Experimentally determined sulfur isotope fractionation between metal and silicate and implications for planetary differentiation

Labidi, Jabrane; Shahar, Anat; Losq, Charles Le; Hillgren, V. J.; Mysen, Bjørn O.; Farquhar, James

doi:10.1016/j.gca.2015.12.001

Cited by 44 publications

(23 citation statements)

References 53 publications

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“…Our results are also consistent with the S isotopic fractionation measured in primitive lunar mare basalts, that limits bulk Moon S degassing to less than 10% during the Moon-forming event 34 . Note that the heavier isotopic signature of S in lunar rocks may also be reconciled with preferential partitioning of S in the lunar core, as this would produce S isotopic fractionations of a similar magnitude 35 .…”

Section: Discussionmentioning

confidence: 97%

The lunar core can be a major reservoir for volatile elements S, Se, Te and Sb

Steenstra

Lin

Dankers

et al. 2017

Sci Rep

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The Moon bears a striking compositional and isotopic resemblance to the bulk silicate Earth (BSE) for many elements, but is considered highly depleted in many volatile elements compared to BSE due to high-temperature volatile loss from Moon-forming materials in the Moon-forming giant impact and/or due to evaporative loss during subsequent magmatism on the Moon. Here, we use high-pressure metal-silicate partitioning experiments to show that the observed low concentrations of volatile elements sulfur (S), selenium (Se), tellurium (Te), and antimony (Sb) in the silicate Moon can instead reflect core-mantle equilibration in a largely to fully molten Moon. When incorporating the core as a reservoir for these elements, their bulk Moon concentrations are similar to those in the present-day bulk silicate Earth. This suggests that Moon formation was not accompanied by major loss of S, Se, Te, Sb from Moon-forming materials, consistent with recent indications from lunar carbon and S isotopic compositions of primitive lunar materials. This is in marked contrast with the losses of other volatile elements (e.g., K, Zn) during the Moon-forming event. This discrepancy may be related to distinctly different cosmochemical behavior of S, Se, Te and Sb within the proto-lunar disk, which is as of yet virtually unconstrained.

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Section: Discussionmentioning

confidence: 97%

The lunar core can be a major reservoir for volatile elements S, Se, Te and Sb

Steenstra

Lin

Dankers

et al. 2017

Sci Rep

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“…This hypothesis was supported by subsequent laboratory experiments investigating sulfur isotopic fractionation between metal and silicate at high pressure (Labidi et al. ).…”

Section: Discussionmentioning

confidence: 63%

A new type of isotopic anomaly in shergottite sulfides

Franz

Farquhar

et al. 2019

Meteorit & Planetary Scien

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The isotopic composition and abundance of sulfur in extraterrestrial materials are of interest for constraining models of both planetary and solar system evolution. A previous study that included phase‐specific extraction of sulfur from 27 shergottites found the sulfur isotopic composition of the Martian mantle to be similar to that of terrestrial mid‐ocean ridge basalts, the Moon, and nonmagmatic iron meteorites. However, the presence of positive Δ33S anomalies in igneous sulfides from several shergottites, indicating incorporation of atmospherically processed sulfur into the subsurface, complicated this interpretation. The current study expands upon the previous work through analyses of 20 additional shergottites, enabling tighter constraints on the isotopic composition of juvenile Martian sulfur. The updated composition (δ34S = −0.24 ± 0.05‰, Δ33S = 0.0015 ± 0.0016‰, and Δ36S = 0.039 ± 0.054‰, 2 s.e.m.), representing the weighted mean for all shergottites within the combined population of 47 without significant Δ33S anomalies, strengthens our earlier result. The presence of sulfur isotopic anomalies in igneous sulfides of some meteorites suggests that their parent magmas may have assimilated crustal material. We observed small negative Δ33S anomalies in sulfides from two meteorites, NWA 7635 and NWA 11300. Although negative Δ33S anomalies have been observed in nakhlites and ALH 84001, previous anomalies in shergottites have all shown positive values of Δ33S. Because NWA 7635 has formation age of 2.4 Ga and is much more ancient than shergottites analyzed previously, this finding expands our perspective on the continuity of Martian atmospheric sulfur photochemistry over geologic time.

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“…This is analogous to the different distribution of alkali metals among structural units, for example (Maekawa et al, 1991). Such structural complexity, in turn, may affect other isotopic systems for which the isotopes interact with the Q n units as reported, for example, for 15 N/ 14 N (Mysen and Fogel, 2010), for 13 C/ 12 C (Mysen et al, 2009), or for the isotopes of S (Labidi et al, 2016). Therefore, it might have played an important influence on the geochemical isotopic record used to reconstruct the history of the Earth and other silicate planets.…”

Section: Discussionmentioning

confidence: 91%

“…For example, the partitioning of 15 N/ 14 N, of 13 C/ 12 C, and of 2 H/ 1 H between sodium silicate melts and aqueous fluids depends on the melt structure (Mysen et al, 2009;Mysen and Fogel, 2010). The 34 S/ 32 S fractionation between aluminosilicate melts and metals also depends on the proportion of network formers Al 3+ or B 3+ in the melts (Labidi et al, 2016). Further, the behaviour of Fe isotopes in silicate melts is affected by the effects of melt composition on the Fe environment (Dauphas et al, 2014).…”

mentioning

confidence: 99%