The ignimbrites of Terceira, Azores
International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980. On the oceanic islands of the Atlantic ignimbrites are known to occur on Iceland, Gran Canaria, Tenerife and on two of the Azores islands, Terceira and São Miguel. Ignimbrite may form a larger proportion of...
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ftunivacores:oai:repositorio.uac.pt:10400.3/4913 2023-05-15T16:50:08+02:00 The ignimbrites of Terceira, Azores Self, Stephen 1982-07 http://hdl.handle.net/10400.3/4913 eng eng Universidade dos Açores SELF, Stephen (1982). The ignimbrites of Terceira, Azores. "Arquipélago. Série Ciências da Natureza", 3: 113-114. http://hdl.handle.net/10400.3/4913 openAccess Geology Volcanism article 1982 ftunivacores 2022-05-01T14:31:39Z International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980. On the oceanic islands of the Atlantic ignimbrites are known to occur on Iceland, Gran Canaria, Tenerife and on two of the Azores islands, Terceira and São Miguel. Ignimbrite may form a larger proportion of the total volume of rock on the island of Terceira than it does on any of the other islands, yet the individual eruption volumes are small (≤ 1 km³). There have been at least 6 major ignimbrite forming eruptions during the islands' history, and older ash-fall sequences may provide evidence of several others. The two youngest ignimbrites, the Lajes (23,000yBP) and the Angra (19,000yBP) resulted from caldera-forming eruptions of Pico Alto volcano, a «parasitic» caldera on the north flanks of the older Guilherme Moniz volcano. Both pyroclastic flows reached the edge of the island and much o-f the deposition was probably submarine. The cooling units are relatively thin (1-20 m), but the Lajes is densely welded, a feature typical of highly alkaline ignimbrites. […]. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Iceland Repositório da Universidade dos Açores |
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Open Polar |
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Repositório da Universidade dos Açores |
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ftunivacores |
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English |
topic |
Geology Volcanism |
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Geology Volcanism Self, Stephen The ignimbrites of Terceira, Azores |
topic_facet |
Geology Volcanism |
description |
International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980. On the oceanic islands of the Atlantic ignimbrites are known to occur on Iceland, Gran Canaria, Tenerife and on two of the Azores islands, Terceira and São Miguel. Ignimbrite may form a larger proportion of the total volume of rock on the island of Terceira than it does on any of the other islands, yet the individual eruption volumes are small (≤ 1 km³). There have been at least 6 major ignimbrite forming eruptions during the islands' history, and older ash-fall sequences may provide evidence of several others. The two youngest ignimbrites, the Lajes (23,000yBP) and the Angra (19,000yBP) resulted from caldera-forming eruptions of Pico Alto volcano, a «parasitic» caldera on the north flanks of the older Guilherme Moniz volcano. Both pyroclastic flows reached the edge of the island and much o-f the deposition was probably submarine. The cooling units are relatively thin (1-20 m), but the Lajes is densely welded, a feature typical of highly alkaline ignimbrites. […]. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Self, Stephen |
author_facet |
Self, Stephen |
author_sort |
Self, Stephen |
title |
The ignimbrites of Terceira, Azores |
title_short |
The ignimbrites of Terceira, Azores |
title_full |
The ignimbrites of Terceira, Azores |
title_fullStr |
The ignimbrites of Terceira, Azores |
title_full_unstemmed |
The ignimbrites of Terceira, Azores |
title_sort |
ignimbrites of terceira, azores |
publisher |
Universidade dos Açores |
publishDate |
1982 |
url |
http://hdl.handle.net/10400.3/4913 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
SELF, Stephen (1982). The ignimbrites of Terceira, Azores. "Arquipélago. Série Ciências da Natureza", 3: 113-114. http://hdl.handle.net/10400.3/4913 |
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openAccess |
_version_ |
1766040306335088640 |