ISSN
print 2570-7337
online 2570-7345
Association of Nb-Ta-(Ti-REE) oxide minerals in the Maršíkov – Lysá hora pegmatite in Hrubý Jeseník Mountains, Czech Republic
Keywords
Abstract
Accessory Nb-Ta-Ti-REE oxide minerals were detected in recently described granitic pegmatite of the beryl-columbite subtype at Maršíkov – Lysá hora, northern Moravia, Czech Republic. Primary magmatic mineral assemblage is represented by columbite-group minerals, rutile and aeschynite-group minerals in the blocky and albite (cleavenlandite) textural-paragenetic units. Columbite-(Fe) is the most common Nb-Ta mineral whereas rare columbite-(Mn) occurs only in the cleavenlandite unit. Columbite-group minerals shows a lower degree of fractionation; Ta↔Nb and Mn↔Fe are dominant major element substitution mechanisms, minor Ti enters into the columbite lattice via rutile substitution: 3Ti4+ ↔ (Fe,Mn)2+ + 2(Nb,Ta)5+. Very rare aeschynite-(Ce) occurs in association with rutile and in Nb-rich rutile. The magmatic Nb-Ta-Ti assemblage underwent a significant transformation during post-magmatic to hydrothermal stage of the pegmatite evolution. Breakdown products of primary precursors are minerals of pyrochlore supergroup, they occur on the tiny cracks of the zonal columbite-(Fe) and rutile. Secondary phases of betafite and pyrochlore group-minerals show significant uranium enrichment. High contents of Si and Al in the pyrochlore-supergroup minerals are consistent with their hydrothermal-metasomatic origin and crystallization of late alpine-type alpine paragenesis on cracks in the pegmatite body.
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References
Atencio D., Andrade B., Christy A., Gieré R., Kartashov P. (2010) The pyrochlore supergroup of minerals: Nomenclature. Can. Mineral. 48, 673-698.
Beurlen H., Soares D. R., Thomas R., Prado-Borges L. E., Castro C. (2005) Mineral chemistry of tantalate species new in the Borborema Pegmatitic Province, Northeast Brazil. Annals of the Brazilian Academy of Sciences 77, 169-182.
Bonazzi P., Bindi L., Zoppi M., Capitani G. C., Olmi F. (2006) Single-crystal diffraction and transmission electron microscopy studies of “silicified” pyrochlore from Narssârssuk, Julianehaab district, Greenland. Am. Mineral. 91, 794-801.
Černý P. (1991) Rare-element granitic pegmatites II: Regional to global environments and Petrogenesis. Geosc. Canada 18, 68-81.
Černý P., Ercit T. S. (1989) Mineralogy of Niobium and Tantalum: crystal chemical relationships, paragenetic aspects and their economic implications. In: Möller P., Černý P., Saupé F. (ed.): „Lanthanoides, Tantalum and Niobium“, 27-79. Springer-Verlag. Heidelberg.
Černý P., Novák M., Chapman R. (1992) Effects of sillimanite-grade metamorphism and shearing on Nb,Ta-oxide minerals in granitic pegmatites: Maršíkov, northern Moravia, Czechoslovakia. Can. Mineral. 30, 699-718.
Černý P., Novák M., Chapman R. (1995) The Al (Nb,Ta) Ti-2 substitution in titanite: the emergence of a new species? Mineral. Petrol. 52, 61-73.
Ercit T. S. (1994) The geochemistry and crystal chemistry of columbite-group minerals from granitic pegmatites, southwestern Grenville Province, Canadian Shield. Can. Mineral. 32, 421-438.
Hatert F., Burke E. A. J. (2008) The IMA-CNMNC dominant-constituent rule revisited and extended. Can. Mineral. 46, 717-728.
Hogarth D. D. (1977) Classification and nomenclature of the pyrochlore group. Am. Mineral. 62, 403-410.
Chakhmouradian A. R., Mitchell R. H. (2002) New data on pyrochlore and perovskite-group minerals from the Lovozero alkaline complex, Russia. Eur. J. Mineral. 14, 821-836.
Chládek Š. (2011) Mineralogická charakteristika pegmatitu na Lysé hoře u Maršíkova v Hrubém Jeseníku. MS, bakalářská práce, PřF UP Olomouc.
Chládek Š. (2014) Primární a sekundární trendy ve vývoji Nb-Ta oxidických minerálů v pegmatitu na lokalitě Schinderhübel u Maršíkova. MS, diplom. práce, PřF UP Olomouc.
Chládek Š., Zimák J. (2012) Unikátní nález berylu v pegmatitu na Lysé hoře u Maršíkova. Minerál 20, 6, 488-494.
Johan V., Johan Z. (1994) Accessory minerals of the Cínovec (Zinnwald) granite cupola, Czech republic, Part 1: Nb-, Ta- and Ti-bearing oxides. Mineral. Petrol. 51, 323-343.
Lumpkin G. R., Ewing R. C. (1995) Geochemical alteration of pyrochlore group minerals: pyrochlore subgroup. Am. Mineral. 80, 732-743.
Nejezchlebová L., Zimák J., René M. (2012) Granitoidy intruze Rudné hory v Hrubém Jeseníku a jejich akcesorie. Zpr. Vlastivěd. Muz. Olomouc 303, 113-117.
Novák M. (2005) Granitické pegmatity Českého masivu (Česká republika), mineralogická, geochemická a regionální klasifikace a geologický význam. Acta Mus. Moraviae, Sci. geol. 90, 3-74.
Novák M., Černý P., Uher P. (2003a) Extreme variation and apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite pegmatite, Maršíkov, Czech Republic. Eur. J. Mineral. 15, 565-574.
Novák M., Nepejchal M., Škoda R., Urbánek B. (2003b) Beryl-columbitový pegmatit z Branné, Hrubý Jeseník. Acta Mus. Moraviae, Sci. Geol. 88, 113-122.
Mokhov A. V., Kartashov P. M., Bogatikov O. A., Ashikhmina N. A., Magazina L. O., Koporulina E. V. (2008) Fluorite, hatchettolite, calcium sulfate, and bastnasite-(Ce) in the lunar regolith from Mare Crisium. Doklady Earth Sciences 422, 1178-1180.
Štosová V. (2009) Mineralogie beryl-columbitových pegmatitů severovýchodní části Českého masivu. MS, diplom. práce, PřF UP Olomouc.
Uher P., Černý P., Chapman R., Határ J., Miko O. (1998) Evolution of Nb,Ta-oxide minerals in the Prašivá granitic pegmatites, Slovakia. II. External hydrothermal Pb,Sb overprint. Can. Mineral. 36, 535-545.
Urbánek B. (2005) Frakcionace Nb/Ta a Fe/Mn v minerálech skupiny columbitu z granitických pegmatitů Hrubého Jeseníku. MS, diplom. práce, PřF MU Brno.
Voloshin A. V., Pakhomovskiy Ya. A., Pushcharovskiy L. Yu., Nadezhina T. N., Bakhchisaraytsev A. Y., Kobyashev Yu. S. (1989) Strontium pyrochlore: composition and structure. Novye Dannye Mineral. SSSR. 36, 12-24.
Zimák J., Chládek Š. (2008) Beryl-columbitový pegmatit na Lysé hoře u Maršíkova. Minerál 16, 6, 491-493.