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

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Title: Experimental investigation of Ru isotope fractionation between metal, silicate and sulfide melts.
Authors: Grützner, Tobias1,2 (AUTHOR) tobias.grutzner-handke@sorbonne-universite.fr, Hopp, Timo3,4 (AUTHOR) hopp@uchicago.edu, Berndt, Jasper2 (AUTHOR) jberndt@wwu.de, Rohrbach, Arno2 (AUTHOR) arno.rohrbach@wwu.de, Klemme, Stephan2 (AUTHOR) stephan.klemme@wwu.de
Source: Chemical Geology. Oct2021, Vol. 580, pN.PAG-N.PAG. 1p.
Subjects: Isotopic fractionation, Siderophile elements, Earth's core, Liquid metals, Metal sulfides, Metals, Tin
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 temperatures to investigate mass-dependent isotope fractionation of ruthenium (Ru) between metal, silicate, and sulfide melts. Metal silicate fractionation is 102Ru/99Ru silicate - 102Ru/99Ru metal = 0.02 ± 0.02‰ (95% confidence interval) at 1600 °C and therefore negligible for Earth's core formation. However, there is resolvable Ru isotope fractionation between liquid metal and liquid sulfide: The 102Ru/99Ru 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 102Ru/99Ru 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. [ABSTRACT FROM AUTHOR]
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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 temperatures to investigate mass-dependent isotope fractionation of ruthenium (Ru) between metal, silicate, and sulfide melts. Metal silicate fractionation is 102Ru/99Ru silicate - 102Ru/99Ru metal = 0.02 ± 0.02‰ (95% confidence interval) at 1600 °C and therefore negligible for Earth's core formation. However, there is resolvable Ru isotope fractionation between liquid metal and liquid sulfide: The 102Ru/99Ru 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 102Ru/99Ru 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. [ABSTRACT FROM AUTHOR]
ISSN:00092541
DOI:10.1016/j.chemgeo.2021.120384