The Beauvoir topaz-lepidolite albite granite (Massif Central, France); the disseminated magmatic Sn-Li-Ta-Nb-Be mineralization

Cuney, Michel; Marignac, Christian; Weisbrod, Alain

doi:10.2113/gsecongeo.87.7.1766

Cited by 209 publications

(50 citation statements)

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“…The Yichun granite (China) is one of the closest geologically, also composed of several units including biotite granite and a most evolved Li-mica granite with a similar accessory assemblage including, topaz, monazite, zircon with columbite group minerals, microlite, rutile and cassiterite as the main Nb, Ta, Sn-bearing minerals (Belkasmi et al, 2000;Yin et al, 1995). The Beauvoir granite (Massif Central, France) is also very similar to the St. Austell granite and display a Sn-Li-TaNb-Be disseminated mineralisation and accessory minerals such as topaz, apatite, amblygonite, columbite-tantalite, microlite, zircon, uraninite and sphalerite (Cuney et al, 1992;Raimbault et al, 1995). Further similarities exist with the Podlesí granite (Czech Republic), which is composed of three magmatic units, including biotite granite, and two Li-mica granites which all contain disseminated Ta-Nb-Ti-W-Sn minerals including rutile, cassiterite, Fe-columbite, ixiolite and ferberite (Breiter et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Rare earth (La, Ce, Nd) and rare metals (Sn, Nb, W) as by-product of kaolin production, Cornwall: Part1: Selection and characterisation of the valuable stream

Dehaine

Filippov

2015

Minerals Engineering

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Section: Discussionmentioning

confidence: 99%

Rare earth (La, Ce, Nd) and rare metals (Sn, Nb, W) as by-product of kaolin production, Cornwall: Part1: Selection and characterisation of the valuable stream

Dehaine

Filippov

2015

Minerals Engineering

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“…Involvement of a fluid phase is also supported by the presence of albite and fluorite which are typical phases in these type of granites (Harrison and Watson, 1983).The estimated tempeartures are between 800 and À860°C with only a few samples plotting along the 930°C line. (Cunny et al, 1992). Pegmatitic pods, aplite formation and polymetallic mineralization (Nb-Ta, U, Th, Zr, and Mo) observed in the Kanigiri granite also clearly indicate fluid involvement in the late-magmatic stage.…”

Section: Fractionation Indicatorsmentioning

confidence: 91%

Petrology and geochemistry of paleoproterozoic A-type granite at Kanigiri in the Nellore–Khammam schist belt, Andhra Pradesh, India

Rao¹,

Reddy

2007

Journal of Asian Earth Sciences

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“…Traditionally, tantalum has been shown to be relatively immobile in aqueous systems (Cuney et al 1992, Chevychelov et al 2005. However, the presently described network of veinlets provides direct evidence of strong activity of Ta-rich fluid at the late magmatic stage of evolution of the pegmatite.…”

Section: Tantalite Veinlets: Activity Of the Ta-rich Fluid At The Latmentioning

confidence: 99%

COMPLEX INTERNAL TEXTURES IN OXIDE MINERALS FROM THE NANPING No. 31 DYKE OF GRANITIC PEGMATITE, FUJIAN PROVINCE, SOUTHEASTERN CHINA

Rao

Wang

Huan

et al. 2009

The Canadian Mineralogist

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The Nanping No. 31 granitic pegmatite, a highly evolved spodumene-type pegmatite in the Nanping pegmatite district, southeastern China, can be divided into five internal zones from the border inward: zones I-III as the outer zones and zones IV-V as the inner zones. It is strongly mineralized with Nb-Ta-Sn oxide minerals. We investigated these minerals by using back-scattered electron (BSE) imaging and quantitative electron-microprobe analyses (EMPA) to characterize their complex internal textures. The primary Nb-Ta oxide minerals show a sequence from columbite-(Fe) (zone I) through tantalite-(Fe) (zone II) to tantalite-(Mn) (zone III), but distinctly become columbite + wodginite in zone IV and, rarely, columbite in the zone V. Microscopic tapiolite-(Fe) is identified as a product of exsolution in cassiterite from the zones II-III, whereas complex associations of wodginite, columbite-tantalite and tapiolite-(Fe) are characteristic of cassiterite in zone IV. The classic variation of the columbite-group minerals from the zones I to III seems to result from the greater stability of tantalite than columbite components during fractional crystallization of the melt. However, decreasing values of Ta/(Nb + Ta) in columbite-group minerals in the inner zones are more probably compensated by crystallization of abundant primary wodginite-group minerals, controlled by the f(O 2 ) of the magma. Columbite-group minerals commonly exhibit zoning, but complex and multiple-generation phenomena are notable in columbite-tantalite crystals from zones IV-V. In the latter case, later generations of columbite-tantalite overgrow or crosscut the earlier ones. Irregular patterns of zoning are linked to the activity of hydrothermal fluids at the late stages of pegmatite evolution. The high mobility of Ta in such fluids is supported by the development of veinlets of tantalite. They cross-cut first the earlier-formed columbite + wodginite aggregates, and later fill brittle-deformation-induced fissures in the columbite, forming a network texture. The complex internal textures of Nb-Ta-Sn oxide minerals from the zones IV-V indicate a distinctly fluid-rich environment at the late stage of crystallization of the Nanping No. 31 pegmatite.Keywords: Nb-Ta oxide minerals, cassiterite, columbite-tantalite, tapiolite-(Fe), wodginite, Ta-rich fluid, the Nanping No. 31 pegmatite, China.sOmmaiRe La pegmatite granititique dite Nanping No. 31, fortement évoluée et cristallisant le spodumène, affleure dans le district pegmatitique de Nanping, dans le sud-est de la Chine; nous distinguons cinq zones internes allant de la bordure vers le centre: les zones I-III sont externes, et les zones IV-V sont internes. La pegmatite est fortement minéralisée en oxydes de Nb-Ta-Sn. Nous avons étudié ces minéraux et leurs textures internes complexes au moyen d'images générées par les électrons rétrodiffusés et par analyses quantitatives effectuées avec une microsonde électronique. Les oxydes de Nb-Ta primaires définissent une séquence allant de columbite-(Fe) (zone I...

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The Beauvoir topaz-lepidolite albite granite (Massif Central, France); the disseminated magmatic Sn-Li-Ta-Nb-Be mineralization

Cited by 209 publications

References 0 publications

Rare earth (La, Ce, Nd) and rare metals (Sn, Nb, W) as by-product of kaolin production, Cornwall: Part1: Selection and characterisation of the valuable stream

Rare earth (La, Ce, Nd) and rare metals (Sn, Nb, W) as by-product of kaolin production, Cornwall: Part1: Selection and characterisation of the valuable stream

Petrology and geochemistry of paleoproterozoic A-type granite at Kanigiri in the Nellore–Khammam schist belt, Andhra Pradesh, India

COMPLEX INTERNAL TEXTURES IN OXIDE MINERALS FROM THE NANPING No. 31 DYKE OF GRANITIC PEGMATITE, FUJIAN PROVINCE, SOUTHEASTERN CHINA

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