An experimental study of the solubility of baddeleyite (ZrO2) in fluoride-bearing solutions at elevated temperature

Migdisov, Artas; Williams‐Jones, Anthony E.; Hinsberg, Vincent J. van; Salvi, Stefano

doi:10.1016/j.gca.2011.09.043

Cited by 91 publications

(22 citation statements)

References 36 publications

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“…These early fluids had high salinity and also likely had high pH 847 (suggested by the precipitation of nahcolite in the Group 3 inclusions). We therefore propose that 848 the REE were transported initially as hydroxy or hydroxy-fluoride complexes; hydroxy-fluoride 849 complexes have been shown to be important in the transport of Zr and Nb (Migdisov et al, 2011;850 Timofeev et al, 2015). 851…”

Section: Higher Hydrocarbons 804mentioning

confidence: 95%

Fluid evolution in the Strange Lake granitic pluton, Canada: Implications for HFSE mobilisation

2016

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10Strange Lake is a mid-Proterozoic peralkaline granite pluton (Québec-Labrador, Canada) that 11 underwent extreme enrichment in high field strength elements (HFSE), including the rare earth 12 elements (REE). The HFSE mineralisation is confined to highly altered pegmatites and the most 13 altered parts of the granites, implying a genetic association between hydrothermal fluids and 14 HFSE enrichment. This study uses analyses of fluid inclusions to investigate the hydrothermal 15 evolution of the Strange Lake pluton and the role of hydrothermal processes in concentrating the 16 HFSE to potentially exploitable levels. 17Five groups of inclusions were distinguished. From earliest to latest, these groups are: primary 18 aqueous inclusions (~25 wt.% NaCl eq.) associated with melt inclusions (Group 1); primary 19 Fluid evolution commenced with the exsolution of a saline aqueous liquid (~25 wt.% NaCl eq.) 28 and an immiscible CH 4 +H 2 gas from the pegmatitic melt at temperatures of ~450-500 °C and a 29 pressure of ~1100 bars. During isobaric cooling, the gas component of the fluid was gradually 30 oxidised, evolving from being CH 4 -dominant to a CH 4 fluid with a significant proportion of 31 higher order hydrocarbons (due to oxidative coupling of methane induced by the consumption of 32 O 2 through the alteration of arfvedsonite to aegirine; ~325-360°C), and finally to a CO 2 -33 dominated fluid at ~300 o C. The apparent salinity of the aqueous fluid decreased from ~25 to 34 ~4.5 wt.% NaCl eq. due to fluid-rock interaction. The latter also caused precipitation of nahcolite 35 (as a result of the reaction of newly formed CO 2 with sodium from decomposing minerals), 36 formation of pseudomorphs after primary Na-zirconosilicates and Na-titanosilicates and 37 replacement of primary REE-silicates by bastnäsite-(Ce). Owing to this interaction, the carbonic 38 component of the fluid was consumed which, together with the consumption of H 2 O to form Al-, 39 K-and Fe-phyllosilicates, contributed to an increase in the fluid salinity (up to ~19 wt.% NaCl 40 eq.). 41 3 Light rare earth elements (LREE) were remobilised over 10s to 100s of metres by the high 42 temperature high salinity fluid (preserved as Group 1 and 2a inclusions), whereas heavy rare 43 earth elements (HREE) were remobilised on a much smaller scale by a late, low temperature 44 high salinity fluid (trapped as inclusion Group 5). Fluid preserved as inclusion Group 3 may have 45 been responsible for remobilisation of Zr and Ti. 46

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Section: Higher Hydrocarbons 804mentioning

confidence: 95%

Fluid evolution in the Strange Lake granitic pluton, Canada: Implications for HFSE mobilisation

2016

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“…This was not the case. 2) Similar experiments performed in perchlorate-based solutions at the same temperatures to investigate the speciation of rare-earth elements and zirconium were not affected by the decomposition of perchlorate (Migdisov and Williams-Jones, 2007;Migdisov and Williams-Jones, 2009;Migdisov et al, 2011).…”

Section: Introductionmentioning

confidence: 97%

An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

Timofeev

Migdisov

Williams‐Jones

2015

Geochimica et Cosmochimica Acta

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147

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Please cite this article as: Timofeev, A., Migdisov, Art.A., Williams-Jones, A.E., An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature, Geochimica et Cosmochimica Acta (2015), doi: http://dx. AbstractThe solubility of Nb 2 O 5 and the speciation of niobium in HF-bearing aqueous solutions have been determined at temperatures of 150, 200, and 250 °C and saturated water pressure. At a pH of ~2 and at low HF concentration, niobium is transported primarily as the species Nb(OH) 4 + and at high HF concentration, as the species NbF 2 (OH) 3°. Equilibrium constants for the formation of Nb(OH) 4 + range from -11.23 ± 0.26 to -10.86 ± 0.24 and for the formation of NbF 2 (OH) 3° from -3.84 ± 0.20 to -5.08 ± 0.42, at 150 and 250 °C.The results of this study show that the solubility of Nb 2 O 5 (solid) in aqueous fluids increases with increasing HF concentration, but is not strongly affected by temperature. The influence of pH is variable;at low pH and HF concentration, a decrease in pH increases the solubility of Nb 2 O 5 (solid). At higher pH the reverse may be true. Modeling of the transport and deposition of niobium suggests that simple mixing with a brine is not an effective method for removing niobium from solution. By contrast, interaction of an acidic fluid with carbonate rock results in a rapid reduction of capacity of the fluid to mobilize niobium.

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“…This was not the case. 2) Similar experiments performed in 145 perchlorate-based solutions at the same temperatures to investigate the speciation of rare-earth 146 elements and zirconium were not affected by the decomposition of perchlorate Jones, 2007; Migdisov et al, 2009Migdisov et al, , 2011. 148 149…”

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confidence: 98%

An experimental study of the solubility and speciation of tantalum in fluoride-bearing aqueous solutions at elevated temperature

Timofeev

Migdisov

Williams‐Jones

2017

Geochimica et Cosmochimica Acta

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118

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An experimental study of the solubility of baddeleyite (ZrO2) in fluoride-bearing solutions at elevated temperature

Cited by 91 publications

References 36 publications

Fluid evolution in the Strange Lake granitic pluton, Canada: Implications for HFSE mobilisation

Fluid evolution in the Strange Lake granitic pluton, Canada: Implications for HFSE mobilisation

An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

An experimental study of the solubility and speciation of tantalum in fluoride-bearing aqueous solutions at elevated temperature

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