Arsenian monazite-(Ce) and xenotime-(Y), REE arsenates and carbonates from the Tisovec-Rejkovo rhyolite, Western Carpathians, Slovakia: Composition and substitutions in the (REE,Y)XO4 system (X = P, As, Si, Nb, S)

Ondrejka, Martin; Uher, Pavel; Pršek, Jaroslav; Ozdín, Daniel

doi:10.1016/j.lithos.2006.07.019

Cited by 62 publications

(45 citation statements)

References 18 publications

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“…6 Composition of pre-alpine monazite I and secondary sulphatian monazite II from the North Veporic orthogneisses in Sr + Ca + Th + U + Si vs. REE + Y + P + As substitution diagram (atomic proportions) with ideal huttonite/cheralite and clinoanhydrite* substitution vectors (straight lines). * Detailed information on the clinoanhydrite substitution mechanism in monazite-type structure minerals is in Ondrejka et al (2007) and Pršek et al (2010) the Variscan metamorphic overprint of these rocks and crystallization of younger anatectic pre-Alpine monazite. However, our attempt to chemically date secondary sulphatian monazite II in the Jaškovec orthogneiss was unsuccessful because of very low Th and U content (≤1.0 wt.% ThO 2 and ≤0.3 wt.% UO 2 ; Tab 3).…”

Section: Monazite Xenotime and Uraninite In Situ Chemical Datingmentioning

confidence: 99%

“…While sulphur concentration in monazite II has positive correlation with Ca, indicating Bclinoanhydrite^substitution: Ca 2+ + S 6+ = REE 3+ + P 5+ or Ca 2+ + (SO 4 ) 2− = REE 3+ + (PO 4 ) 3 − (Kukharenko et al 1965;Chakhmouradian and Mitchell 1999;Ondrejka et al 2007), the relatively high concentration of Ca (up to 5.1 wt.% CaO; 0.20 apfu Ca) and Ca surplus over S atoms (Ca:S = 1.12-2.28) signifies additional substitution mechanisms controlling Ca 2+ (+ Sr 2+ ) entry. However, cheralite substitution does not have an important role because actinide contents are very low (≤1.2 wt.% ThO 2 + UO 2 ; 0.01 apfu Th + U).…”

Section: Formation Of Sulphatian Monazitementioning

confidence: 99%

“…In addition, the presence of six-valent sulphur in monazite II and the occurrence of hydrothermal barite in the Jaškovec orthogneiss document the relatively high oxygen fugacity and sulphur activity during fluid-rock interaction (cf. Ondrejka et al 2007;Pršek et al 2010;Ondrejka et al 2013).…”

Section: Formation Of Sulphatian Monazitementioning

confidence: 99%

“…Phosphate and silicate minerals rich in REE and Y, especially monazite, xenotime, apatite and allanite, are among the most widespread accessory phases in common granitic and metamorphic rocks and their compositions and alterations are commonly used as petrogenetic indicators (e.g., Wark and Miller 1993;Petrík et al 1995Petrík et al , 2006Bea 1996;Gratz and Heinrich 1997;Heinrich et al Editorial handling: L. Nasdala Electronic supplementary material The online version of this article (doi:10.1007/s00710-016-0432-8) contains supplementary material, which is available to authorized users. 1997; Finger et al 1998;Förster 1998aFörster , b, 2006Poitrasson et al 2000Poitrasson et al , 2002Pyle et al 2001;Spear and Pyle 2002;Wing et al 2003;Kohn and Malloy 2004;Broska et al 2005;Johan and Johan 2005;Ondrejka et al 2007Ondrejka et al , 2012Berger et al 2008;Janots et al 2008;Uher et al 2009;Budzyń et al 2010Budzyń et al , 2011Harlov et al 2011;Middleton et al 2013 and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Fluid-driven destabilization of REE-bearing accessory minerals in the granitic orthogneisses of North Veporic basement (Western Carpathians, Slovakia)

