2007
MINERÁLNÍ ASOCIACE FOSFÁTOVÝCH NODULÍ Z GRANITICKÉHO PEGMATITU OD CYRILOVA U VELKÉHO MEZIŘÍČÍ, MOLDANUBIKUM; ČÁST I PRIMÁRNÍ A EXSOLUČNÍ FÁZE
ŠKODA, Radek, Josef STANĚK a Renata ČOPJAKOVÁZákladní údaje
Originální název
MINERÁLNÍ ASOCIACE FOSFÁTOVÝCH NODULÍ Z GRANITICKÉHO PEGMATITU OD CYRILOVA U VELKÉHO MEZIŘÍČÍ, MOLDANUBIKUM; ČÁST I PRIMÁRNÍ A EXSOLUČNÍ FÁZE
Název anglicky
Mineral assemblages of the phosphate nodules from the granitic pegmatite at Cyrilov near Velké Meziříčí, Moldanubicum; part I primary and exsolution phases.
Autoři
ŠKODA, Radek (203 Česká republika, garant), Josef STANĚK (203 Česká republika) a Renata ČOPJAKOVÁ (203 Česká republika)
Vydání
Acta Mus. Moraviae, Sci. geol. Brno, MZM Brno, 2007, 1211-8796
Další údaje
Jazyk
čeština
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Kód RIV
RIV/00216224:14310/07:00021976
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova anglicky
zwieselite; graftonite; sarcopside; wolfeite; triphylite; harrisonite; ixiolite; Nb-rich ferberite; Nd and Sm-rich monazite-(Ce); granitic pegmatite; Moldanubicum
Štítky
Příznaky
Recenzováno
Změněno: 16. 7. 2008 14:34, Mgr. Petr Bureš
V originále
Granitic pegmatite near Cyrilov, the type locality of cyrilovite, belongs to the beryl columbite phosphate subtype of the REL Li type, despite the absence of the beryl. The primary phosphates and associate minerals occur in two assemblages: i) zwieselite nodule minerals zwieselite, uraninite, ilmenite, ixiolite and Nb rich ferberite and ii) graftonite nodule minerals graftonite, sarcopside, wolfeite, triphylite, harrisonite, monazite (Ce) and xenotime (Y). The triphylite is completely altered to ferrisicklerite and heterosite. The solidification of the phosphate assemblages began with crystallization of zwieselite, which decreased the content of F in the melt; this allowed consequent graftonite crystallization. Graftonite crystallized as Li,OH rich precursor. In the graftonite nodule assemblage, exsolution proceeds in (at least) two stages: i) a Li,OH rich precursor unmixed to wolfeite, sarcopside I, graftonite II and to the precursor of triphylite and sarcopside II, ii) a further decrease of temperature induces an exsolution of triphylite and sarcopside II from their precursor. The genetic position of harrisonite is not clear. Subhedral monazite (Ce) associated with wolfeite, graftonite II and sarcopside I and worm like monazite (Ce) from triphylite sarcopside II intergrowths is rich in Nd (up to 20,35 wt.% Nd2O3) and Sm (uo to 10,47 wt.% Sm2O3). Based on the chemical composition of primary phosphates and Nb Ta Ti W oxides examined, the assemblage crystallize from Li poor melt with moderate content of F and low degree of Fe/Mn and Nb/Ta fractionation.
Anglicky
Granitic pegmatite near Cyrilov, the type locality of cyrilovite, belongs to the beryl columbite phosphate subtype of the REL Li type, despite the absence of the beryl. The primary phosphates and associate minerals occur in two assemblages: i) zwieselite nodule minerals zwieselite, uraninite, ilmenite, ixiolite and Nb rich ferberite and ii) graftonite nodule minerals graftonite, sarcopside, wolfeite, triphylite, harrisonite, monazite (Ce) and xenotime (Y). The triphylite is completely altered to ferrisicklerite and heterosite. The solidification of the phosphate assemblages began with crystallization of zwieselite, which decreased the content of F in the melt; this allowed consequent graftonite crystallization. Graftonite crystallized as Li,OH rich precursor. In the graftonite nodule assemblage, exsolution proceeds in (at least) two stages: i) a Li,OH rich precursor unmixed to wolfeite, sarcopside I, graftonite II and to the precursor of triphylite and sarcopside II, ii) a further decrease of temperature induces an exsolution of triphylite and sarcopside II from their precursor. The genetic position of harrisonite is not clear. Subhedral monazite (Ce) associated with wolfeite, graftonite II and sarcopside I and worm like monazite(Ce) from triphylite sarcopside II intergrowths is rich in Nd (up to 20,35 wt.% Nd2O3) and Sm (uo to 10,47 wt.% Sm2O3). Based on the chemical composition of primary phosphates and Nb Ta Ti W oxides examined, the assemblage crystallize from Li poor melt with moderate content of F and low degree of Fe/Mn and Nb/Ta fractionation.
Návaznosti
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