Fig. 3: Effects of low-pressure accumulation and differentiation on V abundances in eclogite protoliths. | Nature Communications

Fig. 3: Effects of low-pressure accumulation and differentiation on V abundances in eclogite protoliths.

From: Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite

Fig. 3

Vanadium abundances (ppm) in a mid-ocean ridge basalts (MORB; yellow field71) and MOR gabbros (blue tristars, Eu/Eu* > 1.05; from PetDB: www.earthchem.org/petdb), and b reconstructed bulk compositions of eclogite xenoliths (X) and inclusions in diamond (DI) as a function of Al2O3/FeO. Eclogites with suggested gabbroic cumulate vs. melt protoliths, and those showing inferred anomalous enrichment, are indicated in b. Shown in a is the range of compositions for olivine+plagioclase accumulating from a parental melt formed at ∆logƒO2(FMQ) −2 to 0 (dark blue bar at bottom; modelling parameters and rationale in Methods; Supplementary Table 2). Vanadium abundances (ppm) in c MORB (yellow field) and MOR gabbros (blue tristars), and d reconstructed bulk eclogite xenoliths and DI as a function of molar Mg# (Mg/(Mg + Fetotal)), a proxy for the degree of differentiation during protolith formation. Eclogites with suggested less and more differentiated protoliths, and those showing inferred anomalous enrichment, are indicated in d. Error bars for reconstructed bulk rocks in b show average propagated 1σ uncertainties on V abundances of 29 ppm for xenoliths and 69 ppm for DI (Methods). Data sources in Supplementary Data 1.

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