Figure F2. Backscattered electron imaging photomicrographs of microstructure of host rock and chilled margins. A. Fine- to medium-grained subophitic texture with clinopyroxene (CPX) and feldspar (anorthite is slightly lighter gray than albite [Ab]) (Sample 309-1256D-136R-1, 4–6 cm). Interstitial secondary minerals include sphalerite (ZnS) and calcite (Cte). B. Actinolite (Act) and mixed albite and anorthite (Ab-An) feldspars with interstitial FeO (Sample 312-1256D-187R-1, 75–77 cm). C. Chilled margin (top right) (Sample 309-1256D-136R-1, 4–6 cm). D. Finely mixed clinopyroxene and albite in a chilled margin (Sample 309-1256D-136R-1, 4–6 cm). E. Mixed clinopyroxene and mixed albite-anorthite within the chilled margin (Sample 309-1256D-161R-2, 6–8 cm). F. Banding in a chilled margin defined by variations in Fe concentration in actinolite, determined by electron dispersive spectroscopy (Sample 309-1256D-143R-1, 34–38 cm).
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