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https://hdl.handle.net/10316/3936
Título: | The volcanotectonic evolution of Flores Island, Azores (Portugal) | Autor: | Azevedo, J. M. M. Ferreira, M. R. Portugal |
Palavras-chave: | volcanic island; volcanic complex and unit; volcanostratigraphy; subsidence and uplift | Data: | 2006 | Citação: | Journal of Volcanology and Geothermal Research. 156:1-2 (2006) 90-102 | Resumo: | From the study and interpretation of the volcanic products and structures of Flores Island, we infer that its volcanic history was dominated by two major periods: (1) proto-insular volcanism, which includes all the submarine and emergent activities; and (2) insular volcanism, consisting exclusively of subaerial eruptions. The first period includes two phases: (1) the oldest (2.2 to 1.5 Ma) of shallow submarine volcanism; (2) the youngest (1.0 to 0.75 Ma) includes emergent volcanism. Throughout the second period, three volcanic stages are recognized: (1) the first one (0.7 to 0.5 Ma) includes the most voluminous volcanism, balanced between effusive and explosive events; (2) an intermediate stage (0.4 to 0.2 Ma) that involves a larger number of small-scale feeder centres, with effusive eruptions prevailing; (3) the third stage is the latest volcanic activity of the Island ([approximate] 0.003 Ma), with strombolian and subsequent phreatic and phreatomagmatic activity centred at four volcanic vents. | URI: | https://hdl.handle.net/10316/3936 | DOI: | 10.1016/j.jvolgeores.2006.03.011 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Ciências da Terra - Artigos em Revistas Internacionais |
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file4aeba739e3584e7b84f0fcaddc1f367e.pdf | 858.68 kB | Adobe PDF | Ver/Abrir |
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