Geochemistry and formation conditions of rare-metal granites with various fluorine-bearing minerals (fluorite, topaz, and cryolite)

Антипин, В. С.; Savina, Elena; Mitichkin, M. A.

doi:10.1134/s0016702906100028

Cited by 13 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These rocks 47 typically occur in extensional, intraplate/post-collisional settings (Burt et al, 1982;48 Kovalenko et al, 2007;Taylor, 1992). Ongonites and other strongly fractionated, 49 topaz-bearing rocks are known to be enriched in Li, B, Sn, Zn, W, Mo and U, other 50 than Nb-Ta, to concentrations that can amount to ore deposits (Antipin et al, 2006;51 Burt et al, 1982;Christiansen and Lee, 1986;Haapala, 1997;Syritso et al, 2012;52 Taylor, 1992; Moghazi et al, 2011). Niobium-Ta oxides, such as the columbite-53 tantalite solid solution series and ixiolite, deposited as magmatic accessory phases and 54 in alteration zones around F-rich intrusions, account for most of the current 55 production of these elements worldwide (Melcher et al, 2014).…”

Section: Introduction 16mentioning

confidence: 99%

Crystallisation of magmatic topaz and implications for Nb–Ta–W mineralisation in F-rich silicic melts — The Ary-Bulak ongonite massif

Agangi

Kamenetsky

Hofmann

et al. 2014

Lithos

View full text Add to dashboard Cite

Textural, mineralogical and geochemical data on F-rich rhyolite (ongonite) from the Ary-Bulak massif of eastern Transbaikalia help constraining the formation of magmatic topaz. In these rocks, topaz occurs as phenocrysts, thus providing compelling evidence for crystallisation at the orthomagmatic stage. Cathodoluminescence images of topaz and quartz reveal growth textures with multiple truncation events in single grains, indicative of a dynamic system that shifted from saturated to undersaturated conditions with respect to topaz and quartz. Electron microprobe and Raman analyses of topaz indicate near-pure F composition [Al2SiO4F2], with very limited OH replacement. Laser ablation ICP-MS traverses revealed the presence of a large number of trace elements present at sub-ppm to hundreds ppm levels. The chemical zoning of topaz records trace element fluctuations in the coexisting melt. Concentrations of some trace elements (Li, Ga, Nb, Ta and W) are correlated with cathodoluminescence intensity, thus suggesting that some of these elements act as CL activators in topaz. The study of melt inclusions indicates that melts with different F contents were trapped at different stages during formation of quartz and topaz phenocrysts, respectively. Electron microprobe analyses of glass in subhedral quartz-hosted melt inclusions indicate F ≤1.2 wt.%, whereas irregular-shaped melt inclusions hosted in both topaz and quartz have F ≤9 wt.%. Cryolithionite [Na3Li3Al2F12] coexists with glass in irregular inclusions, implying high Li contents in the melt. The very high F contents would have increased the solubility of Nb, Ta and W in the melt, thus allowing progressive concentration of these elements during magma evolution. Crystallisation of Nb-Ta-W-oxides (W-ixiolite and tantalite-columbite) may have been triggered by separation of cryolithionite, which would have caused F and Li depletion and consequent drop in the solubility of these elements.

show abstract

Section: Introduction 16mentioning

confidence: 99%

Crystallisation of magmatic topaz and implications for Nb–Ta–W mineralisation in F-rich silicic melts — The Ary-Bulak ongonite massif

Agangi

Kamenetsky

Hofmann

et al. 2014

Lithos

View full text Add to dashboard Cite

show abstract

“…2 2012 plate peralkaline aegerine-annite leucogranites of within plate igneous complexes. In contrast to the peraluminous rocks of fold region, they contain less Rb; are enriched in REE, Pb, Sr, Ba; and character ized by elevated K/Rb and Ba/Rb ratios: > 100 and > 1, respectively (Tauson, 1971;Pearce et al, 1984;Whalen et al, 1987;Yarmolyuk and Kovalenko, 1991;Goodenough et al, 2000;Antipin et al, 2006). The lower Nb and Li contents (20 and 42-48 ppm, respec tively) and deep Eu minima of leucogranites from the Dukat ore field are regarded as their special geochem ical attributes.…”

