Figure F125. A. Example of composite alteration halo; inner light green alteration halo 100% recrystallized into chlorite/saponite (green), minor actinolite (brownish), and titanite (small, isolated crystals) (Thin Section 89; Sample 309-1256D-128R-1, 6–12 cm) (field of view [FOV] = 2.5 mm; plane-polarized light). No fresh titanomagnetite is preserved. Upper quarter of image is part of the outer dark green halo, where titanomagnetite is still present. B. Example of composite alteration halo; inner light green alteration halo 100% recrystallized into chlorite/saponite (green), minor actinolite (brownish), and titanite (small, isolated crystals) (Thin Section 89; Sample 309-1256D-128R-1, 6–12 cm) (FOV = 2.5 mm; cross-polarized light). No fresh titanomagnetite is preserved. The upper quarter of the image is part of the outer dark green halo, where titanomagnetite is still present.
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