Petrology of Basalts from Site 487 , Deep Sea Drilling Project Leg 66 , Middle America Trench Area off Mexico

Abstract

Basaltic rocks recovered at the Middle America Trench area off Mexico are typical plagioclase-olivine phyric abyssal tholeiites containing less than 0.2 wt.% K2O. Phenocrysts of plagioclase and olivine usually make up the aggregate. Plagioclase phenocrysts are Ca-rich and up to An^. Olivine phenocrysts, which are always attached to plagioclase phenocrysts… (More)

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