g16 - vulcanismo
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TRANSCRIPT
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As erupções ocorrem ao longo de fracturas/fendas da superfície terrestre. Representa o caso mais vulgar de vulcanismo, não possui chaminé cilíndrica,
nem cratera circular. Ocorre nas zonas de rifte. As suas lavas são básicas. As erupções, quando são continentais (Decão), originam extensos planaltos
de lava basáltica. As erupções subaquáticas vão originar novos fundos oceânicos.
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A erupção ocorre num aparelho vulcânico designado por vulcão. Possui uma chaminé cilíndrica, uma cratera circular central num
cone mais ou menos elevado, por onde saem as lavas e osmateriais piroclásticos.
As crateras encontram-se ligadas a chaminés cilíndricas. Esta actividade vulcânica corresponde à típica actividade
continental.
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Material rochoso semi-fundido, provido de mobilidade e resultante da fusão das rochas da crosta e do manto superior.
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Em igualdade de pressão, a viscosidade diminui quando aumenta a temperatura (mais quente = mais fluido).
Em igualdade de temperatura, a viscosidade aumentacom a pressão (mais comprimido = magma mais imobilizado).
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Em igualdade de pressão e temperatura, a viscosidade é regulada pela concentração de voláteis (ricos em voláteis = maior pressão interna e menor viscosidade = maior mobilidade ou fluidez).
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Matéria magmática fundida expelida pelos vulcões. A diferença da lava relativamente ao magma reside no facto de ter sofrido importante desgaseificação.
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Principais...
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Básicas Ácidas Piroclastosde queda
Piroclastosde fluxo
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aa
encordoada
Maior temperatura menor viscosidade
Menor temperatura maior viscosidade
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Fotos - http://geocrusoe.blogspot.com/search/label/Vulcanismo
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Do ponto de vistagenético
Cinzas Lapilli Bombas e blocos Escoadas
piroclásticas
Nuvens ardentes
Escoadas delama
Pomíticas
Depósitos de Enxurrada - Lahars
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Uma rocha granular, normalmente clara, cujos grãos são muito porosos e flutuam na água
http://geocrusoe.blogspot.com/search/label/Caldeira
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Leve
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http://upload.wikimedia.org/wikipedia/commons/7/76/Porous_scoria.jpg
Magmas básicos
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Escoadas Pomíticas
Pluma de cinzas eexplosões de vapor
Pluma de cinzas eexplosões de vapor
Explosões violentasquando a cinza quentecontacta com a água
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Doma ou cúpula
Agulha
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Caldeira do Faial – Açores.
Foto : http://geocrusoe.blogspot.com/search/label/Caldeira
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Caldeiras de Colapso
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Caldeiras de Explosão
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