Lamprofírios mineralizados (Abu Rusheid - Sikait) no Egito

Lamprofírios mineralizados (Abu Rusheid - Sikait) no Egito

Mohamed Ibrahim

53,85 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Geología y la litosfera
ISBN:
9786206729068
53,85 €
IVA incluido
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Os diques de lamprofiros são caracterizados por estruturas em forma de caixa (armadilha física) preenchidas por mineralização proveniente do interior, e os seus feldspatos e micas são relativamente alterados para minerais argilosos (armadilha química). São comuns três fases: a primeira (fase de alta temperatura), caracterizada pela formação de Au e Ag nativos associados a minerais sulfurosos primários, tais como pirite, galena, cassiterite, litargirio e arsenopirite. A segunda fase (a temperaturas mais baixas) é caracterizada pela formação de minerais sulfatos secundários. A terceira fase está relacionada com a calcificação formada após o óxido (alteração supergênica) e é caracterizada pela formação de calcite e minerais de urânio.

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