Publication
The ignimbrites of Terceira, Azores
| dc.contributor.author | Self, Stephen | |
| dc.date.accessioned | 2018-11-30T11:20:08Z | |
| dc.date.available | 2018-11-30T11:20:08Z | |
| dc.date.issued | 1982-07 | |
| dc.description | International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980. | en |
| dc.description.abstract | 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. […]. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | SELF, Stephen (1982). The ignimbrites of Terceira, Azores. "Arquipélago. Série Ciências da Natureza", 3: 113-114. | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10400.3/4913 | |
| dc.language.iso | eng | pt_PT |
| dc.publisher | Universidade dos Açores | pt_PT |
| dc.subject | Geology | en |
| dc.subject | Volcanism | en |
| dc.title | The ignimbrites of Terceira, Azores | en |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Ponta Delgada, Açores | pt_PT |
| oaire.citation.endPage | 114 | pt_PT |
| oaire.citation.startPage | 113 | pt_PT |
| oaire.citation.title | Arquipélago. Série Ciências da Natureza | pt_PT |
| oaire.citation.volume | 3 | pt_PT |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |