| Reference Type | Journal (article/letter/editorial) |
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| Title | Phase relations in the metal-rich portions of the phase system Pt-Ir-Fe-S at 1000°C and 1100°C |
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| Journal | Mineralogical Magazine |
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| Authors | Makovicky, E. | Author |
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| Karup-Møller, S. | Author |
| Year | 2000 (December) | Volume | 64 |
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| Page(s) | 1047-1056 | Issue | 6 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/002646100550047Search in ResearchGate |
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| Mindat Ref. ID | 243240 | Long-form Identifier | mindat:1:5:243240:7 |
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| GUID | 896284e4-427e-4fbb-9ae9-8612fa47ee2b |
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| Full Reference | Makovicky, E., Karup-Møller, S. (2000) Phase relations in the metal-rich portions of the phase system Pt-Ir-Fe-S at 1000°C and 1100°C. Mineralogical Magazine, 64 (6) 1047-1056 doi:10.1180/002646100550047 |
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| Plain Text | Makovicky, E., Karup-Møller, S. (2000) Phase relations in the metal-rich portions of the phase system Pt-Ir-Fe-S at 1000°C and 1100°C. Mineralogical Magazine, 64 (6) 1047-1056 doi:10.1180/002646100550047 |
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| Abstract/Notes | AbstractPhase relations in the S-poor portions of the dry condensed Pt-Ir-Fe-S system were determined at 1000° and 1100°C with a particular emphasis on delineation of the solid solubility fields of the Pt-Ir-Fe alloys. At both temperatures, a broad field of γ(Ir,Fe,Pt) alloy coexists with γ-(Pt,Fe), Pt3Fe and PtFe which dissolve respectively at least 5.1, 29.3 and 24.0 at.% Ir at 1100°C (2.2, 23.6 and ≤17.2 at.% Ir at 1000°C). Gaps between the nearly Ir-free Pt-Fe alloys γ(Pt,Fe), Pt3Fe s.s., PtFe s.s. and γ(Fe,Pt) were estimated as 20–23 at.%, 40–42 at.% and 54.2–~57 at.% Fe at 1100°C (18–23, 39.5–42.5 and 59–62 at.% Fe at 1000°C). The first gap agrees with data from natural phases by Cabri et al. (1996). The Fe-rich sulphide melt dissolves only traces of Pt and Ir; Fe1–xS dissolves up to 5.8 at.% Ir at 1100°C and 3.4 at.% Ir at 1000°C. These solubilities and the compositions of coexisting alloys (before low-temperature exsolution) may serve as geothermometers. The S-rich melt dissolves up to 8.2 at.% Pt and 2.5 at.% Ir (measured on a solidified melt) at 1100°C. The Fe-Ir thiospinel dissolves up to 2.2 at.% Pt (for the composition Fe21.6Ir18.9Pt2.2S57.3 at 1100°C). The 25–28 at.% Fe portions of Pt3Fe with <10 at.% Ir partake in all important sulphide (± melt)-alloy assemblages (with PtS, Ir2S3, pyrrhotite, S-rich melt and thiospinel). Therefore, their use in recognizing distinct natural assemblages of genetic importance is of limited value. |
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