NDLI: PHASE SEPARATION IN (Fe,Co)1−xS MONOSULFIDE SOLID-SOLUTION BELOW 450°C, WITH CONSEQUENCES FOR COEXISTING PYRRHOTITE AND PENTLANDITE IN MAGMATIC SULFIDE DEPOSITS

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PHASE SEPARATION IN (Fe,Co)1−xS MONOSULFIDE SOLID-SOLUTION BELOW 450°C, WITH CONSEQUENCES FOR COEXISTING PYRRHOTITE AND PENTLANDITE IN MAGMATIC SULFIDE DEPOSITS

Content Provider	Semantic Scholar
Author	Farrell, Shannon P. Fleet, Michael E.
Copyright Year	2002
Abstract	Phase relations for (Fe,Co) 1‐xS coexisting with cobalt pentlandite have been studied up to 450 °C using sealed silica glass tube experiments. The (Fe,Co) monosulfide solid-solution with the NiAs-type structure (Fe,Co- mss) unmixes abruptly below 425°C, to coexisting Fe-rich (Fe,Co-mss1; 1C structure) and Co-rich (Fe,Co- mss2; 3C structure) phases. For bulk compositions with 52.0 at.% S, the equilibrium Fe,Co-mss1 solvus is located at about 0.83 molar Fe/(Fe + Co) at 400 °C and progressively diverges toward the Fe1‐xS end-member composition with decrease in temperature to 0.98 molar Fe/(Fe + Co) at 105 °C. At 400°C, the equilibrium Fe,Co-mss2 solvus is at about 0.37 molar Fe/(Fe + Co) and does not appear to vary significantly with decrease in temperature. There is a metastable solvus within the equilibrium miscibility-gap, with a critical temperature at 425 °C between 0.45 and 0.50 molar Fe/(Fe + Co), as indicated by single-phase products that persist even with prolonged annealing. A narrow field of spontaneous phase-separation is centered at 0.75 molar Fe/(Fe + Co), and results in satellite reflections of h0l NiAs-type subcell reflections in products quenched from a high temperature (800 °C). The miscibility gap in Fe,Co-mss is similar to the phase separation of mss in the system Fe‐Ni‐S. However, phase separation occurs at a slightly higher temperature in Fe,Co-mss (between 425 and 400°C) than in mss (between 400 and 300°C), and is initially discontinuous.
Starting Page	33
Ending Page	46
Page Count	14
File Format	PDF HTM / HTML
DOI	10.2113/gscanmin.40.1.33
Volume Number	40
Alternate Webpage(s)	http://rruff.info/doclib/cm/vol40/CM40_33.pdf
Alternate Webpage(s)	https://doi.org/10.2113/gscanmin.40.1.33
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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