Equilibria between iron-nickel olivines and iron-nickel sulfides
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Equilibria between iron-nickel olivines and iron-nickel sulfides

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Published .
Written in English


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Pagination1 v.
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Open LibraryOL18062653M

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  We show in Figs. 2 and 3 the results for one hundred and eighty-six iron and iron-nickel sulfides in thirty different hy- drated and anhydrous chondritic IDPs. We analyzed sulfides between 15 and /zm in by: Get an answer for 'Equation for the reaction between iron and nickel sulphate.' and find homework help for other Science questions at eNotes. Zinc metal found (obtain) in many forms like granules, foil, dust and in a powder form. After iron, Zinc metal the second most abundant element in the earth crust.   The equilibrium nickel distributions between oliv ine and Fe-Ni alloy are shown in Figure 2(b). The The actual nickel recovery from the olivine phase m easured using EPMA was (18%); this is .

Terrestrial Iron-nickel is very rare. Iron-nickel Meteorites are also rare, but are far more common than terrestrial Iron-nickel. Because there is an abundance of iron and nickel compounds, Iron-nickel is not used as an ore of either iron or nickel. Iron-nickel in all forms is valued as a rare collectors item, and meteorites are especially popular among collectors. In order to better understand the behaviour of nickel in magmatic processes, we have measured the apparent equilibrium constant (KD) for the exchange of Fe and Ni between coexisting olivine and. Abstract. Equilibration of natural olivine with (Fe, Ni)S in sealed silica glass tubes yields a value for the distribution constant for Ni/Fe exchange (K D 3) of ±, for 1,° C, product olivine and sulfide compositions in the ranges 96 to 97 mol% Fo and 15 to 70 mol% NiS, respectively, and run durations of 28 days. Electron microprobe analysis of product olivine was made on ∼50 μm. Nickel sulfides consist of NiS2, which has a pyrite structure, and Ni3S4, which has a spinel structure. 3 of 7 21/11/ PM All the nickel dihalides are known to exist.

The behavior of nickel in the Earth’s mantle is controlled by sulfide melt–olivine reaction. Prior to this study, experiments were carried out at low pressures with narrow range of Ni/Fe in sulfide melt. As the mantle becomes more reduced with depth, experiments at comparable conditions provide an assessment of the effect of pressure at low-oxygen fugacity conditions. The decomposition temperature decreased as the iron:nickel ratio deviated from the ideal value of A maximum decomposition temperature of degrees celsius was found at an iron:nickel ratio of , decreasing to degrees celsius at a ratio of and The variation in Ni tenor between shoots is suggested to be caused by oxidation occurring prior to or during extrusion, resulting in disequilibrium in f (sub o 2) between the sulfide and silicate melts. As equilibrium is reapproached, oxidation of the sulfide proceeds, resulting in a change in the partitioning behavior of Fe, and consequently. Before the discovery of black smokers, temperatures of the ore fluids were estimated from rare fluid inclusion data and sulfur isotope fractionation between sulfide mineral pairs. pH values about 1 unit less than neutral (~5 at °C) were determined from equilibrium with muscovite present in the stringer zones and estimated K.