geo 9 rochas sedimentares (biogénicas)
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Rochas Sedimentares – Rochas Biogénicas
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A turfa é um material de origem vegetal, parcialmente decomposto, encontrado em camadas,
geralmente em regiões pantanosas e também sobre montanhas (turfa de altitude). É formada
principalmente por Sphagnum (esfagno, grupo de musgos) e Hypnum, mas também de juncos,
árvores, etc. Sob condições geológicas adequadas, transformam-se em carvão, através de
emanações de metano vindo das profundezas e da preservação em ambiente anóxico.
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A incarbonização ocorre ao abrigo do
ar, nela intervindo bactérias
anaeróbias.
Durante a incarbonização, devido a
reacções de redução, formam-se e
libertam-se dióxido de carbono,
metano e água.
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http://www.black-tides.com/uk/oil/what-is-oil/origin-oil-animation.php
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Resumo