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Article

Niobium Mineralogy of Pliocene A1-Type Granite of the Carpathian Back-Arc Basin, Central Europe

1
Department of Mineralogy and Petrology, Comenius University, Faculty of Natural Sciences, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava 4, Slovakia
2
State Geological Institute of D. Štúr, Mlynská dolina, 817 04 Bratislava, Slovakia
3
Institute of Earth Sciences, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(8), 488; https://doi.org/10.3390/min9080488
Received: 15 July 2019 / Revised: 12 August 2019 / Accepted: 14 August 2019 / Published: 15 August 2019
(This article belongs to the Special Issue Accessory Minerals in Silicic Igneous Rocks)
A1-type granite xenoliths occur in alkali basalts erupted during Pliocene–Pleistocene continental rifting of Carpathian back-arc basin (Central Europe). The Pliocene (5.2 Ma) peraluminous calc-alkalic granite contains unusually high concentrations of critical metals bound in Nb, Ta, REE, U, Th-oxides typical for silica-undersaturated alkalic granites, and syenites: columbite-Mn, fergusonite-Y, oxycalciopyrochlore, Nb-rutile, and Ca-niobate (fersmite or viggezite). In contrast, it does not contain allanite and monazite—the main REE-carriers in calc-alkalic granites. The crystallization of REE-bearing Nb-oxides instead of OH-silicates and phosphates was probably caused by strong water deficiency and low phosphorus content in the parental magma. Increased Nb and Ta concentrations have been inherited from the mafic parental magma derived from the metasomatized mantle. The strong Al- and Ca-enrichment probably reflects the specific composition of the mantle wedge modified by fluids, alkalic, and carbonatitic melts liberated from the subducted slab of oceanic crust prior to the Pliocene-Pleistocene rifting. View Full-Text
Keywords: alkali basalt; columbite; granite; fergusonite; Pannonian Basin; pyrochlore; xenolith alkali basalt; columbite; granite; fergusonite; Pannonian Basin; pyrochlore; xenolith
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MDPI and ACS Style

Huraiová, M.; Konečný, P.; Hurai, V. Niobium Mineralogy of Pliocene A1-Type Granite of the Carpathian Back-Arc Basin, Central Europe. Minerals 2019, 9, 488. https://doi.org/10.3390/min9080488

AMA Style

Huraiová M, Konečný P, Hurai V. Niobium Mineralogy of Pliocene A1-Type Granite of the Carpathian Back-Arc Basin, Central Europe. Minerals. 2019; 9(8):488. https://doi.org/10.3390/min9080488

Chicago/Turabian Style

Huraiová, Monika, Patrik Konečný, and Vratislav Hurai. 2019. "Niobium Mineralogy of Pliocene A1-Type Granite of the Carpathian Back-Arc Basin, Central Europe" Minerals 9, no. 8: 488. https://doi.org/10.3390/min9080488

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