On occurrence of vitrophyres in Macaronesia

Detalhes bibliográficos
Autor(a) principal: Mitchell-Thomé, R. C.
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/10400.3/4895
Resumo: International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
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spelling On occurrence of vitrophyres in MacaronesiaPetrologyMacaronesiaInternational Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.Vitrophyres, defined as rocks in which more than 50% of the groundmass is glass, irrespective of composition and whether porphyritic or not, occur in Macaronesia. In the literature, vitreous rocks are ofter referred to, but where chemical analyses are lacking and only inadequate petrographic descriptions are given, it is not always clear what proportion of such may actually be vitrophyres. On the other hand, references are given to vitrophyres in the region. Vitrophyres certainly are present in the Azores, Canaries and Cape Verde archipelagoes, but are more doubtful in Madeira and the Selvagens. In Tenerife, these rocks are most voluminous though more widespread in Gran Canaria. In the former, the Teide-Viejo volcano complex comprises essentially obsidian-type rocks. It appears that the Macaronesian vitrophyres are of Quaternary/Sub-Recent age, though those of Gran Canaria and La Palma belong to Middle-Lower Miocene. As not all islands have been given the same petrological attention, it is possible that further investigations would show vitrophyres to be more abundant than at present known.Universidade dos AçoresRepositório da Universidade dos AçoresMitchell-Thomé, R. C.2018-11-28T12:38:20Z1982-071982-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.3/4895engMITCHELL-THOME, Raoul C. (1982). On occurrence of vitrophyres in Macaronesia. "Arquipélago. Série Ciências da Natureza", 3: 247-248.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:10400.3/4895Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:27:13.308577Repositório 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 On occurrence of vitrophyres in Macaronesia
title On occurrence of vitrophyres in Macaronesia
spellingShingle On occurrence of vitrophyres in Macaronesia
Mitchell-Thomé, R. C.
Petrology
Macaronesia
title_short On occurrence of vitrophyres in Macaronesia
title_full On occurrence of vitrophyres in Macaronesia
title_fullStr On occurrence of vitrophyres in Macaronesia
title_full_unstemmed On occurrence of vitrophyres in Macaronesia
title_sort On occurrence of vitrophyres in Macaronesia
author Mitchell-Thomé, R. C.
author_facet Mitchell-Thomé, R. C.
author_role author
dc.contributor.none.fl_str_mv Repositório da Universidade dos Açores
dc.contributor.author.fl_str_mv Mitchell-Thomé, R. C.
dc.subject.por.fl_str_mv Petrology
Macaronesia
topic Petrology
Macaronesia
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
2018-11-28T12:38:20Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.3/4895
url http://hdl.handle.net/10400.3/4895
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv MITCHELL-THOME, Raoul C. (1982). On occurrence of vitrophyres in Macaronesia. "Arquipélago. Série Ciências da Natureza", 3: 247-248.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Universidade dos Açores
publisher.none.fl_str_mv Universidade dos Açores
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