Textural Features and Chemical Evolution in Tantalum Oxides: Magmatic Versus Hydrothermal Origins for Ta Mineralization in the Tanco Lower Pegmatite, Manitoba, Canada

Lichtervelde, Marieke Van; Salvi, Stefano; Béziat, Didier; Linnen, Robert L.

doi:10.2113/gsecongeo.102.2.257

Cited by 154 publications

(63 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is generally accepted that columbite-tantalite minerals primarily form during the emplacement of pegmatites and not through post-pegmatitic hydrothermal processes because of their low hydrothermal solubility (Linnen, 1998;Van Lichtervelde et al, 2007;London, 2008 and references therein). Crystallisation of a single pegmatite body spans only a short time interval (Cerny, 1991;London, 2008).…”

Section: Discussionmentioning

confidence: 99%

Late Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa)

Dewaele

Henjes‐Kunst

Melcher

et al. 2011

Journal of African Earth Sciences

104

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Late Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa)

Dewaele

Henjes‐Kunst

Melcher

et al. 2011

Journal of African Earth Sciences

104

View full text Add to dashboard Cite

“…The textural relationships of the Visole ferrocolumbite indicate its complex origin: a primary magmatic character of the regular oscillatory zones, which are partially replaced by younger, late-magmatic to post-magmatic, secondary irregular zones, presumably originating from dissolution-reprecipitation of the primary ferrocolumbite crystals. Such complicated texture of columbite-group minerals reflects a magmatic to subsolidus evolution of the patental rocks as described in many granitic pegmatites (Van Lichtervelde et al 2007;Rao et al 2009;Chudík et al 2011, etc.). Fluorapatite is the most common phosphate phase in phosphate-poor granitic pegmatites of the LCT family, derived from low-P granitic magmas.…”

Section: Mineral Compositionmentioning

confidence: 92%

Rare-element granitic pegmatite of Miocene age emplaced in UHP rocks from Visole, Pohorje Mountains (Eastern Alps, Slovenia): accessory minerals, monazite and uraninite chemical dating

Uher¹,

Janák²,

Konečný³

et al. 2014

Geologica Carpathica

View full text Add to dashboard Cite

Abstract:The granitic pegmatite dike intruded the Cretaceous UHP rocks at Visole, near Slovenska Bistrica, in the Pohorje Mountains (Slovenia). The rock consists mainly of K-feldspar, albite and quartz, subordinate muscovite and biotite, while the accessory minerals include spessartine-almandine, zircon, ferrocolumbite, fluorapatite, monazite-(Ce), uraninite, and magnetite. Compositions of garnet (Sps [48][49] Alm [45][46] Grs +And 3-4 Prp 1.5-2 ), metamict zircon with 3.5 to 7.8 wt. % HfO 2 [atom. 100Hf/(Hf + Zr) = 3.3-7.7] and ferrocolumbite [atom. Mn/(Mn + Fe) = 0.27-0.43, Ta/(Ta + Nb) = 0.03-0.46] indicate a relatively low to medium degree of magmatic fractionation, characteristic of the muscovite -rare-element class or beryl-columbite subtype of the rare-element class pegmatites. Monazite-(Ce) reveals elevated Th and U contents ( ≤ 11 wt. % ThO 2 , ≤ 5 wt. % UO 2 ). The monazite-garnet geothermometer shows a possible precipitation temperature of ~495 ± 30 °C at P~4 to 5 kbar. Chemical U-Th-Pb dating of the monazite yielded a Miocene age (17.2 ± 1.8 Ma), whereas uraninite gave a younger (~14 Ma) age. These ages are comtemporaneous with the main crystallization and emplacement of the Pohorje pluton and adjacent volcanic rocks (20 to 15 Ma), providing the first documented evidence of Neogene granitic pegmatites in the Eastern Alps. Consequently, the Visole pegmatite belongs to the youngest rare-element granitic pegmatite populations in Europe, together with the Paleogene pegmatite occurrences along the Periadriatic (Insubric) Fault System in the Alps and in the Rhodope Massif, as well as the Late Miocene to Pliocene pegmatites in the Tuscany magmatic province (mainly on the Island of Elba).

