TY - JOUR

T1 - Behavior of Noble Metals during Fractional Crystallization of Cu–Fe–Ni–(Pt, Pd, Rh, Ir, Ru, Ag, Au, Te) Sulfide Melts

AU - Sinyakova, E.F.

AU - Ulybin, D.A.

AU - Kokh, K.A.

AU - Kuzmin, I.A.

N1 - Behavior of Noble Metals during Fractional Crystallization of Cu–Fe–Ni–(Pt, Pd, Rh, Ir, Ru, Ag, Au, Te) Sulfide Melts / E.F. Sinyakova, D.A. Ulybin, K.A. Kokh, I.A. Kuzmin // Russian Geology and Geophysics. - 2025.- Т. 66. - № 10. - С. 1253–1270. DOI 10.2113/rgg20254888. This work was financially supported by the Russian Science Foundation, project No. 25-27-00152.

PY - 2025/10/1

Y1 - 2025/10/1

N2 - The quasi-equilibrium directional crystallization method to model a new type of zoning in the Cu–Fe–Ni–S system was applied. A melt is crystallized with the following composition (in at.%): 14.00 Cu, 30.00 Fe, 4.00 Ni, 51.00 S, and 0.1 each of Pt, Pd, Ag, Au, As, Te, Bi, Pb, Se, and Sn. We use optical and electron microscopy, micro-X-ray spectral analysis, differential thermal analysis, and powder diffraction to study the composition and structure of the ingot. Based on the results of measuring the average solid phase composition, the distribution curves of macrocomponents in the ingot have been constructed in the range of g from 0 to 0.81 (g is the fraction of crystallized melt). The variations in the melt composition and distribution coefficients between solid phases and the melt in directional crystallization have also been calculated. The obtained sample consists of three primary zones: monosulfide solid solution with the composition ranging from (Fe0.75Ni0.10Cu0.06)0.91S to (Fe0.69Ni0.15Cu0.09)0.93S (Mss) in Zone I and two intermediate solid solutions: ~ (Fe0.57Ni0.03Cu0.45)1.05S (Iss1) in Zone II and (Fe0.46Ni0.06Cu0.52)1.05S (Iss2) in Zone III. The peritectic character of the crystallization of Iss1 and Iss2 from the melt has been established. The trajectories of the melt and solid phase compositions and series of conodes have been plotted for Mss and Iss1 on the phase diagram of the Cu–Fe–Ni–S system. Secondary zonality is described by the following sequence of phases: Pyh 1C + Pyh 3C + Icb + Ccp/Ccp + Iss + Fe-Pn, Sgk/Ccp + Ni-Pn + NiS + Bn (Pyh – hexagonal pyrrhotite, Icb – isocubanite, Ccp – chalcopyrite, Pn – pentlandite, Sgk – sugakiite, Bn – bornite) and belongs to the high-sulfur pyrrhotite + cubanite–chalcopyrite type of ore body zonation.

AB - The quasi-equilibrium directional crystallization method to model a new type of zoning in the Cu–Fe–Ni–S system was applied. A melt is crystallized with the following composition (in at.%): 14.00 Cu, 30.00 Fe, 4.00 Ni, 51.00 S, and 0.1 each of Pt, Pd, Ag, Au, As, Te, Bi, Pb, Se, and Sn. We use optical and electron microscopy, micro-X-ray spectral analysis, differential thermal analysis, and powder diffraction to study the composition and structure of the ingot. Based on the results of measuring the average solid phase composition, the distribution curves of macrocomponents in the ingot have been constructed in the range of g from 0 to 0.81 (g is the fraction of crystallized melt). The variations in the melt composition and distribution coefficients between solid phases and the melt in directional crystallization have also been calculated. The obtained sample consists of three primary zones: monosulfide solid solution with the composition ranging from (Fe0.75Ni0.10Cu0.06)0.91S to (Fe0.69Ni0.15Cu0.09)0.93S (Mss) in Zone I and two intermediate solid solutions: ~ (Fe0.57Ni0.03Cu0.45)1.05S (Iss1) in Zone II and (Fe0.46Ni0.06Cu0.52)1.05S (Iss2) in Zone III. The peritectic character of the crystallization of Iss1 and Iss2 from the melt has been established. The trajectories of the melt and solid phase compositions and series of conodes have been plotted for Mss and Iss1 on the phase diagram of the Cu–Fe–Ni–S system. Secondary zonality is described by the following sequence of phases: Pyh 1C + Pyh 3C + Icb + Ccp/Ccp + Iss + Fe-Pn, Sgk/Ccp + Ni-Pn + NiS + Bn (Pyh – hexagonal pyrrhotite, Icb – isocubanite, Ccp – chalcopyrite, Pn – pentlandite, Sgk – sugakiite, Bn – bornite) and belongs to the high-sulfur pyrrhotite + cubanite–chalcopyrite type of ore body zonation.

KW - СИСТЕМА CU-FE-NI-S

KW - ФАЗОВЫЕ РАВНОВЕСИЯ

KW - ЗОНАЛЬНОСТЬ

KW - ФРАКЦИОННАЯ КРИСТАЛЛИЗАЦИЯ

UR - https://www.scopus.com/pages/publications/105020730708

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001565406600001

UR - https://www.elibrary.ru/item.asp?id=82559823

UR - https://www.mendeley.com/catalogue/3650865f-bbcf-340f-b42c-7a4290aa0aa9/

U2 - 10.2113/rgg20254888

DO - 10.2113/rgg20254888

M3 - Article

VL - 66

SP - 642

EP - 661

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 10

ER -