Partition coefficients for Ni, Cu, Pd, Pt, Rh, and Ir between monosulfide solid solution and sulfide liquid and the formation of compositionally zoned Ni – Cu sulfide bodies by fractional crystallization of sulfide liquid

Barnes, Sarah‐Jane; Makovicky, Emil; Makovicky, M.; Rose-Hansen, J.; Karup-Møller, Sven

doi:10.1139/e17-032

Cited by 165 publications

(38 citation statements)

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“…The partition coefficients for Cu and Ni shown in Table 2 are similar to previously published data for the oxygen-free system Fe-Ni-Cu-S (e.g., Barnes et al, 1997). This is not surprising, in light of the exceedingly low O contents of Ni-and Cu-bearing liquids in our experiments even at f O 2 as high as QFM.…”

Section: Base Metal Partitioningsupporting

confidence: 91%

“…At high f O 2 (QFM) and high f S 2 (Pt-PtS), D Ni is much higher, and shows a moderate increase with decreasing temperature to reach a maximum of 0.90 at 950°C. It is likely that at slightly higher f S 2 or slightly lower temperature Ni would become compatible in mss, as has been shown in the oxygen-free system (e.g., Barnes et al, 1997).…”

Section: Base Metal Partitioningmentioning

confidence: 73%

“…Ni shows compatible behavior only under the most S-rich conditions at very low temperatures close to the solidus temperature of natural sulfide magmas. In general, the logarithms of partition coefficients appear to follow linear dependences on the sulfur content of the liquid (e.g., Barnes et al, 1997).…”

Section: Previous Workmentioning

confidence: 99%

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Partitioning of Cu, Ni, Au, and platinum-group elements between monosulfide solid solution and sulfide melt under controlled oxygen and sulfur fugacities

Mungall

Andrews

Cabri

et al. 2005

Geochimica et Cosmochimica Acta

199

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Abstract-We have performed six experiments in which we equilibrated monosulfide solid solution (mss) with sulfide melt in evacuated silica capsules containing solid buffers to fix oxygen and sulfur fugacity, at temperatures of 950°C, 1000°C and 1050°C at bulk concentrations of ϳ50 ppm for each of the PGE and Au, 5% Ni, and 7% Cu. Concentrations of O, S, Fe, Ni and Cu were determined by electron microprobe, whereas precious metal concentrations were determined by laser-ablation inductively-coupled mass spectrometry. Partition coefficients of all elements studied show minimal dependences on oxygen fugacity from the IW to the QFM buffers when sulfur fugacity is fixed at the Pt-PtS buffer. Cu, Pt, Pd and Au are strongly incompatible and Ru remains moderately to strongly compatible under all conditions studied. At all oxygen fugacities, at the Pt-PtS sulfur buffer, Ir and Rh remain highly compatible in mss. In the single run at both low oxygen and low sulfur fugacity Ir and Rh were found to be strongly incompatible in mss. At QFM and Pt-PtS the partition coefficient for Ni shows weak temperature dependence, ranging from 0.66 at 1050°C to 0.94 at 950°C. At lower oxygen and sulfur fugacity Ni showed much more incompatible behavior. Comparison with the compositions of sulfide ores from the Lindsley deposit of Sudbury suggests that the sulfide magma evolved under conditions close to the QFM and Pt-PtS buffers. The compatible behavior observed for Ni, Ir and Rh at Lindsley and most other magmatic sulfide deposits hosted by mafic rocks requires equilibration of mss and sulfide liquid at moderately high sulfur fugacity and low temperatures near to the solidus of the sulfide magma. We argue that this constraint requires that the sulfide magma must have evolved by equilibrium crystallization, rather than fractional segregation of mss as is commonly supposed.

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Section: Base Metal Partitioningsupporting

confidence: 91%

Section: Base Metal Partitioningmentioning

confidence: 73%

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Partitioning of Cu, Ni, Au, and platinum-group elements between monosulfide solid solution and sulfide melt under controlled oxygen and sulfur fugacities

Mungall

Andrews

Cabri

et al. 2005

Geochimica et Cosmochimica Acta

199

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“…The results for Ni and Cu were reported in Li et al (1996) and Barnes et al (1997b, Figure 2). In these papers it was shown that D mss/liq in the S-Fe-Ni-Cu-PGE system are similar to the values reported by Fleet and Pan (1994) and Ebel and Naldrett (1997) for the S-Fe-NiCu system.…”

Section: Nickel and Coppermentioning

confidence: 79%

“…These partition coefficients are important since they are used in models of a number of processes. The partitioning of metals between sulphide liquid and monosulphide solid solution (mss) could explain the compositional zonation Proton microprobe results for the partitioning of platinum-group elements between monosulphide solid solution and sulphide liquid observed in many magmatic sulphide ores (Barnes et al, 1997b and references therein). Bulanova et al (1996) have used D mss/liq to interpret the OsIrRu-enriched patterns they found in a sulphide inclusion in a kimberlite diamond.…”

Section: Introductionmentioning

confidence: 99%

Proton microprobe results for the partitioning of platinum-group elements between monosulphide solid solution and sulphide liquid

