Experimental studies of Ta2O5 and columbite–tantalite solubility in fluoride solutions from 300 to 550°C and 50 to 100 MPa

Zaraisky, G. P.; Korzhinskaya, V. S.; Kotova, N. P.

doi:10.1007/s00710-010-0112-z

Cited by 139 publications

(53 citation statements)

References 12 publications

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“…6). If we extrapolate the results of this study to 400 °C, the curve of best fit for 259 this temperature lies just above and parallel to the data of Zaraisky et al (2010). This constitutes a 260 remarkably high level of agreement, particularly considering that our study and that of Zaraisky et al ).…”

Section: Identification Of Dissolved Tantalum Species 151supporting

confidence: 61%

“…Thus, it is 314 plausible that at higher HF activity than considered by , the dependence of 315 niobium solubility on HF activity increases from a logarithmic slope of 2 to a slope of 3. Such an increase 316 is suggested by the observation that concentrations of niobium and tantalum in equilibrium with 317 columbite-(Mn) at 400 °C have similar dependencies on HF activity (Zaraisky et al, 2010). If the 318 logarithm of the slope of Nb solubility over HF activity were to approach that for tantalum at high HF 319 activity, transport of niobium would predominate relative to that of tantalum under almost any fluoride 320 activity at acidic conditions.…”

Section: Identification Of Dissolved Tantalum Species 151mentioning

confidence: 97%

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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

117

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Section: Identification Of Dissolved Tantalum Species 151supporting

confidence: 61%

Section: Identification Of Dissolved Tantalum Species 151mentioning

confidence: 97%

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

117

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“…Secondly, the crystallization of massive topazite and the partial dissolution of the quartz veins in the La Bosse stockwork imply that the magmatic fluid was F-and Al-rich and undersaturated relatively to SiO 2 and has slightly interacted with the enclosing rocks. Finally, the relatively high contents of Nb and Ta in the L1 fluid are also consistent with a high concentration of F, which has been shown to increase significantly the solubility of Nb and Ta in hydrothermal solutions [79,80]. This resulted in the precipitation of Nb (and Ta) as columbite-tantalite and wolframoixiolite in microvugs during the topazification of the quartz-ferberite stockwork [42].…”

Section: Magmatic Signature Of the Early Primary Fluids From Thementioning

confidence: 75%

Geochemical Signature of Magmatic-Hydrothermal Fluids Exsolved from the Beauvoir Rare-Metal Granite (Massif Central, France): Insights from LA-ICPMS Analysis of Primary Fluid Inclusions

et al. 2017

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The Beauvoir granite (Massif Central, France) represents an exceptional case in the European Variscan belt of a peraluminous raremetal granite crosscutting an early W stockwork. The latter was strongly overprinted by rare-metal magmatic-hydrothermal fluids derived from the Beauvoir granite, resulting in a massive topazification of the quartz-ferberite vein system. This work presents a complete study of primary fluid inclusions hosted in quartz and topaz from the Beauvoir granite and the metasomatized stockwork, in order to characterize the geochemical composition of the magmatic fluids exsolved during the crystallization of this evolved rare-metal peraluminous granite. Microthermometric and Raman spectrometry data show that the earliest fluid (L1) is of high temperature (500 to >600 ∘ C), high salinity (17-28 wt.% NaCl eq), and Li-rich ( e < −70 ∘ C) with Na/Li ratios ∼5. LA-ICPMS analyses of L1-type fluid inclusions reveal that the chemical composition of this magmatic-hydrothermal fluid is dominated by Na, K, Cs, and Rb, with significant concentrations (10 1 -10 4 ppm) in rare-metals (W, Nb, Ta, Sn, and Li). This study demonstrates that primary fluid inclusions preserved the pristine signature of the magmatic-hydrothermal fluids in the Beauvoir granite but also in the metasomatized W stockwork, despite the distance from the granitic cupola (>100 m) and interaction with external fluids.

