Solubility of magnetite in supercritical chloride solutions

Chou, I-Ming; Eügster, Hans P.

doi:10.2475/ajs.277.10.1296

Cited by 163 publications

(80 citation statements)

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“…Accordingly, information on aqueous speciation of metal chlorides in NaCl-bearing hydrothermal solutions is indispensable for a thorough under standing of the hydrothermal ore-forming process. Previously, many experiments on aqueous specia tion of metal chlorides were conducted using Ag AgCl buffer technique in NaCl-free systems under supercritical conditions (e.g., Chou and Eugster, 1977;Frantz and Popp, 1979;Frantz, 1979, 1980;Boctor et al, 1980;Boctor, 1985;Lin and Popp, 1984). On the other hand, little is known about aqueous speciation of metal chlorides in supercritical NaCl-bearing hydrothermal solutions.…”

Section: Introductionmentioning

confidence: 99%

Aqueous speciation of magnesium, strontium, nickel and cobalt chlorides in hydrothermal solutions at 600.DEG.C. and 1 kbar.

1996

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The effect of NaC1 on ion exchange equilibria in the system CaWO4-McWO4-CaCl2-McCl2-H20 (Me: Mg, Sr, Ni and Co) was experimentally monitored at 600°C and 1 kbar . The Ca/(Ca + Me) ratio of the aqueous chloride solution in equilibrium with both CaWO4 and McWO4 was constant for Mg and Sr in spite of the addition of NaCl, whereas the ratio decreased significantly for Ni and Co with the increase of NaCl. The experimental results indicate that both Ni2+ and Co2+ do form higher-order chloro-complexes such as NiCl3-aq and COC13-aq, whereas both Mg2+ and Sr2+ may not . The thermodynamic analysis of the experimental results gives 1.5 and 2.1 in logarithm units for the formation constants for NiCl3-aq and CoCl3-aq, respectively. By combining the results of Uchida et al. (1995), MeCl2aq tends to forms McCl3-aq in the order of SrC12aq CaCl2aq = MgCl2aq << NiCl2aq < FeCl2aq < COC12aq < MnCl2aq at 600°C and 1 kbar. Based on ligand field theory, the above order may suggest that the transition metal cations exist as tetrahedral chloro-complexes with low-spin state in the supercritical hydrothermal solutions .

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Section: Introductionmentioning

confidence: 99%

Aqueous speciation of magnesium, strontium, nickel and cobalt chlorides in hydrothermal solutions at 600.DEG.C. and 1 kbar.

1996

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“…In contrast to the systematic changes in δ 18 O values with increasing formation temperature for hematite and magnetite, δ 56 Fe values should remain relatively unchanged due to the low solubility of iron in aqueous solutions at hydrothermal temperatures (Chou and Eugster, 1977;Simon et al, 2004), slow diffusion of Fe in hematite and magnetite (Hallstrom et al, 2011), and (Klein, 2005). Siderite typically occurs as minute, single rhomb-shaped crystals or massive layers of microcrystalline aggregates (James, 1951;Trendall and Blockley, 1970;Ayers, 1972).…”

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confidence: 99%

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

379

257

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“…This in part reflects the strong control of chlorinity on Fe solubility in most relatively reducing environments (Chou and Eugster, 1977;Kwak et al, 1986;Yardley, 2005). Iron was effectively mobilised from a volumetrically extensive zone during the regional albitisation and scapolitisation events that affected the Fennoscandian shield in northern Sweden and western Finland (Freitsch, 1997;Niiranen, 2005).…”

Section: Controls On Major Element Chemistrymentioning

confidence: 99%

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

Smith

Gleeson

Yardley

2013

Geochimica et Cosmochimica Acta

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Please cite this article as: Smith, M.P., Gleeson, S.A., Yardley, B.W.D., Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous-carbonic brines, Geochimica et Cosmochimica Acta (2012), doi: http://dx.doi.org/10. 1016/j.gca.2012.10.015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous-carbonic brines. Iron and other transition metal contents correlate strongly with Cl concentrations, with secondary controls on solubility from pH, redox and temperature. Copper and Ag contents are higher in lower salinity aqueous-carbonic brines (up to 5000ppm Cu, 900ppm Ag) than in the most saline brines (up to 2297ppm Cu, 837ppm Ag). This may reflect differences in metal source between deposit types, but is also consistent with the complexation of Cu by bisulphide in the lower salinity fluids. Late stage aqueous-carbonic fluid flux through the deformed deposits either introduced additional copper to the deposits, remobilised pre-existing copper or both.

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Solubility of magnetite in supercritical chloride solutions

Cited by 163 publications

References 0 publications

Aqueous speciation of magnesium, strontium, nickel and cobalt chlorides in hydrothermal solutions at 600.DEG.C. and 1 kbar.

Aqueous speciation of magnesium, strontium, nickel and cobalt chlorides in hydrothermal solutions at 600.DEG.C. and 1 kbar.

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

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