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Glassy basalt specimens from Hole 319A of DSDP Leg 34 have values identical with those of unaltered basalts dredged from mid-ocean ridges. Coarse-grained basalts are all slightly enriched in O owing to weathering, even though they appear fresh in hand specimen. The degree of weathering in Hole 319A, estimated according to the model of Muehlenbachs and Clayton (1972), increases from about 4% near the top to 11% near the bottom. The O content of all the samples is positively correlated with water content in a manner identical with that for weathered dredged basalts. Vein material is highly enriched in O and was probably precipitated from cold seawater. The degree of weathering is about the same for samples recovered from Hole 319A and Site 321.

Oxygen-Isotope Geochemistry of DSDP Leg 34 Basalts