Original paper

Discussion on the use of δ - Δ diagram in interpreting stable isotope data

Zheng, Yong-Fei

European Journal of Mineralogy Volume 4 Number 3 (1992), p. 635 - 644

27 references

published: Jun 11, 1992
manuscript accepted: Nov 25, 1991
manuscript received: May 29, 1991

DOI: 10.1127/ejm/4/3/0635

BibTeX file

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Abstract

Abstract The geometric nature of δ - Δ diagram is examined and data from some natural systems are reappraised in order to prove the usefulness of such a diagram in interpreting the stable isotope composition of coexisting mineral pairs which have contrasting isotopic behaviors. When a closed system of more than two phases (or species) is taken into account in representing the conversation of mass in δ - Δ space, no simple geochemical meaning can be derived from the intercept and slopes of correlation arrays. It is shown that contrasting correlation arrays on the δ - Δ diagram may indicate disequilibrium isotope exchange under relatively closed system conditions. On the other hand, correlation arrays with slope » 1 on a δ - δ diagram suggest equilibrium isotope exchange under open system conditions, and therefore fractionation Δ - values are capable of providing an isotopic geothermometry

Keywords

carbonoxygensulfurisotopic ratiosgraphical representationequilibriumdisequilibriummetamorphic rockshydrothermal ore deposits