Email this article Dualistic distribution coefficients of trace elements in the system mineral–hydrothermal solution. III. precious metals (Au and Pd) in magnetite and manganmagnetite
- Authors: Tauson V.L.1, Babkin D.N.1, Pastushkova T.M.1, Smagunov N.V.1, Lipko S.V.1, Voronova I.Y.1, Men’shikov V.I.1, Bryanskii N.V.1, Arsent’ev K.Y.2
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Affiliations:
- Vinogradov Institute of Geochemistry, Siberian Branch
- Institute of Limnology, Siberian Branch
- Issue: Vol 54, No 2 (2016)
- Pages: 149-166
- Section: Article
- URL: https://journals.rcsi.science/0016-7029/article/view/155113
- DOI: https://doi.org/10.1134/S0016702916020063
- ID: 155113
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Abstract
Distribution coefficients D of Au and Pd between magnetite (manganmagnetite) and ammonium chloride hydrothermal solution and the structural Dstr and surface-related Dsur terms of these coefficients were determined at 450 and 500°С and a pressure of 1 kbar using internal sampling techniques. Quantitative data on the speciation of precious metals are obtained using the technique of statistical selections of analytical data on single crystals SSADSC and compared with LA-ICP-MS data. Both Pd and Au are elements compatible with magnetite and its manganoan variety: Dstr is ≈3 for Pd and ≈1 for Au, although Au seems to weakly enrich fluid at 500°C: Dstr ≈ 0.5–0.8. The trends of postmagmatic Pd and Au fractionation can thus strongly depend on the presence of spinel-group minerals, first of all, magnetite and its solid solutions. The dualistic nature of the distribution coefficients provides sound grounds to believe that both elements are highly compatible, with regard not only for the structural but also for the surface-related modes of their occurrence (Dsur ≈ 17 and ≈50–70 for Au and Pd, respectively). The maximum concentrations of structural modes of the elements are 5.3 ppm for Au and 5.1 ppm for Pd and were found in the solid solution whose jacobsite mole fractions were 0.82 and 0.49, respectively. The principal distribution patterns of the elements in crystals are confirmed by LA-ICP-MS data. Data on this system testify that the distribution coefficients of minor and trace elements are geochemically dualistic because of the abnormal absorption properties of nanometer-sized nonautonomous phases on the surface of ore minerals, and this dualism plays an important geochemical role.
About the authors
V. L. Tauson
Vinogradov Institute of Geochemistry, Siberian Branch
Author for correspondence.
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
D. N. Babkin
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
T. M. Pastushkova
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
N. V. Smagunov
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
S. V. Lipko
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
I. Yu. Voronova
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
V. I. Men’shikov
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
N. V. Bryanskii
Vinogradov Institute of Geochemistry, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Favorskogo 1a, Irkutsk, 664033
K. Yu. Arsent’ev
Institute of Limnology, Siberian Branch
Email: vltauson@igc.irk.ru
Russian Federation, ul. Ulan-Batorskaya 3, Irkutsk, 664033
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