac.cr/index.php/geologica/article/view/7280
identifier_str_mv 10.15517/rgac.v0i30.7280
dc.relation.none.fl_str_mv https://revistas.ucr.ac.cr/index.php/geologica/article/view/7280/6958
dc.rights.none.fl_str_mv Derechos de autor 2014 Revista Geológica de América Central
acceso abierto
http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Derechos de autor 2014 Revista Geológica de América Central
acceso abierto
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv 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. 30 (2004)
Revista geológica de América central; Vol. 30 (2004)
2215-261X
0256-7024
reponame:Portal de Revistas UCR
instname:Universidad de Costa Rica
instacron:UCR
instname_str Universidad de Costa Rica
instacron_str UCR
institution UCR
reponame_str 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
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score 15,812455

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