| Text Description: |
Agglutinate from immediately above the lahar/pyroclastic flow at Site 5. The very base of the unit nA1. Fine-grained, vesicular, intersertal, hypocrystalline, seriate matrix of dark brown glass and skeletal plagioclase. There are rare granular masses of pyroxene. Plagioclase phenocrysts (An27 - An59) are up to 1.5 mm and some have complex zoning and/or sieve textured zones, many have tooth-like overgrowths, some have rounded rims. Orthopyroxene phenocrysts are up to 1.25 mm and occasionally have clinopyroxene rims or rarely have brown glass embayments, some are sieve textured, and some appear to have grown around or partially around plagioclase grains. Clinopyroxene phenocrysts are up to 0.3 mm. |