Figure F9. Photomicrographs showing examples of quench textures in fine-grained mafic rocks from Unit I. A. Skeletal plagioclase microlites with "hopperlike" crystal habit in spherulitic diabase (Sample 209-1272A-7R-1, 113–115 cm) (cross-polarized light [XPL]: condenser lens; field of view [FOV] = 0.7 mm; image 1272A_028). B. Hollow olivine microlite and plagioclase microlites with swallow tails indicate quench crystallization in the groundmass of spherulitic diabase (Sample 209-1272A-7R-1, 87–89 cm) (XPL: condenser lens; FOV = 0.7 mm; image 1272A_024). C. Very fine hairlike crystals are interwoven in the groundmass of spherulitic diabase (Sample 209-1272A-7R-1, 87–89 cm) (plane-polarized light: condenser lens; FOV = 0.7 mm; image 1272A_023). D. Interpenetrating blades of plagioclase crystals forming a spinnifex-like texture (Sample 209-1272A-7R-1, 113–115 cm) (XPL: condenser lens; FOV = 1.4 mm; image 1272A

Figure F9. Photomicrographs showing examples of quench textures in fine-grained mafic rocks from Unit I. A. Skeletal plagioclase microlites with "hopperlike" crystal habit in spherulitic diabase (Sample 209-1272A-7R-1, 113–115 cm) (cross-polarized light [XPL]: condenser lens; field of view [FOV] = 0.7 mm; image 1272A_028). B. Hollow olivine microlite and plagioclase microlites with swallow tails indicate quench crystallization in the groundmass of spherulitic diabase (Sample 209-1272A-7R-1, 87–89 cm) (XPL: condenser lens; FOV = 0.7 mm; image 1272A_024). C. Very fine hairlike crystals are interwoven in the groundmass of spherulitic diabase (Sample 209-1272A-7R-1, 87–89 cm) (plane-polarized light: condenser lens; FOV = 0.7 mm; image 1272A_023). D. Interpenetrating blades of plagioclase crystals forming a spinnifex-like texture (Sample 209-1272A-7R-1, 113–115 cm) (XPL: condenser lens; FOV = 1.4 mm; image 1272A_030).