Oxygen fugacity dependence of Os solubility in haplobasaltic melt

Fortenfant, Sophie S.; Dingwell, Donald B.; Ertel-Ingrisch, Werner; Capmas, Françoise; Birck, J. L.; Dalpé, Claude

doi:10.1016/j.gca.2005.10.004

Cited by 35 publications

(13 citation statements)

References 32 publications

(80 reference statements)

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“…If indeed neutral HSE species existed in reduced silicate melts (Borisov et al, 1994;Cottrell and Walker, 2006), which is a minority view, then the presence of FeO (plus some FeO 1.5 ) would tend to destabilize these species relative to Pd cations (e.g. Brenan et al, 2003;Fortenfant et al, 2006;Ertel et al, 2006;Ertel et al, 2008;Yokoyama et al, 2009;Médard et al, 2010). In the intermediate pO 2 from FMQ to FMQ+2 where most natural basalts come to lie, our solubilities in FeO-bearing melt are higher than in AnDi.…”

Section: Discussionmentioning

confidence: 99%

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Solubility of palladium in picritic melts: 1. The effect of iron

Laurenz

Fonseca

Ballhaus

et al. 2010

Geochimica et Cosmochimica Acta

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In order to improve our understanding of HSE geochemistry, we evaluate the effect of Fe on the solubility of Pd in silicate melts. To date, experimentally determined Pd solubilities in silicate melt are only available for Fe-free anorthite-diopside eutectic compositions. Here we report experiments to study the solubility of Pd in a natural picritic melt as a function of pO 2 at 1300°C in a one atm furnace. Palladium concentrations in the run products were determined by laser-ablation-ICP-MS. Palladium increases from 1.07 ± 0.26 ppm at FMQ-2, to 306 ± 19 ppm at FMQ+6.6. At a relative pO 2 of FMQ the slope in log Pd concentration vs. log pO 2 space increases considerably, and Pd concentrations are elevated over those established for AnDi melt compositions. In the same pO 2 range, ferric iron significantly increases relative to ferrous iron. Furthermore, at constant pO 2 (FMQ+0.5) Pd concentrations significantly increase with increasing X FeO-total in the melt. Therefore, we consider ferric Fe to promote the formation of Pd 2+ enhancing the solubility of Pd in the picrite melt significantly. The presence of FeO in the silicate melt has proven to be an important melt compositional parameter, and should be included and systematically investigated in future experimental studies, since most natural compositions have substantial FeO contents.

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Section: Discussionmentioning

confidence: 99%

“…Previous experimental studies (Capobianco et al, 1993;Borisov et al, 1994Borisov et al, , 2004Borisov and Palme, 1995O'Neill et al, 1995;Capobianco and Hervig, 1996;Ertel et al, 1999Ertel et al, , 2001Ertel et al, , 2008Fortenfant et al, 2003Fortenfant et al, , 2006Cottrell and Walker, 2006;Righter et al, 2008;Yokoyama et al, 2009) …”

Section: Introductionmentioning

confidence: 99%

Solubility of palladium in picritic melts: 1. The effect of iron

Laurenz

Fonseca

Ballhaus

et al. 2010

Geochimica et Cosmochimica Acta

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“…Although the status of both Re and Os as highly siderophile elements (HSEs) is well established by experimental studies (e.g., Ertel et al, 2001;Fortenfant et al, 2006), it is still uncertain how these elements partition amongst sulphides, crystalline phases, and silicate melts. The compatible behaviour of Os during mantle melting seems to be caused by its retention in residual sulphide or metal alloy phases (e.g., Hart and Ravizza, 1996;Burton et al, 1999;Pearson et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…However, f O 2 is potentially an important variable because Re is a hetereovalent element dissolving in silicate melts as two different species (Re 4+ and Re 6+ ), with the changeover from the one Re oxidation state to the other occurring exactly over the range of redox conditions pertinent to the Earth's mantle (Ertel et al, 2001). It should be also noted that analysis of Re and other HSEs in experimental run products at geologically relevant f O 2 is extraordinarily difficult because of a seemingly unavoidable presence of sub-microscopic metallic particles known as micronuggets that can completely obscure the very low concentrations truly dissolved in silicate melts or crystals (see e.g., Ertel et al, 2001;Fortenfant et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The effect of oxygen fugacity on the partitioning of Re between crystals and silicate melt during mantle melting

Mallmann

O’Neill

2007

Geochimica et Cosmochimica Acta

134

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“…Quenched silicate runproducts from HSE solubility experiments performed at reducing conditions, however, often display evidence for contamination by dispersed HSE±Fe inclusions 17 . Despite the near ubiquity of these inclusions in low fO 2 experiments containing Pt, Ir, Os, Re and Ru, (e.g., [18][19][20][21][22][23][24][25][26][27] ), there is notable variability between studies in their textural presentation; compare for example references 22 and 26 . Although it has been demonstrated that inclusions can form which are a stable phase at the run conditions of an experiment 28 , this does not preclude the formation of inclusions as the sample is quenched.…”

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confidence: 99%

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Bennett

Brenan

Fei

2015

JoVE

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Estimates of the primitive upper mantle (PUM) composition reveal a depletion in many of the siderophile (iron-loving) elements, thought to result from their extraction to the core during terrestrial accretion. Experiments to investigate the partitioning of these elements between metal and silicate melts suggest that the PUM composition is best matched if metal-silicate equilibrium occurred at high pressures and temperatures, in a deep magma ocean environment. The behavior of the most highly siderophile elements (HSEs) during this process however, has remained enigmatic. Silicate run-products from HSE solubility experiments are commonly contaminated by dispersed metal inclusions that hinder the measurement of element concentrations in the melt. The resulting uncertainty over the true solubility and metal-silicate partitioning of these elements has made it difficult to predict their expected depletion in PUM. Recently, several studies have employed changes to the experimental design used for high pressure and temperature solubility experiments in order to suppress the formation of metal inclusions. The addition of Au (Re, Os, Ir, Ru experiments) or elemental Si (Pt experiments) to the sample acts to alter either the geometry or rate of sample reduction respectively, in order to avoid transient metal oversaturation of the silicate melt. This contribution outlines procedures for using the pistoncylinder and multi-anvil apparatus to conduct solubility and metal-silicate partitioning experiments respectively. A protocol is also described for the synthesis of uncontaminated run-products from HSE solubility experiments in which the oxygen fugacity is similar to that during terrestrial core-formation. Time-resolved LA-ICP-MS spectra are presented as evidence for the absence of metal-inclusions in run-products from earlier studies, and also confirm that the technique may be extended to investigate Ru. Examples are also given of how these data may be applied. Video LinkThe video component of this article can be found at

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Oxygen fugacity dependence of Os solubility in haplobasaltic melt

Cited by 35 publications

References 32 publications

Solubility of palladium in picritic melts: 1. The effect of iron

Solubility of palladium in picritic melts: 1. The effect of iron

The effect of oxygen fugacity on the partitioning of Re between crystals and silicate melt during mantle melting

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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