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Abstract
The alkali feldspar phenocrysts of certain granitic rocks include zonally arranged, oriented plagioclase crystals. The oriented plagioclase inclusions are commonly euhedral with oscillating zoning, suggesting a magmatic origin for both the inclusions and the alkali feldspar hosts. In a porphyritic quartz monzonite in the Okanogan Range, Washington, the rims of oriented plagioclase inclusions are systematically more sodic outward from the core of the alkali feldspar hosts. This trend plus other characteristics of the oriented phenocrysts indicate growth in a silicate melt.
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