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278-35-3,25-35 KT Feldspar-phyric basalt. 21% large phenocrysts of Plagioclase zoned from mottled cores of An 64 composition to An 30 rims. Most phenocryst compositions are in range An so55. Phenocrysts up to 3 mm in long dimension, often occurring in glomerophyric patches up to 5 mm in size. Many phenocrysts contain irregularshaped inclusions of devitrified dark brown glass. Vesicles are rare, usually rounded and rimmed by devitrified dark brown glass, fibrous antigorite, and filled with platy calcite. Irregular vesicles are partly to wholly filled with yellowish serpentine. Groundmass texture is intersertal with average grain size 75-100μ. Groundmass Plagioclase (An 45) occurs as fresh laths, interstitial pyroxene occurs as fibrous to skeletal, altered grains.

Volcanic Rocks from DSDP Leg 29: Petrography and Rare Earth Abundances