The Temperature and Pressure Dependence of Nickel Partitioning between Olivine and Silicate Melt

Matzen, A. K.; Baker, M. B.; Beckett, J. R.; Stolper, Edward M.

doi:10.1093/petrology/egt055

Cited by 151 publications

(133 citation statements)

References 110 publications

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“…The duration of hightemperature runs (between 1500 and 1700 • C) was therefore between 1 h and 12 min with shortest run duration at 1700 • C. We did not observe any significant loss of Cu in our experiments, although up to 50% of Ni was lost when Ni was added as NiO or NiS. Ni-loss from graphite capsules was previously reported by Matzen et al (2013) and may have occurred, possibly due to formation of volatile Ni-carbonyl (Ni(CO) 4 ) during the experiment. To minimise Ni-loss, experiments with high concentrations of Ni (denoted NiI-J, in Table 1) generally had shorter durations (10-30 min).…”

Section: Experimental Methodssupporting

confidence: 67%

The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides

Kiseeva

Wood

2015

Earth and Planetary Science Letters

126

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We develop a comprehensive model to describe trace and minor element partitioning between sulphide liquids and anhydrous silicate liquids of approximately basaltic composition. We are able thereby to account completely for the effects of temperature and sulphide composition on the partitioning of Ag, Cd, Co, Cr, Cu, Ga, Ge, In, Mn, Ni, Pb, Sb, Ti, Tl, V and Zn. The model was developed from partitioning experiments performed in a piston-cylinder apparatus at 1.5 GPa and 1300 to 1700 • C with sulphide compositions covering the quaternary FeS-NiS-CuS 0.5 -FeO. Partitioning of most elements is a strong function of the oxygen (or FeO) content of the sulphide. This increases linearly with the FeO content of the silicate melt and decreases with Ni content of the sulphide. As expected, lithophile elements partition more strongly into sulphide as its oxygen content increases, while chalcophile elements enter sulphide less readily with increasing oxygen. We parameterised the effects by using the ε-model of non-ideal interactions in metallic liquids. The resulting equation for partition coefficient of an element M between sulphide and silicate liquids can be expressed aswhere A is a constant related to the entropy change of the partitioning reaction, B is a constant related to its enthalpy and n is the valency of the element of interest. Interaction parameters ε FeO , ε NiS and ε CuS 0.5 refer to non-ideal interactions between trace element and matrix, x FeO , x NiS , x CuS 0.5 and x FeS are mole fractions of FeO, NiS, and CuS 0.5 in sulphide and FeO corr is FeO content of silicate liquid (wt%) corrected for the ideal activity of FeS in the sulphide as follows:We find, for most elements, that the effect of Ni and Cu on partitioning is significantly smaller than the effect of oxygen. The effects of temperature are greatest for Ni, Cu and Ag. We used our model to calculate the amount of sulphide liquid precipitated along the liquid line of descent of MORB melts and find that 70% of silicate crystallisation is accompanied by ∼0.23% of sulphide precipitation. The latter is sufficient to control the melt concentrations of chalcophile elements such as Cu, Ag and Pb. Our partition coefficients and observed chalcophile element concentrations in MORB glasses were used to estimate sulphur solubility in MORB liquids. We obtained between ∼800 ppm (for primitive MORB) and ∼2000 ppm (for evolved MORB), values in reasonable agreement with experimentally-derived models. The experimental data also enable us to reconsider Ce/Pb and Nd/Pb ratios in MORB. We find that constant Ce/Pb and Nd/Pb ratios of 25 and 20, respectively, can be achieved during fractional crystallisation of magmas generated by 10% melting of depleted mantle provided the latter contains >100 ppm S and about 650 ppm Ce, 550 ppm Nd and 27.5 ppb Pb.Finally, we investigated the hypothesis that the pattern of chalcophile element abundances in the mantle was established by segregation of a late sulphide matte. Taking the elements Cu, Ag, Pb and Zn as 281 examples we find that th...

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Section: Experimental Methodssupporting

confidence: 67%

The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides

Kiseeva

Wood

2015

Earth and Planetary Science Letters

126

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“…In this model, we assume that a melt inclusion hosted within the highest-Fo olivine crystal (Fo = 89.6) represents the composition of the parental magma, and we use a rhyolite composition from Zhang et al (1994) to represent the composition of the crustal-derived melt. The Ni partition coefficient between olivine and melt (D Ni ) is calculated using the model of Matzen et al (2013), and anhydrous olivine liquidus temperatures are obtained using the model of Herzberg and Asimow (2015). Water depression on the olivine liquidus is calculated using the model of Médard and Grove (2008).…”

Section: Adakitic Hmas: a Crustal Process?mentioning

confidence: 99%

Hydrous orthopyroxene-rich pyroxenite source of the Xinkailing high magnesium andesites, Western Liaoning: Implications for the subduction-modified lithospheric mantle and the destruction mechanism of the North China Craton

Hong

Zhang

et al. 2017

Lithos

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“…Using olivine/silicate liquid partition coefficients for Ni of 3.8-5.9 (Matzen et al 2013;Gaetani and Grove 1997) and the typical Ni content of olivine from the Peridotite Zone (2600 ppm NiO: Raedeke 1982), the silicate magma in equilibrium with the olivine would have contained 440 to 680 ppm Ni. Using sulfide liquid/silicate liquid partition coefficients for Ni of 274-500 (Rajamani and Naldrett 1978;Peach et al 1990), sulfide liquid would contain ∼12-34 % Ni, and this would crystallize to form a sulfide assemblage containing ∼34-97 % pentlandite.…”

Section: Discussionmentioning

confidence: 99%

A study of the trace sulfide mineral assemblages in the Stillwater Complex, Montana, USA

et al. 2016

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The sulfide assemblages of the Stillwater Complex away from the well-studied ore zones are composed mainly of variable proportions of pyrrhotite, chalcopyrite, pentlandite, and ±pyrite. Excluding vein assemblages and those affected by greenschist and lower temperature alteration, the majority can be classified into two broad assemblages, defined here as pristine (multiphase, often globular in shape) or volatilebearing (multiphase, high-temperature, volatile-rich minerals such as biotite, hornblende, or an unmixed calcite-dolomite assemblage). The volatile-bearing assemblages are mainly found within and below the J-M reef, where native copper and sphalerite are also locally present. Pristine sulfides are found throughout the stratigraphy. Both groups can be affected by apparent S loss in the form of pyrite being converted to magnetite and chalcopyrite to a Cu-Fe-oxide (delafossite), with little to no silicate alteration. An upward trend from pentlandite-rich to pyrrhotite-rich to pyrite-rich assemblages is observed in the footwall rocks in upper GN-I, and the same trend repeats from just below the reef and continues into the overlying N-II and GN-II. Modeling suggests that the sulfide Ni in the Peridotite Zone is largely controlled by silicate Ni. When taken together, observations are most readily explained by the remobilization of selected elements by a hightemperature fluid with the apparent loss of S > Cu > Ni. This could concentrate ore metals by vapor refining, eventually producing a platinum group element-enriched sulfide ore zone, such as the J-M reef.

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The Temperature and Pressure Dependence of Nickel Partitioning between Olivine and Silicate Melt

Cited by 151 publications

References 110 publications

The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides

The effects of composition and temperature on chalcophile and lithophile element partitioning into magmatic sulphides

Hydrous orthopyroxene-rich pyroxenite source of the Xinkailing high magnesium andesites, Western Liaoning: Implications for the subduction-modified lithospheric mantle and the destruction mechanism of the North China Craton

A study of the trace sulfide mineral assemblages in the Stillwater Complex, Montana, USA

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