Figure F12. Typical mineralogy and textures of lower series lavas. A. Highly olivine phyric basalt (Sample 163X-SEG76B-1-1, 0–4 cm). Equant to elongate olivine phenocrysts with chromian-spinel inclusions are completely replaced. B. Laths of plagioclase and prismatic olivine with inclusions of chromian-spinel replaced by iddingsite in a very fine grained groundmass of plagioclase, Fe-Ti oxides, and altered mesostasis (Sample 163X-SEG77A-1-1, 22–26 cm). C. Olivine-plagioclase-clinopyroxene phyric basalt (Sample 163X-SEG43A-1-1, 11–15 cm). Olivine altered to iddingsite, whereas clinopyroxene is fresh. D. Vesicular and aphyric basalt (Sample 163X-SEG76A-1-1, 8–10 cm). Note vesicles are either open or filled by gray clay.

Figure F12. Typical mineralogy and textures of lower series lavas. A. Highly olivine phyric basalt (Sample 163X-SEG76B-1-1, 0–4 cm). Equant to elongate olivine phenocrysts with chromian-spinel inclusions are completely replaced. B. Laths of plagioclase and prismatic olivine with inclusions of chromian-spinel replaced by iddingsite in a very fine grained groundmass of plagioclase, Fe-Ti oxides, and altered mesostasis (Sample 163X-SEG77A-1-1, 22–26 cm). C. Olivine-plagioclase-clinopyroxene phyric basalt (Sample 163X-SEG43A-1-1, 11–15 cm). Olivine altered to iddingsite, whereas clinopyroxene is fresh. D. Vesicular and aphyric basalt (Sample 163X-SEG76A-1-1, 8–10 cm). Note vesicles are either open or filled by gray clay.