Évaluation des filons de quartz pegmatitiques dans la région d'Akpet
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Cet ouvrage pr�sente une �valuation g�ologique et g�ochimique comparative des veines de pegmatite-quartz encaiss�es dans des granites dans les r�gions d'Akpet et de Betem, dans le sud-est du Nigeria, afin d'�valuer leur potentiel en tant que sources de quartz de haute puret� (HPQ). Des analyses min�ralogiques, g�ochimiques et statistiques ont �t� utilis�es pour d�terminer la gen�se, les niveaux d'impuret� et la viabilit� �conomique du quartz dans la r�gion, r�v�lant des environnements g�n�tiques distincts pour les sites: Les veines de quartz d'Akpet sont associ�es � des processus orog�niques, form�s dans des conditions de haute pression et de temp�rature mod�r�e pendant l'orogen�se panafricaine, tandis que le quartz de Betem est li� � des syst�mes �pithermaux, form�s � des pressions et des temp�ratures plus basses dans un environnement magmatique-hydrothermal peu profond. La g�ochimie des oligo-�l�ments indique des concentrations nettement plus faibles d'impuret�s telles que Al, Ti, Li et Fe dans le quartz d'Akpet que dans celui de Betem. Ces �l�ments sont essentiels pour d�terminer si le quartz convient aux industries de haute technologie. Ce livre aidera les d�butants en g�ochimie et en exploration min�rale � s'orienter dans cette discipline complexe mais int�ressante.
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