Distinguishes five groups of rocks among inclusions in the lavas (pyroxene andesites) of the Pichincha volcano, a group of craters in the Quito area, Ecuador, discusses their significance for interpreting the nature of the basement, which does not outcrop in the area, and describes the contact metamorphic effects observed in both the inclusions and the enclosing rock. On the basis of andesite inclusions derived from an ancient flow, it is concluded that the evolution of the lavas is characterized by a decrease in the amphibole content.

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