Figure F5. Typical mineralogy and textures of Transect EG68 lavas. A. Highly plagioclase-clinopyroxene phyric basalt with glomerocrysts of plagioclase and phenocrysts of clinopyroxene in a relatively fresh, fine-grained groundmass of plagioclase, clinopyroxene, Fe-Ti oxides, and mesostasis (Sample 163X-SEG05B-1-1, 41–45 cm). B. Plagioclase-olivine phyric basalt with a fine-grained groundmass of plagioclase, clinopyroxene, and Fe-Ti oxides. Euhedral olivine phenocrysts are completely replaced by iddingsite. Chromian spinel occurs as <0.1-mm-sized inclusions in the olivine (Sample 163X-SEG12A-1-1, 0–4 cm). C. Fine-grained, highly plagioclase-clinopyroxene phyric to glomerophyric and seriate basalt. Groundmass composed of fresh plagioclase, clinopyroxene, Fe-Ti oxides, and trace amounts of mesostasis. Tear drop–shaped vesicle filled by yellow to gray clay (Sample 163X-SEG11A-1-1, 11

Figure F5. Typical mineralogy and textures of Transect EG68 lavas. A. Highly plagioclase-clinopyroxene phyric basalt with glomerocrysts of plagioclase and phenocrysts of clinopyroxene in a relatively fresh, fine-grained groundmass of plagioclase, clinopyroxene, Fe-Ti oxides, and mesostasis (Sample 163X-SEG05B-1-1, 41–45 cm). B. Plagioclase-olivine phyric basalt with a fine-grained groundmass of plagioclase, clinopyroxene, and Fe-Ti oxides. Euhedral olivine phenocrysts are completely replaced by iddingsite. Chromian spinel occurs as <0.1-mm-sized inclusions in the olivine (Sample 163X-SEG12A-1-1, 0–4 cm). C. Fine-grained, highly plagioclase-clinopyroxene phyric to glomerophyric and seriate basalt. Groundmass composed of fresh plagioclase, clinopyroxene, Fe-Ti oxides, and trace amounts of mesostasis. Tear drop–shaped vesicle filled by yellow to gray clay (Sample 163X-SEG11A-1-1, 11–15 cm).