Abstract
It has been shown in numerous studies that terrestrial rocks and minerals fall on a line with slope ∼0.52 in a δO17 vs. δO18 diagram. In this study, we present new data on the triple isotope composition of the Earth mantle, crustal materials and low-T aqueous precipitates. Crustal materials show distinct variations in ΔO17 suggesting that the concept of a single terrestrial mass fractionation is invalid on small-scale. Observable variations in individual fractionation slopes θ are interpreted as temperature effects. We show that the Earth mantle is isotopically homogeneous and confirm the recent finding that the Earth mantle has a negative ΔO17. The difference in δO18 and ΔO17 between seawater and oceanic crust is discussed with respect to the effects of low- and high-temperature water–rock interaction.
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