Cr stable isotope fractionation by evaporation from silicate melts

Klemme, Stephan; Genske, Felix; Sossi, Paolo A.; Berndt, Jasper; Renggli, Christian J.; Stracke, Andreas

doi:10.1016/j.chemgeo.2022.121096

Cited by 5 publications

(1 citation statement)

References 67 publications

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“…Boron data were obtained using EMPA and LA-ICP-MS profiles (step size and profile lengths in the Supplement, Table S2) on the cross-sectioned samples of all experiments. Previous studies have reported the relative loss of trace elements as X t /X 0 and/or ln(X t /X 0 ), where X t is the content of the element in the final glass and X 0 the elemental content in the starting material (Sossi et al, 2019;Klemme et al, 2022;. In our study, the glasses were doped with ∼ 10 wt % B 2 O 3 , making it a major element in our starting material; hence true B loss cannot be simply described from X t /X 0 as it can for trace elements.…”

Section: Resultsmentioning

confidence: 99%

The effect of oxygen fugacity on the evaporation of boron from aluminoborosilicate melt

Flemetakis,

Renggli,

Pangritz

et al. 2024

Eur. J. Mineral.

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Abstract. We present the results of B2O3 evaporation experiments from Ca- and Mg-bearing aluminoborosilicate melts. Our experiments were conducted at 1245 to 1249 ∘C and 1350 to 1361 ∘C for different run times (60–1020 min), and at oxygen fugacities (logfO2) relative to the fayalite–magnetite–quartz (FMQ) buffer of FMQ−6 to FMQ+1.5, and in air. Our results show that with increasing fO2, evaporation of B from the melt increases by a factor of 5 compared to reducing conditions. Using Gibbs free energy minimization calculations, we suggest two possible evaporation reactions for B2O3 which constrain its speciation in the gas phase to be either 3+ or 4+ (B2O3(g) and BO2(g)). The measured B2O3 contents of the B evaporated residual glasses were used to calculate evaporation rate constants (ki) for B2O3 in oxidizing conditions (air, ki=2.09×10-4 cm min−1 at 1350 ∘C) and reducing conditions (FMQ−4, ki=4.46×10-5 cm min−1 at 1350 ∘C). The absence of diffusion profiles in the experimental glasses suggests that the evaporation rates are slower than B2O3 diffusion rates and therefore the rate-limiting process. Overall, the rate of B evaporation in air is approximately a factor of 5 higher compared to reducing conditions at FMQ−4.

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Section: Resultsmentioning

confidence: 99%

The effect of oxygen fugacity on the evaporation of boron from aluminoborosilicate melt

Flemetakis,

Renggli,

Pangritz

et al. 2024

Eur. J. Mineral.

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The origin of Na-alkaline lavas revisited: new constraints from experimental melting of amphibole-rich metasomes+lherzolite at uppermost mantle pressure

Grützner,

Prelević,

Berndt

et al. 2023

Contrib Mineral Petrol

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We present a new experimental dataset for reaction experiments between natural amphibole-clinopyroxene metasomes (hornblendite) and synthetic lherzolite that produced Na-rich alkaline melts. Experiments were conducted at 1, 3 and 4 GPa and 1000–1300 °C. The generated melts range from foidite over basanite to phonotephrite. At 1 GPa between 1000 and 1100 °C amphibole decompression-breakdown products generate a phonotephritic melt. Among the breakdown components rhönite was found to be stable up to 1100 °C and 1 GPa. At 3 and 4 GPa the melt compositions are affected by phlogopite melting and shift to more foiditic compositions. We find that the melting of hornblendites and the reaction of the melt with the lherzolite produce wehrlitic residues with different olivine/clinopyroxene ratios. Wehrlite formation does not always require separate metasomatic processes but can be a direct by-product of alkaline volcanism. We applied a metasome melting model to the magmas of the Kula volcanic province, Turkey, and show that at 1 GPa basanite melts and phonotephrite melts cover the whole range of known Kula lava compositions. The Kula lava compositional trend can be therefore generated by basanite-phonotephrite melt mixing. A comparison of high-pressure (3–4 GPa) melts with natural nephelinite data shows overlap with many major, minor, and trace elements but differences in SiO2, FeO, and TiO2 argue that the natural nephelinite data do not represent primary metasome melts.

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Non-traditional stable isotope geochemistry of oceanic basalts

Teng,

Williams

2025

Treatise on Geochemistry

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Cr stable isotope fractionation by evaporation from silicate melts

Cited by 5 publications

References 67 publications

The effect of oxygen fugacity on the evaporation of boron from aluminoborosilicate melt

The effect of oxygen fugacity on the evaporation of boron from aluminoborosilicate melt

The origin of Na-alkaline lavas revisited: new constraints from experimental melting of amphibole-rich metasomes+lherzolite at uppermost mantle pressure

Non-traditional stable isotope geochemistry of oceanic basalts

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