Partitioning of elements between high-temperature, low-density aqueous fluid and silicate melt as derived from volcanic gas geochemistry

•Partition coefficients Kd for 58 elements are reported for volcanic gas – melt system.•Observed partition coefficients are almost indistinguishable from equilibrium ones.•Element properties, S and Cl contents and fO2 of the gas are factors to determine Kd. By comparing high-quality volcanic gas and...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2021-02, Vol.295, p.112-134
Main Authors: Zelenski, M., Simakin, A., Taran, Yu, Kamenetsky, V.S., Malik, N.
Format: Article
Language:English
Subjects:
Bubble growth
Diffusion
Element partitioning
Equilibrium
Silicate melt
Volcanic gas
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Summary:•Partition coefficients Kd for 58 elements are reported for volcanic gas – melt system.•Observed partition coefficients are almost indistinguishable from equilibrium ones.•Element properties, S and Cl contents and fO2 of the gas are factors to determine Kd. By comparing high-quality volcanic gas and whole rock compositions, we calculated the apparent (observed) mass partition coefficients Kd* for 58 elements on six basaltic volcanoes located in arc and rift/hotspot settings. The inferred Kd* vary from ∼1100 for sulfur to 0.0001 for zirconium, i.e., within seven orders of magnitude. Only 14 elements have Kd* > 1, including highly volatile S, Se, Te and halogens, as well as Tl, Re, Os, Bi, Cd, Au, In and As. Alkali metals have Kd* in the range from 0.1 for Cs to 0.01 for Na. Partition coefficients of other rock-forming elements are
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2020.12.011