geo 14 génese das rochas magmáticas
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Génese das rochas magmáticas
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Numa rocha magmática, a génese dos diferentes minerais não é simultânea, porque os minerais têm diferentes temperaturas de cristalização.
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Tempo Espaço disponível Temperatura
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As partículas organizam-se ordenadamente nas diferentes direcções do espaço, o que determina um crescimento harmónico.
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Formada por Fiadas de partículas ordenadas ritmicamente segundo
diferentes direcções do espaço.
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Fluorite
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As propriedades físicas dos minerais resultam da sua composição química e das suas características estruturais.
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Clivagem na Fluorite
A clivagem ocorre paralelamente aos planos mais densos e com mais espaço
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Revela-nos que as forças de coesão do plano que se separam são muito fortes, enquanto as perpendiculares às mesmas são débeis.
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A forma poliédrica é uma consequência do arranjo interno das partículas.
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Euédrico
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Estrutura desordenada semelhante ao estado líquido.
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Moldavite –Vidro natural. Formado durante um impacto meteorítico
Vidro distorcido
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Olivina Piroxenas Anfíbolas Biotite
Plagioclases Moscovite Feldspato Quartzo
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Isos = mesmo + morphé = forma
Labradorite
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Forsterite Faialite
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Albite Anortite
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Polys = vários+ morphé = forma
Aragonite Calcite
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Granito
Xenólito
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Lavadores – Gaia - Xenólitos.
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Lavadores – Gaia - fenocristais rosados com uma orla exterior branca, representando uma textura rapakivi.
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Lavadores – Gaia – Filão. Filões róseos de grão fino que cortam o granito. Estas estruturas são em geral de pequena espessura, apresentando uma atitude horizontal ou levemente inclinadas (sub-horizontais) (Teixeira, 1970). A natureza destes filões é considerada aplítica ou aplito-pegmatítica e os minerais que os constituem são basicamente o feldspato e quartzo.
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Xenólito
Filão
Princípios :• Inclusão• Intersecção
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Estas estruturas que parecem demonstrar um fluxo magmático são caracterizadas pela disposição alternada de faixas escuras, essencialmente de constituição biotítica, e outras mais claras, assim como pela orientação de megacristais, alinhados de um modo concordante com as faixas mencionadas (Teixeira, 1970).
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Fluxo magmático caracterizad0 pela disposição alternada de faixas escuras, essencialmente de constituição biotítica, e outras mais claras, assim como pela orientação de megacristais, alinhados de um modo concordante com as faixas mencionadas (Teixeira, 1970).
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Lavadores - Gaia
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Olivina Piroxenas Anfíbolas Biotite
Plagioclases Moscovite Feldspato Quartzo
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Granito Róseo.Louvre. Paris
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