Barnes

Achterbergh

Makovicky

et al. 2001

South African Journal of Geology

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Partition coefficients (D) for Ni, Cu, and platinum-group elements (PGE) between monosulphide solid solution (mss) and Fe-sulphide liquid (liq) have been determined experimentally using an electron microprobe (EMP) to analyze experimental run products. The EMP detection limit is approximately 0.05 weight per cent for the PGE, consequently few results were obtained for Pt and Ir and the precision for Pd and Rh at low concentrations was poor. These run products have been reanalyzed using a proton microprobe (PMP), which has a detection limit between 10 and 50ppm for these elements.It is now clear that D mss/liquid for all the elements show a strong dependence on the S content of the run in S-undersaturated and S-saturated runs. However, in S-oversaturated runs the S content of the run does not appear to influence D mss/liq . The greater precision of the PMP data establishes that in S-oversaturated runs D mss/liq at 1000°C are consistently higher than those at 1100°C. In contrast, D mss/liq in the S-undersaturated and S-saturated runs are similar at both temperatures. This difference in behaviour is thought to arise because in the S-undersaturated and S-saturated runs the amount of S in the mss is controlled by the S content of the run. As the S content in the mss increases, the number of vacancies in the structure of the mss also increases, and D mss/liq rises. In contrast, in S-oversaturated runs the mss has absorbed the maximum amount of S and thus the S content of the run no longer influences the structure of the mss and hence does not control D mss/liq . Thus, the effect of temperature on D mss/liq only becomes apparent in the S-oversaturated runs. The tendency for Os, Ir, Ru and Rh to partition into mss and the exclusion of Cu, Pt and Pd from mss maybe used to explain a number of phenomena; the zonation of massive sulphide bodies, the tendency for Os, Ir, Ru and to a lesser extent Rh to be enriched in cumulates with minor sulphides, and the presence of two types of sulphides in mantle nodules (an Os-Ir -rich mss and Cu-Pd rich pentlandite).The tendency of sulphide liquids to crystallize RuOsIr and Pt-Fe minerals at low f S2 may explain the enrichment of RuOsIr in ultramafic mafic cumulate rocks in the following manner. Sulphide solubility increases as pressures falls. Thus, sulphide droplets in rising basalt magma could be partly resorbed. The PGM could crystallize from this liquid. If these PGM survive long enough, then they could be incorporated into the early cumulate phases such as olivine and chromite. This would explain both the presence of PGM in many olivine and chromite cumulates and the tendency of more evolved magmas to have high Pd/Ir ratios.

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The 187Re-187Os and 190Pt-186Os Radiogenic Isotope Systems: Techniques and Applications to Metallogenic Systems

Norman

2023

Mineral Resource Reviews

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Rhenium, Os, and Pt are redox sensitive elements that are concentrated in highly reducing environments such as those associated with black shales but mobile under more oxidizing conditions such as those associated with arc volcanism. They are chalcophile in many terrestrial ore-forming environments, and their isotopic systematics provide unique opportunities to date the formation of sulfide ore deposits and understand their petrogenesis. Fractional crystallization of magmatic sulfide ores generates primary variations in Re/Os and Pt/Os that allow mineral and whole rock isochron ages to be determined and discrimination of crustal and mantle sources based on initial Os isotopic compositions. Molybdenite is especially well suited for geochronology due to its high Re/Os and resistance to resetting. Rhenium concentrations in molybdenite tend to reflect the composition or provenance of the ore-forming fluids, with higher concentrations associated with more primitive sources or more oxidized fluids and lower concentrations with more evolved and/or reduced conditions, although local and regional factors also have a significant influence. Many studies have used pyrite for dating but its typically low Re concentration, variable initial Os isotopic composition (reflecting fluid mxing), and susceptibility to re-equilibration makes its use as a geochronometer problematic in many cases. Other sulfide minerals such as bornite and arsenopyrite have shown promise for Re–Os isotope geochronology but additional studies are needed to evaluate their broader applicability for dating of ore deposits. The isobaric beta decay of parent isotope 187Re to 187Os has restricted investigation of this system by microbeam techniques such as ion microprobe or laser ablation mass spectrometry, especially for geochronology. This requires either chemically processing the sample to separate the elements or novel techniques such as collision-cells that preferentially ionize the Re and Os during the analysis. Thermal ionization mass spectrometry (TIMS) and inductively-coupled plasma mass spectrometry (ICPMS) are the most widely applied techniques for Re-Pt-Os isotopic analyses. Specialized techniques for sample digestion to ensure redox equilibrium between Os in the sample and the isotopically enriched spikes used for isotope dilution measurements are typically required. This chapter briefly reviews development of the 187Re-187Os and 190Pt-186Os isotopic systems for earth science, physico-chemical controls on their behavior in ore-forming environments, and applications to metallogenic systems.

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Partition coefficients for Ni, Cu, Pd, Pt, Rh, and Ir between monosulfide solid solution and sulfide liquid and the formation of compositionally zoned Ni – Cu sulfide bodies by fractional crystallization of sulfide liquid

Cited by 165 publications

References 15 publications

Partitioning of Cu, Ni, Au, and platinum-group elements between monosulfide solid solution and sulfide melt under controlled oxygen and sulfur fugacities

Partitioning of Cu, Ni, Au, and platinum-group elements between monosulfide solid solution and sulfide melt under controlled oxygen and sulfur fugacities

Proton microprobe results for the partitioning of platinum-group elements between monosulphide solid solution and sulphide liquid

The 187Re-187Os and 190Pt-186Os Radiogenic Isotope Systems: Techniques and Applications to Metallogenic Systems

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