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Browsing by Subject "amphiboles"

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    Item type:Article, Access status: Open Access ,
    Przeobrażenia amfiboli w porfirach ryodacytowych z Zalasu koło Krakowa
    (Wydawnictwa AGH, 2009) Marszałek, Mariola; Czerny, Jerzy
    The study was aimed at alteration of amphibole phenocrysts in the porphyries from Zalas. The alteration processes took place at the magmatic stage: development of orthopyroxenes and biotitization, and at the postmagmatic one: chloritization followed by argillitization and formation of feldspars, carbonate minerals, quartz, ilmenite, magnetite and hematite. Post-magmatic alteration resulted from hydrothermal processes of the metasomatic character.