The nomenclature of intermediate and acid volcanic rocks presently used is based principally upon mineral association and the correlation between bulk chemistry and mineral assemblages has not received the attention it deserves. On the basis of well documented petrochemical data available on these roeks all over the world, the theoretical background is developed for a quantitative mincroehemieal classification of intermediate and acid volcanic rocks and its validity and advantages are evaluated. The proposed classification scheme is claimed to be helpful to throwing some light into the common features of these rocks and the relationships and gradations between the various representing members.
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