Section: Mineral and Chemical Composition Of Late Cretaceous Granitesmentioning

confidence: 97%

“…All inclusions are characterized by inequigranular internal structure and do not reveal gravitational dif (1, 2) A type leucogranite: (1) Dukat ore field; see Table 2 for numbers; 6K and 7K are data from Zakharov et al (2002); (2) Lachlan Fold Region (Whalen et al, 1987), African grabens in the fields of medium Al rocks (Pearce et al, 1984); within plate Pitinga (Antipin et al, 2006) and Ivigtut (Goodenough et al, 2000) ring complexes in the field of Al undersaturated rocks; (3-5) high Al granites of fold zones:…”

Section: Types Of Melanocratic Inclusions In Granitic Rocks and Theirmentioning

confidence: 98%

“…It is suggested that in the intrusions of foldbelts the dispersed minerals are consecutively deposited in the course of magma crystallization, whereas in anoro genic granitoids they concentrate in schlieren (Tau son, 1977;Whalen et al, 1987;Foster, 1998aFoster, , 1998bAntipin et al, 2006). The dispersed mineralization in granitic rocks is also related to the postmagmatic activity giving rise to the formation of diverse rare metal, nonferrous, noble, ferrous metals, and fluorite deposits in the Variscan metallogenic provinces of western and central Europe, eastern Transbaikal region, Beltau-Kurama ore belt, etc.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Dispersed mineralization in granitic rocks in the Dukat ore field, the Russian Northeast: Sources and relationship with epithermal gold-silver and silver-base-metal ores

2012

View full text Add to dashboard Cite

The dispersed mineralization in the Late Cretaceous leucogranite of the Dukat ore field comprises melanocratic high sulfide epidote-feldspar, pyroxene-feldspar and low sulfide allanite-fluorite-feldspar inclusions in greisenized intrusions. The silver-base metal mineralization is composed of pyrite, pyrrhotite, small particles of Pb, Zn, Sn, Ag, and Sb sulfides and oxides, their native species, and intermetallic com pounds; the rare metal mineralization consists of REE, Th, U, Ti, Zr, Nb, Ta, and W oxides, silicates, and aluminosilicates. The isotopic Nd, Sr, and Pb isotopic compositions and geochemical characteristics of the mineralized inclusions, rock forming minerals of granitoids, hydrothermal minerals of preore metasomatic propylites and orebodies at the Dukat deposit show that their components have been taken from heteroge neous domains of the Paleozoic juvenile continental crust of the Siberian Platform.

show abstract

“…The scientific literature reports that cryolite ores usually contain also quartz, feldspar, fluorite and various aluminofluorides. 1,29,30 Chiolite [Na 5 Al 3 The presence of quartz as a definite crystalline phase in the diffractogram of the insoluble residue strongly suggests that silicon present in the sample was not fully converted into SiF 4 by HF generated during cryolite reaction with sulfuric acid (reaction 3). This means that the generation and removal of HF from the vessel was faster than its reaction kinetics with SiO 2 (reaction 3).…”

Section: Optimization Of Leaching Conditionsmentioning

confidence: 99%

Evaluation of Cryolite From Pitinga (Amazonas-Brazil) as a Source of Hydrogen Fluoride

Paulino¹,

Neumann²,

Afonso³

2016

Química Nova

View full text Add to dashboard Cite

This paper reports the use of cryolite from the Pitinga Mine (Amazonas state, Brazil) as raw material in hydrogen fluoride production. Samples were initially characterized by chemical and mineralogical analyses. They presented low silica content (< 4 wt.%). After milling, cryolite samples were digested with concentrated sulfuric acid under stirring (200 rpm) and variable temperature, time and liquid to solid ratio conditions. Under the best experimental conditions (140 °C, 3-5 h), 96 wt.% of fluorine was recovered as hydrogen fluoride. The application of a 2 3 full factorial design showed that temperature and reaction time were relevant parameters during leaching, whereas liquid to solid ratio was not statistically significant.

show abstract

Geochemistry and formation conditions of rare-metal granites with various fluorine-bearing minerals (fluorite, topaz, and cryolite)

Cited by 13 publications

References 10 publications

Crystallisation of magmatic topaz and implications for Nb–Ta–W mineralisation in F-rich silicic melts — The Ary-Bulak ongonite massif

Crystallisation of magmatic topaz and implications for Nb–Ta–W mineralisation in F-rich silicic melts — The Ary-Bulak ongonite massif

Dispersed mineralization in granitic rocks in the Dukat ore field, the Russian Northeast: Sources and relationship with epithermal gold-silver and silver-base-metal ores

Evaluation of Cryolite From Pitinga (Amazonas-Brazil) as a Source of Hydrogen Fluoride

Contact Info

Product

Resources

About