et al. 2016

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A variety of rare earth elements-bearing (REE) accessory mineral breakdowns were identified in granitic orthogneisses from the pre-Alpine basement in the Veporic Unit, Central Western Carpathians, Slovakia. The Ordovician granitic rocks were subjected to Variscan metamorphic-anatectic overprint in amphibolite facies. Chemical U-Th-Pb dating of monazite-(Ce) and xenotime-(Y) reveal their primary magmatic Lower to Middle Ordovician age (monazite: 472 ± 4 to 468 ± 6 Ma and xenotime: 471 ± 13 Ma) and/or metamorphic-anatectic Variscan (Carboniferous, Visean) age (monazite: 345 ± 3 Ma). Younger fluid-rock interactions caused breakdown of primary magmatic and/or metamorphic-anatectic monazite-(Ce), xenotime-(Y), fluorapatite and allanite-(Ce). Fluid-induced breakdown of xenotime-(Y) produced numerous tiny uraninite inclusions within the altered xenotime-(Y) domains. The monazite-(Ce) breakdown produced secondary egg-shaped coronal structures of different stages with welldeveloped concentric mineral zones. Secondary sulphatian monazite-(Ce) (up to 0.15 apfu S) occasionally formed along fluorapatite fissures. Localized fluorapatite and monazite-(Ce) recrystallization resulted in a very fine-grained, nonstoichiometric mixture of REE-Y-Fe-Th-Ca-P-Si phases. Finally, allanite-(Ce) decomposed to secondary REE carbonate minerals (members of the bastnäsite and synchysite groups) and calcite in some places. Although the xenotime alteration and formation of uraninite inclusions is believed to be the result of dissolution-reprecipitation between early magmatic xenotime and late-magmatic granitic fluids, the monazite, apatite and allanite breakdowns were driven by metamorphic hydrothermal fluids. While earlier impact of postmagmatic fluids originated probably from Permian acidic volcanic and microgranitic veins crosscutting the orthogneisses, another fluid-rock interaction event most likely occurred during Late Cretaceous metamorphism in the Veporic basement and covering rocks. This stage indicates carbon-bearing fluids precipitating the carbonate minerals.

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Section: Monazite Xenotime and Uraninite In Situ Chemical Datingmentioning

confidence: 99%

Section: Formation Of Sulphatian Monazitementioning

confidence: 99%

Section: Formation Of Sulphatian Monazitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluid-driven destabilization of REE-bearing accessory minerals in the granitic orthogneisses of North Veporic basement (Western Carpathians, Slovakia)

et al. 2016

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“…Structural formulae of zircon and monazite were calculated on the basis of 4 atoms of oxygen in a formula unit (4 O apfu). The chemical composition of monazite, after subtraction of the clinoanhydrite component (Ondrejka et al 2007), was recalculated to the theoretical end-member composition monazite + cheralite + huttonice = 100 % (Linthout 2007).…”

Section: Methodsmentioning

confidence: 99%

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

Breiter

2016

Miner Petrol

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The chemical compositions of zircon and monazite and the relationships between the contents of Th, U, Y, and REE in both minerals and in the bulk samples of their parental rocks were studied in three Variscan composite peraluminous granite plutons in the Bohemian Massif. It was established that granites of similar bulk composition contain zircon and monazite of significantly different chemistry. Monazite typically contains 5-13 wt% (rarely up to 28 wt%) ThO 2 , 0.4-2 wt% (up to 8.2 wt%) UO 2 , and 0.5-2 wt% (up to 5 wt%) Y 2 O 3 , whereas zircon typically contains less than 0.1 wt% (rarely up to 1.7 wt%) ThO 2 , less than 1 wt% UO 2 (in the Plechý/Plockenstein granite, commonly, 1-2 wt% and scarcely up to 4.8 wt% UO 2 ), and less than 1 wt% Y 2 O 3 (in the Nejdek pluton often 2-5, maximally 7 wt% Y 2 O 3 ). Monazite is an essential carrier of thorium, hosting more than 80 % of Th in all studied granites. Monazite also appears to be an important carrier of Y (typically 14-16 %, and in the Melechov pluton, up to 81 % of the total rock content) and U (typically 18-35 % and occasionally 6-60 % of the total rock budget). The importance of zircon for the rock budget of all the investigated elements in granites is lower: 4-26 % U, 5-17 % Y, and less than 5 % Th.

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Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

Seydoux‐Guillaume

Bingen

Bosse

et al. 2017

Microstructural Geochronology

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Arsenian monazite-(Ce) and xenotime-(Y), REE arsenates and carbonates from the Tisovec-Rejkovo rhyolite, Western Carpathians, Slovakia: Composition and substitutions in the (REE,Y)XO4 system (X = P, As, Si, Nb, S)

Cited by 62 publications

References 18 publications

Fluid-driven destabilization of REE-bearing accessory minerals in the granitic orthogneisses of North Veporic basement (Western Carpathians, Slovakia)

Fluid-driven destabilization of REE-bearing accessory minerals in the granitic orthogneisses of North Veporic basement (Western Carpathians, Slovakia)

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

Transmission Electron Microscope Imaging Sharpens Geochronological Interpretation of Zircon and Monazite

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