show abstract

“…The tantalite plus tapiolite assemblage is typical of all types of rare-element granitic pegmatites of the LCT-family; the association of ferrotapiolite with Ferich columbite-tantalite is mostly characteristic of more primitive beryl type populations (e.g., Černý et al 1986;Černý 1989;Novák et al 2000). The tapiolite + Mn-rich columbite-tantalite pairs occur in the most fractionated beryl and especially complex Li, Cs, Ta, F-rich granitic pegmatites worldwide (e.g., Černý et al 1986, 1992aČerný 1989;Novák et al 2000Novák et al , 2003van Lichtervelde et al 2007). …”

Section: The Tantalite-tapiolite Associationmentioning

confidence: 99%

Accessory columbite to tantalite, tapiolite and zircon: products of extreme fractionation in highly peraluminous pegmatitic granite from the Považský Inovec Mountains, Western Carpathians, Slovakia

Chudík

Uher²,

Kohút³

et al. 2012

J. Geosci.

View full text Add to dashboard Cite

Accessory Fe-rich columbite-group minerals, tapiolite and Hf-rich zircon occur in Hercynian pegmatitic leucogranite near Duchonka, Považský Inovec Mts., western Slovakia. The host rock represents highly peraluminous and fractionated S-type pegmatitic leucogranite with ASI = 1.27, Eu N /Eu* N = 0.16, Rb/Sr = 7.2, Ta/Nb = 1.1 and Zr/Hf = 21, but not enriched in Li, B, Be or P. Columbite-tantalite, tapiolite and hafnian zircon form discrete crystals, 30 to 350 µm in size, in association with quartz, plagioclase, K-feldspar, muscovite, sillimanite, almandine-spessartine and fluorapatite. Columbite-tantalite crystals show coarse oscillatory zoning, usually with border parts enriched in Ta. Locally, there is a reversal trend of zoning (decrease of Ta towards the border parts), or irregular convoluted zoning as a result of latemagmatic to subsolidus dissolution-reprecipitation. The composition of columbite-tantalite shows a relatively constant Mn/(Mn + Fe) ratio (0.20-0.27, locally 0.35-0.40), but extreme variations of the Ta/(Ta + Nb) ratio (0.18-0.72). Ratios higher than 0.63 plot inside the tantalite-tapiolite miscibility gap. Ferrotapiolite is mainly homogenous and shows relatively consistent compositions with Mn/(Mn + Fe) = 0.03-0.04 and Ta/(Ta + Nb) = 0.88-0.97. Metamict zircon (5 to 120 μm in size) exhibits tiny uraninite inclusions, high Hf contents (6 to 23 wt. % HfO 2 , 0.06-0.23 Hf apfu), and locally elevated P, As and U contents, whereas Y and REE concentrations are low. Unusually widely variable and high Ta/Nb and Hf/Zr ratios in the accessory minerals are probably the product of extreme local Nb-Ta and Zr-Hf fractionation in highly peraluminous granite-pegmatite system.

show abstract

Textural Features and Chemical Evolution in Tantalum Oxides: Magmatic Versus Hydrothermal Origins for Ta Mineralization in the Tanco Lower Pegmatite, Manitoba, Canada

Cited by 154 publications

References 29 publications

Late Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa)

Late Neoproterozoic overprinting of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa)

Rare-element granitic pegmatite of Miocene age emplaced in UHP rocks from Visole, Pohorje Mountains (Eastern Alps, Slovenia): accessory minerals, monazite and uraninite chemical dating

Accessory columbite to tantalite, tapiolite and zircon: products of extreme fractionation in highly peraluminous pegmatitic granite from the Považský Inovec Mountains, Western Carpathians, Slovakia

Contact Info

Product

Resources

About