Figure F2. Oxide-quartz diorite (Thin Section 88; Sample 345-U1415K-2G-5, 14–18 cm [Piece 2]; Interval G77). Although not yet confirmed, clinopyroxene, orthopyroxene, and amphibole may be present as primary magmatic phases. The presence of interstitial quartz, iron oxide, and apatite suggests that the oxide-quartz diorite derived from a SiO2-rich melt. For details see Figure F3. A. Core close-up. B. Medium-grained oxide-quartz diorite with seriate and granular texture, consisting of plagioclase (gray crystals), quartz (white spots), oxides, and almost completely altered mafic minerals (dusty brownish/black masses; also includes oxides). Plane-polarized light. C. Under crossed polars.
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