Download - Geo 16 rochas metamórficas
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Tensão Calor Fluidos Tempo
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Litostática Não Litostática (dirigida)
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A sul dos Açores, associadas à Crista Médio-Atlântica, existem fontes hidrotermais profundas. No fundo oceânico, existem pequenas mas numerosas fissuras, através das quais a água fria do oceano entra em contacto com as rochas quentes, formadas recentemente. A água aquecida sobe e arrasta consigo vários constituintes das rochas circundantes. Quando emerge do interior da Terra, no fundo oceânico, o fluido é rico em sais, muitas vezes metálicos, que se vão depositando em torno da abertura, formando uma estrutura a que se dá o nome de chaminé. Dela emanam, sem cessar, inúmeros gases ricos em metano e compostos de enxofre, criando à sua volta um ambiente único. Nesses locais, a água circula a temperaturas que podem atingir os 400 ºC, mantendo-se no estado líquido, devido às elevadas pressões a que está submetida. No entanto, a três centímetros do fluxo principal de água quente, a temperatura é a normal para essas profundidades, de apenas 2 ºC. Associadas às fontes hidrotermais profundas, desenvolvem-se bactérias quimioautotróficas, que produzem compostos orgânicos a partir de carbono inorgânico e da oxidação de compostos de enxofre libertados pelas chaminés. Estes seres vivem em simbiose com organismos mais desenvolvidos. Neste ecossistema invulgar, crescem também vermes tubulares (poliquetas tubulares), moluscos bivalves e espécies estranhas de caranguejos e de camarões.
GAVE
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Ardósia Filito Micaxisto Gnaisse
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