Geochemistry of Eyjafjöll, a volcano in southern Iceland

Detalhes bibliográficos
Autor(a) principal: Arney, Barbara
Data de Publicação: 1982
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.3/4903
Resumo: International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
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spelling Geochemistry of Eyjafjöll, a volcano in southern IcelandGeochemistryVolcanic SoilsInternational Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.Eyjafjöll is a central volcano in the eastern neo-volcanic zone of southern Iceland. Its last eruption occurred from 1821 to 1823. Most of the volcano is composed of transitional alkali basalt and basaltic andesite. Rhyolites and dacites have been erupted only from the central, glacier capped, caldera. Good stratigraphic coverage was obtained from three traverses from the base of the mountain to the ground moraine on top. The best section was sampled on the deeply dissected southern side of the volcano. Major element whole-rock analysis of 64 samples and microprobe determined compositions of selected phenocryst phases have been used to develop a fractionation model relating the various rock types produced by the volcano. Considerable subtraction of olivine from a hypothetical primary magma is required to produce even the least silicic compositions observed at the surface. More silicic compositions can be derived from one of two «parent» compositions, chosen from the least differentiated rocks sampled, by further subtraction of plagioclase, clinopyroxene, and magnetite with minor ilmenite and olivine. No separate source or mechanism is required to produce the small quantities of rhyolite found, as they can be derived by fractionation. There is some evidence that the magmas of Eyjafjöll have become less alkalic and more silicasaturated with time.Universidade dos AçoresRepositório da Universidade dos AçoresArney, Barbara2018-11-29T11:37:44Z1982-071982-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.3/4903engARNEY, Barbara (1982). Geochemistry of Eyjafjöll, a volcano in southern Iceland. "Arquipélago. Série Ciências da Natureza", 3: 177-178.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-12-20T14:33:09Zoai:repositorio.uac.pt:10400.3/4903Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:27:13.677125Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Geochemistry of Eyjafjöll, a volcano in southern Iceland
title Geochemistry of Eyjafjöll, a volcano in southern Iceland
spellingShingle Geochemistry of Eyjafjöll, a volcano in southern Iceland
Arney, Barbara
Geochemistry
Volcanic Soils
title_short Geochemistry of Eyjafjöll, a volcano in southern Iceland
title_full Geochemistry of Eyjafjöll, a volcano in southern Iceland
title_fullStr Geochemistry of Eyjafjöll, a volcano in southern Iceland
title_full_unstemmed Geochemistry of Eyjafjöll, a volcano in southern Iceland
title_sort Geochemistry of Eyjafjöll, a volcano in southern Iceland
author Arney, Barbara
author_facet Arney, Barbara
author_role author
dc.contributor.none.fl_str_mv Repositório da Universidade dos Açores
dc.contributor.author.fl_str_mv Arney, Barbara
dc.subject.por.fl_str_mv Geochemistry
Volcanic Soils
topic Geochemistry
Volcanic Soils
description International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
publishDate 1982
dc.date.none.fl_str_mv 1982-07
1982-07-01T00:00:00Z
2018-11-29T11:37:44Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.3/4903
url http://hdl.handle.net/10400.3/4903
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv ARNEY, Barbara (1982). Geochemistry of Eyjafjöll, a volcano in southern Iceland. "Arquipélago. Série Ciências da Natureza", 3: 177-178.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Universidade dos Açores
publisher.none.fl_str_mv Universidade dos Açores
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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