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Problems concerning the identification of basic volcanics


, : Problems concerning the identification of basic volcanics. Annales de la Societe Geologique de Belgique 90(7-10): 771-778

Two types of measurements are utilized in identifying fine-grained volcanic rocks: determinations of the mode, or observed mineral composition; and determinations of the norm, or calculated mineral composition. Measurements of the mode using polished thin sections and both reflected and transmitted light are recommended. They give considerably more accurate results than point counts of thin sections using transmitted light only. A new method of calculating the norm, the calculation of the stable mineral association, which is corrected for the actual chemical composition of each category of volcanics, gives better results than the C.I.P.W. classification. Norms calculated by the method of stable mineral association give results in very close agreement with modes derived from point counts using reflected and transmitted light.

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