Experimental investigation of Ru isotope fractionation between metal, silicate and sulfide melts - Sorbonne Université
Journal Articles Chemical Geology Year : 2021

Experimental investigation of Ru isotope fractionation between metal, silicate and sulfide melts

Abstract

To improve the understanding of large-scale planetary processes, i.e. differentiation and core formation, of Earth and other planetary bodies, we performed experiments at 1 GPa in a range of 2 temperatures to investigate mass-dependent isotope fractionation of ruthenium (Ru) between metal, silicate, and sulfide melts. Metal silicate fractionation is Ru/ 99 Rusilicate-102 Ru/ 99 Rumetal = 0.02 ± 0.02 ‰ (95% confidence interval) at °C and therefore negligible for Earth's core formation. However, there is resolvable Ru isotope fractionation between liquid metal and liquid sulfide: The 102 Ru/ 99 Ru ratio of liquid sulfide is 0.11 ± 0.03 ‰ lighter than that of liquid metal at 1400 °C in sulfur (S)-bearing experiments. The unexpected lighter Ru isotope composition of the sulfide can be best explained with different Ru-S bonding environments. Our results show furthermore, that addition of tin (Sn) instead of S to experimental charges affects Ru isotope fractionation significantly. The 102 Ru/ 99 Ru ratios in the Sn-bearing phase are 0.18 ‰ ± 0.01 ‰ heavier than metal; hence, the presence of Sn not only changes the magnitude of the Ru isotope fractionation but also its direction. The observed Ru isotope fractionations are too small to preserve a resolvable isotope fractionation signature during core formation or the Hadean matte scenario at very high temperatures.
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Dates and versions

hal-03474539 , version 1 (10-12-2021)

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Tobias Grützner, Timo Hopp, Jasper Berndt, Arno Rohrbach, Stephan Klemme. Experimental investigation of Ru isotope fractionation between metal, silicate and sulfide melts. Chemical Geology, 2021, 580, pp.120384. ⟨10.1016/j.chemgeo.2021.120384⟩. ⟨hal-03474539⟩
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