Uranium-rich monazite-(Ce) from the Krivá type granitic boulders in conglomerates of the Pieniny Klippen Belt, Western Carpathians, Slovakia : composition, age determination and possible source areas

• Autorzy: Uher P. , Plašienka D. , Ondrejka M. , Hraško L. , Konečný P.
• Języki publikacji: EN

Abstrakty

EN

Monazite-(Ce) is a widespread accessory mineral in granitic cobbles of the Krivá type (Zástranie and Krivá localities) in polymict conglomerates of Cretaceous flysch sequences, the Pieniny Klippen Belt, Western Carpathians, NW Slovakia. The granites show leucocratic muscovite-biotite granodiorite composition and peraluminous calc-alkaline, S-type character. The monazite contains unusually high U, commonly 1 to 3, and in some places up to 6.6 wt.% UO₂, together with 5 to 7.7 wt.% ThO₂. A cheralite-type substitution [Ca(U,Th)REE_–2 is the dominant mechanism of U⁴⁺ + Th⁴⁺ incorporation into the monazite structure in the Zástranie sample, whereas both cheralite- and huttonite-type substitution [(Th,U)SiREE–1P–1] are evident in the Krivá granitic cobble. Uranium alone prefers the CaU⁴⁺(REE)_–2 mechanism, whereas Th favours the huttonite substitution. The chemical U-Th-Pb dating of monazite from both granitic cobbles show an Early Carboniferous age (346 ± 2 Ma), which is consistent with the main meso-Variscan, orogen-related plutonic activity in the Central Carpathian area (Tatric and Veporic superunits). Analogous U-rich monazites were detected in some Variscan S-type leucogranites of the Rimavica massif (South Veporic Unit) and the Bojná and Bratislava massifs (northern part of the Tatric Unit). On the basis of structural and palaeogeographic data, the North Tatric Zone is the most plausible source of the monazite-bearing granitic boulders in the Pieniny Klippen Belt. However, the source granitic body was most likely hidden by ensuing tectonic shortening along the northern Tatric edge after deposition of the Coniacian–Santonian Upohlav type conglomerates.

Słowa kluczowe

EN

uranium-rich monazite; granite; conglomerate; monazite dating; Pieniny Klippen Belt; Western Carpa

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2013
• Tom: Vol. 57, No. 2
• Strony: 343–--352
• Opis fizyczny: Bibliogr. 52 poz., rys., wykr.

Twórcy

autor

Uher P.

• Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G, 842 15 Bratislava, Slovakia

autor

Plašienka D.

• Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mlynská dol ina G, 842 15 Bratislava, Slovakia

autor

Ondrejka M.

• Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G, 842 15 Bratislava, Slovakia

autor

Hraško L.

• State Geological Institute of Dionýz Štúr, Mlynská dolina 1, 817 04 Bratislava, Slovakia

autor

Konečný P.

• State Geological Institute of Dionýz Štúr, Mlynská dolina 1, 817 04 Bratislava, Slovakia

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