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- W2816064241 abstract "Abstract The true solubilities of highly siderophile elements in silicate and oxide minerals may be difficult to measure because of their low abundances and the tendency of these elements to occur as minute inclusions or “micronuggets”. In order to mitigate this latter problem, we present a new approach that makes use of the solid-state diffusion of such elements into pre-existing crystals. The diffusion of Rh, Ru and Ir was measured in San Carlos olivine, and synthetic monocrystalline forsterite and MgAl2O4-spinel, at atmospheric pressure, 1300 to 1400 °C and oxygen fugacities from air to that of the quartz-fayalite-magnetite (FMQ) oxygen buffer. The activities of all main components were controlled in each experiment by solid-state buffer assemblages: SiOR2R and MgO in olivine experiments were controlled by forsterite (olivine) + periclase (magnesiowustite) (fo + per or sco + mw), or forsterite (olivine) + protoenstatite (fo + en or sco + opx). Activities of AlR2ROR3R and MgO in the spinel experiments were buffered by spinel + periclase (sp + per) or spinel + corundum (sp + cor) mineral assemblages. The diffusion profiles were measured by LA-ICP-MS in both traverse and drilling modes, and by NanoSIMS. Good agreement was obtained between the methods with spatial resolution significantly higher in LA-ICP-MS drilling mode and NanoSIMS at 0.2 μm and 0.1 μm, respectively, compared to 5 μm by LA-ICP-MS in the traverse mode. Diffusion coefficients were more than five times slower, and solubilities five times lower, in the low MgO activity experiments compared with those carried out at high MgO activity at the same temperature and fO2. Our results show that at 1400PoPC and FMQ + 1.5 the maximum solubility of Rh in olivine in equilibrium with metal is 0.7 ppm in high SiOR2R activity mineral associations (those with orthopyroxene) and" @default.
- W2816064241 created "2018-07-19" @default.
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- W2816064241 date "2018-09-01" @default.
- W2816064241 modified "2023-10-18" @default.
- W2816064241 title "Diffusion and solubilities of Rh, Ru and Ir in olivine and spinel" @default.
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- W2816064241 doi "https://doi.org/10.1016/j.chemgeo.2018.07.009" @default.
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