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“…Transport of large quantities of Nb (and Ta) can only occur in concentrated F-rich solutions (Keppler 1993;Linnen and Keppler 1997;Linnen 1998;Zaraisky et al 2010). Aqueous fluoride-rich fluids are, therefore, unable to remove Nb and Ta from the melt, but they may dissolve previously crystallized columbitetantalite and thereby allow for mobilization and redeposition of these elements ).…”

Section: Experimental Constraintsmentioning

confidence: 99%

“…Many workers have examined these phases in terms of their crystal chemistry and zonation (e.g., Tindle and Breaks 2000;Novák et al 2003;Chudík et al 2011), relationship with other Nb-Ta minerals (e.g., Černý et al 1986;Van Lichtervelde et al 2007), and mineral structures (e.g., Ercit et al 1995). Recently, experimental studies have investigated the solubility of columbite-tantalite in granitic melts and aqueous fluids (Linnen and Keppler 1997;Linnen 1998;Chevychelov et al 1998Chevychelov et al , 2004Chevychelov et al , 2005Chevychelov et al , 2010Zaraisky et al 2010).…”

Section: Introductionmentioning

confidence: 99%

A geological, geochemical and textural study of an LCT pegmatite: implications for the magmatic versus metasomatic origin of Nb-Ta mineralization in the Moose II pegmatite, Northwest Territories, Canada

Anderson¹,

Lentz²,

McFarlane³

et al. 2013

Jour. Geosci.

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The internal zonation and chemical evolution of Nb-Ta oxides and muscovite have been characterized in the Moose II pegmatite, Northwest Territories, Canada, to distinguish primary magmatic mineralization from that formed during late--stage metasomatic processes. In addition, muscovite associated with Nb-Ta oxides was examined in order to assess the evolution of the pegmatite melt and the nature of the late-stage fluids. Detailed mapping shows that the studied body (430 × 61 m) is a highly fractionated, irregularly zoned, spodumene--subtype rare-element pegmatite dominated by coarse-grained to megacrystic albite, K-feldspar, and spodumene, with intergranular assemblages of quartz, K-feldspar, albite, spodumene, muscovite, and minor amblygonite-montebrasite. Monomineralic core zones (quartz and amblygonite-montebrasite), aplitic albite 'pods,' and units characterized by phyllic alteration occur in the central portions of the pegmatite. Columbite-tantalite minerals occur throughout the pegmatite, excluding the quartz cores, and patterns of internal zoning include: (1) normally zoned ferrocolumbite with early Ta-Ti-rich, and later Nb-W-rich overgrowths; (2) oscillatory zoned Ti-rich ferrotantalite with Nb-rich patchy replacement; (3) reversely zoned ferrocolumbite, with Ta-rich cores and (4) complexly zoned Ti-rich ferrotantalite with abundant late Nb-and Ta-rich patches and sieve textures. The textures and chemical patterns demonstrate an evolution from columbite to tantalite, whereby the Ta/(Ta + Nb) ratio increased with progressive fractionation (0.13-0.59) but the Mn/(Mn + Fe) ratio remained nearly constant (0.15-0.31). The chemical evolution of the Nb-Ta oxides from columbite to tantalite is consistent with crystallization from a magmatic to late-stage magmatic Na-rich melt, with a sequence of crystallization progressing from those of the wall zone, to the first intermediate zone, and finally the late aplitic albite zones. Minor remobilization of Nb, and to a lesser extent Ta, was responsible for some of the replacement features found in the Nb-Ta oxides. Textural observations and trace-element analyses of fine-grained, secondary muscovite found throughout the pegmatite indicate hydrothermal metasomatism by a late F-and Nb-rich vapor-like "supercritical" fluid.

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Experimental studies of Ta2O5 and columbite–tantalite solubility in fluoride solutions from 300 to 550°C and 50 to 100 MPa

Cited by 139 publications

References 12 publications

An experimental study of the solubility and speciation of tantalum 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

Geochemical Signature of Magmatic-Hydrothermal Fluids Exsolved from the Beauvoir Rare-Metal Granite (Massif Central, France): Insights from LA-ICPMS Analysis of Primary Fluid Inclusions

A geological, geochemical and textural study of an LCT pegmatite: implications for the magmatic versus metasomatic origin of Nb-Ta mineralization in the Moose II pegmatite, Northwest Territories, Canada

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