| Text Description: |
A 15-20’ thick flow with thick rubble zones and a 5-10’ thick massive zone at Site 3. Fine-grained, vesicular, weakly diktytaxitic, holocrystalline, intergranular, seriate porphyritic with a matrix of mesostasis, opaque, clinopyroxene, plagioclase, orthopyroxene?, yellow alteration and calcite. Plagioclase phenocrysts (An35 - An57) are up to 1.2 mm and a few of the larger grains have sieve textured intermediate zones, some have complex zoning, and rarely have resorbed rims or orthopyroxene inclusions. Orthopyroxene phenocrysts are up to 0.65 mm, and display thin clinopyroxene rims, and sparse opaque inclusions. Clinopyroxene phenocrysts are up to 0.15 mm. Opaque phenocrysts are up to 0.7 mm. |