Dualistic distribution coefficients of trace elements in the system mineral–hydrothermal solution. III. precious metals (Au and Pd) in magnetite and manganmagnetite

Таусон, В. Л.; Babkin, D. N.; Pastushkova, T. M.; Smagunov, N. V.; Lipko, S. V.; Voronova, I. Yu.; Men’shikov, V. I.; Bryanskii, N. V.; Arsent’ev, K. Yu.

doi:10.1134/s0016702916020063

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Therefore, the presence of two Ce forms is not an artifact; the effect of surface enrichment in REE is not caused by the formation of diffusion zone or normal adsorption, and Ce valence state is not as rigidly associated with f O 2 as is commonly believed, because the ratio of Ce 3+ /Ce 4+ is approximately the same for magnetite and hematite. The composition of Mt surface is consistent with the XPS data [24]. The ratio of Fe 3+ /Fe 2+ is approximately 1.1 (Table 8), in the O 1s spectrum there are identified O 2− and OH − in the ratio 60:40 for magnetite and 80:20 for hematite.…”

Section: Distribution Of Reesupporting

confidence: 85%

“…The methods of D determination in two series of experiments are described below. The distribution of precious metals (PM) was previously discussed [21,[23][24][25] and is only supplemented here with fresh data. The distribution of rare earth elements (REE) in the systems magnetite (hematite) fluid has not been previously considered.…”

Section: Methodsmentioning

confidence: 99%

“…Hence, it is clear that the total distribution coefficient will be imposed mainly by surface mode. Table 2 summarizes previously acquired data [21,[23][24][25] and the data of the current research on partition coefficients of PM (Au, Pt, Pd) in the systems "mineral-hydrothermal solution". Figure 3.…”

Section: Distribution Of Precious Metalsmentioning

confidence: 99%

“…Adding Mn to the system and causing crystallization of solid solutions (Fe, Mn) [Fe 2 O 4 ], it is possible to prevent the formation of NAP, resulting in flattening the curves C PM − S SP [21,24]. This is accounted for by the enrichment of the surface with manganese confirmed by layer-by-layer analysis based on LA-ICP-MS method [24]. That is, on the surface there is too little iron to form Fe oxyhydroxide (similar to hydromagnetite) surficial phase.…”

Section: Distribution Of Precious Metalsmentioning

confidence: 99%

“…The emergence of NAP has a number of important implications, two of which are dealt with in this work: dualism of TE distribution coefficient and formation of hidden forms of metal content; the so-called invisible modes of metal occurrence. When considering these interrelated phenomena, we will refer to the results of earlier pilot studies [21,[23][24][25], as well as to the data of studies of natural ore minerals with admixtures of precious metals.…”

Section: Introductionmentioning

confidence: 99%

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Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

et al. 2018

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Trace element (TE) partitioning in the system "mineral-hydrothermal solution" is studied by the method of thermo-gradient crystal growth coupled with internal sampling of a fluid phase. The analytical procedure used enables evaluating of structurally bound and superficially bound modes of TE in crystals and determining corresponding dual partition coefficients. The case of precious metals (PM-Au, Pt, Pd) at 450 and 500 • C and 100 MPa pressure is considered. The minerals are pyrite, As-pyrite, magnetite, Mn-magnetite and hematite and fluids are ammonium chloride-based hydrothermal solutions. The partition coefficients for structural and surficial modes, D str p and D sur p , are found to be unexpectedly high (except for Au in pyrite). High concentrations of PM are attributed to superficial nonautonomous phases (NAPs), which can be considered as primary concentrators of PM. We also have studied the co-crystallization (exchange) coefficients (D e) of REE (Ce, Eu, Er, Yb) and Fe in magnetite and hematite at 450 • C and 100 MPa. D sur e is elevated to two orders of magnitude as compared to D str e. It is shown that not only physicochemical parameters affect REE distribution in hydrothermal systems, but also NAP presence and its composition. The crystal growth mechanism specified by the agency of NAP is suggested. The study of PM distribution in natural pyrite of gold-ore deposits supported the importance of differentiating between structurally and superficially bound TE modes for correct use of experimental D values to determining element concentrations in ore-forming fluids.

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Section: Distribution Of Reesupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Distribution Of Precious Metalsmentioning

confidence: 99%

Section: Distribution Of Precious Metalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

et al. 2018

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Distribution and segregation of trace elements during the growth of ore mineral crystals in hydrothermal systems: geochemical and mineralogical implications

Таусон

Lipko

Smagunov

et al. 2018

Russian Geology and Geophysics

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The interfacial crystal layer of poorly soluble mineral grown under hydrothermal conditions is modified chemically into a surficial nonautonomous phase (SNAP) and, in this capacity, takes part in growth process, doing several important functions. This paper considers some of them related to geochemistry and mineralogy. The new interpretation is given to the following phenomena: (1) selection of components during crystal growth in multiphase associations; (2) stability of multiphase parageneses having a common chemical component; (3) dual character of the distribution coefficients due to different properties of the crystal volume and SNAP; (4) formation of nano- and microinclusions of unusual composition different from the basic mineral phase; (5) spatial ordering of nano- and microparticles during their directed aggregation at the growing crystal face; (6) accumulation of valuable components (primarily noble metals), incompatible in most of mineral matrixes, in the surficial layer; and (7) effect of “hidden” metal content, associated with the presence of noble metals in the SNAP or of nano- and microinclusions formed during the SNAP evolution.

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Distribution of siderophile and chalcophile elements in serpentinites of the oceanic lithosphere as an insight into the magmatic and crustal evolution of mantle peridotites

2016

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Dualistic distribution coefficients of trace elements in the system mineral–hydrothermal solution. III. precious metals (Au and Pd) in magnetite and manganmagnetite

Cited by 7 publications

References 26 publications

Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

Trace Element Partitioning Dualism under Mineral–Fluid Interaction: Origin and Geochemical Significance

Distribution and segregation of trace elements during the growth of ore mineral crystals in hydrothermal systems: geochemical and mineralogical implications

Distribution of siderophile and chalcophile elements in serpentinites of the oceanic lithosphere as an insight into the magmatic and crustal evolution of mantle peridotites

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