Excursion guide for field trip V2 : ‘Island of Terceira’

Detalhes bibliográficos
Autor(a) principal: Self, Stephen
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/10400.3/4884
Resumo: International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
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spelling Excursion guide for field trip V2 : ‘Island of Terceira’VolcanismTerceira Island (Azores)Azores ArchipelagoInternational Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.The island of Terceira is 406 km2 in area and rises to 1021 metres above sea level. It consists of four strato-volcanoes grouped along a prominent fissure zone (Fig. 1). Two volcanoes, Pico Alto and Santa Barbara, are active and the other two, Guilherme Moniz and Cinquo Picos, are believed to be extinct. The fissure zone may be the sub-aerial expression of the Terceira Rift, regarded by Krause and Watkins (1970) as a secondary spreading centre. Terceira shows a great diversity of lavas and pyroclastics for an oceanic island and is noteworthy for voluminous production of peralkaline salic magma. Of the four volcanoes forming the island ; three are composed of both basic and salic rocks and one has only salic rocks exposed. Since the emergence of the island a compositionally bimodal population of rocks has been represented. The products of over 100 eruptions in the upper Terceira Group have been recognized. These include ignimbrites, pumice fall deposits, salic lava extrusions, strombolian scoria deposits, basaltic lava flows and littoral (surtseyan) basaltic tuffs. Basaltic activity is concentrated along the fissure zone which bisects the island diagonally from NW to SE. Volumetric studies give the rate of accumulation of new crust along this small spreading centre; 5.46 km3 of new material has been erupted on the island in the past 23,000 years, of which over 4 km3 is comendite pantellerite composition. The island's economy is dominated by agriculture and dairy farming. Much of the water for the maintown of Angra do Heroísmo (approximately 20,000 population) comes from underground springs or streams in the lava tubes of a 2000-year-ald basalt in Guilherme Moniz Caldera. The island has a good system of roads. Almost the entire papulation lives around a 5 km wide coastal strip (Fig. 2).Universidade dos AçoresRepositório da Universidade dos AçoresSelf, Stephen2018-11-27T14:22:11Z1982-071982-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.3/4884engSELF, Stephen (1982). Excursion guide for field trip V2: ‘Island of Terceira’. "Arquipélago. Série Ciências da Natureza", 3: 329-342.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:RCAAP2022-12-20T14:33:08Zoai:repositorio.uac.pt:10400.3/4884Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:27:12.745836Repositório 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 Excursion guide for field trip V2 : ‘Island of Terceira’
title Excursion guide for field trip V2 : ‘Island of Terceira’
spellingShingle Excursion guide for field trip V2 : ‘Island of Terceira’
Self, Stephen
Volcanism
Terceira Island (Azores)
Azores Archipelago
title_short Excursion guide for field trip V2 : ‘Island of Terceira’
title_full Excursion guide for field trip V2 : ‘Island of Terceira’
title_fullStr Excursion guide for field trip V2 : ‘Island of Terceira’
title_full_unstemmed Excursion guide for field trip V2 : ‘Island of Terceira’
title_sort Excursion guide for field trip V2 : ‘Island of Terceira’
author Self, Stephen
author_facet Self, Stephen
author_role author
dc.contributor.none.fl_str_mv Repositório da Universidade dos Açores
dc.contributor.author.fl_str_mv Self, Stephen
dc.subject.por.fl_str_mv Volcanism
Terceira Island (Azores)
Azores Archipelago
topic Volcanism
Terceira Island (Azores)
Azores Archipelago
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
2018-11-27T14:22:11Z
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/10400.3/4884
url http://hdl.handle.net/10400.3/4884
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv SELF, Stephen (1982). Excursion guide for field trip V2: ‘Island of Terceira’. "Arquipélago. Série Ciências da Natureza", 3: 329-342.
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)
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