4-aula crosta litosférica
DESCRIPTION
Rochas MagmáticasTRANSCRIPT
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Crosta Continental
Profa.Dra. Larissa Marques Barbosa de Araujo
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INTRODUÇÃO
• No caso da Terra, considerando que é formada por envólucros concêntricos (atmosfera e hidrosfera – litosfera – calcosfera – siderosfera ou núcleo de ferro), Goldschmidt classificou os elementos de acordo com o seu principal invólucro de ocorrência (Fig. 1).
• Elementos atmófilos: ocorrem como gases na atmosfera. Ex.: Cl, N, H, gases nobres;• Elementos litófilos: concentram-se na crosta terrestre, tendem a formar silicatos, ou
estarem associados com eles, entre estes elementos dominam as ligações iônicas. Ex.: elementos alcalinos, alcalinos terrosos, Ti, Cr, Mn, Al, Terras Raras, V, Nb, Ta, Si, etc..;
• Elementos calcófilos: possuem afinidade pelo S concentrando-se como sulfetos. Formam ligações covalentes com o S, Se ou Te. Ex.: Cu, Pb, Zn, Ag, As,Sb, Cd, Bi, Hg, Ga, In, Tl, Se, Te;
• Elementos siderófilos: aqueles que tendem a se concentrar no núcleo terrestre, tem afinidade pelo ferro, em geral apresentam ligações metálicas e não tendem a se combinar com O ou S. Exs. Fe, Co, Ni, platinóides, C, P, Ge, Sn, Mo e Au.
• Figura 1 – Elementos com afinidade com a Terra e meteoritos. Áreas sobrepostas mostram elementos comuns em duas ou mais envólucros. O tamanho da letra mostra o elemento de maior concentração. Elementos em itálico são encontrados principalmente em fase ferrosa.
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DefiniçãoDefinição • Granulito (sensu stricto): Rocha metamórfica mais ou menos
bandada, constituída principalmente por grãos de quartzo e feldspatos como finos cristais irregulares, rodeando granadas de cor vermelho-palha. O granulito do distrito de Saxony na Alemanha é um exemplo típico, onde os granulitos pelas maior parte são de origem igneas correspondendo a granitos.
• Granulito (sensu lato): Rocha metamorfica de granulação média a grossa constituída principalmente por feldspatos associados com o quartzo e minerais ferromagnesianos anidros, compondo uma microestrutura granoblástica e estrutura de maciça a gnaissica. Os minerais presentes em um granulito variam de acordo com as condições (protólito, da temperatura e da pressão), ocorridas durante o metamorfismo. Um tipo comum de granulito contêm piroxenio, plagioclasio, feldspato e granada como acessório, óxidos e possíveis anfibólios. Minerais de clino e ortopiroxênio podem estar presentes em corpos de granulitos máficos, quando ocorrem juntos definem a fácies granulítica.
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C
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