Y, REE-rich zirconolite from the Skalna Brama pegmatite near Szklarska Poręba (Karkonosze Massif, Lower Silesia, Poland)

SZELEG, Eligius a Radek ŠKODA. Y, REE-rich zirconolite from the Skalna Brama pegmatite near Szklarska Poręba (Karkonosze Massif, Lower Silesia, Poland). Mineralogia Polonica - Special Papers. Kraków: Wydawnictwo Naukowe "Akapit", 2008, roč. 28, č. 2, s. 159-160. ISSN 1896-2203.

Základní údaje

Originální název

Y, REE-rich zirconolite from the Skalna Brama pegmatite near Szklarska Poręba (Karkonosze Massif, Lower Silesia, Poland)

Název anglicky

Y, REE-rich zirconolite from the Skalna Brama pegmatite near Szklarska Poręba (Karkonosze Massif, Lower Silesia, Poland)

Autoři

SZELEG, Eligius a Radek ŠKODA

Vydání

Mineralogia Polonica - Special Papers, Kraków, Wydawnictwo Naukowe "Akapit" 2008, 1896-2203

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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

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/08:00036892

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

YREE-rich zirconolite; NYF pegmatite; Skalna Brama; Poland

Příznaky

Mezinárodní význam, Recenzováno

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Anotace

V originále

REE-bearing minerals from the Skalna Brama pegmatite were reported by Websky (1865), Traube (1888) and Gajda (1960 a,b). The pegmatite is located within granite of the Karkonosze Massif. It forms lens-like body up to 5 m thick with internal structure comprising from the rim inwards: granitic and graphic zone, blocky K-feldspar and massive quartz core. The rock-forming minerals of the pegmatite include quartz, microcline, oligoclase, biotite. Ilmenite, chlorite, hematite, gadolinite, fergusonite, monazite, zircon, xenotime, uraninite, pyrite and arsenopyrite are accessory minerals. Zirconolite was found as aggregates of needle-like branching crystals up to 4 cm long and up to 0.2 cm wide in massive pink microcline and grey quartz. It shows brown to black color and semi-vitreous to resinous lustre. A sequence of crystallization was determined using BSE images, performed by an ESEM- XL 30 TMP (Philips/FEI) SEM equipped with an EDS (EDAX) detector (Faculty of Earth Sciences, University of Silesia, Sosnowiec). Zirconolite is a first mineral in succession. Fergusonite, monazite, xenotime and zircon crystallized later. EMPA were carried out using a Cameca SX-100 (Masaryk University, Brno). Due to the metamict state, the analysis yield low totals (90-95 wt.% oxides). The composition of studied mineral shows a strong deviation from the stoichiometric composition CaZrTi2O7. The Ca and Zr are very low (0.07 and 0.58 apfu, respectively) and replaced by Y (0.60 apfu), REE (0.32 apfu; HREE>LREE), Sc (0.17 apfu) and U (0.12 apfu). The lowered Ti (1.23 apfu) is compensated by Nb (0.21 apfu), Ta (0.09 apfu) and Fe (0.36 apfu).

Anglicky

REE-bearing minerals from the Skalna Brama pegmatite were reported by Websky (1865), Traube (1888) and Gajda (1960 a,b). The pegmatite is located within granite of the Karkonosze Massif. It forms lens-like body up to 5 m thick with internal structure comprising from the rim inwards: granitic and graphic zone, blocky K-feldspar and massive quartz core. The rock-forming minerals of the pegmatite include quartz, microcline, oligoclase, biotite. Ilmenite, chlorite, hematite, gadolinite, fergusonite, monazite, zircon, xenotime, uraninite, pyrite and arsenopyrite are accessory minerals. Zirconolite was found as aggregates of needle-like branching crystals up to 4 cm long and up to 0.2 cm wide in massive pink microcline and grey quartz. It shows brown to black color and semi-vitreous to resinous lustre. A sequence of crystallization was determined using BSE images, performed by an ESEM- XL 30 TMP (Philips/FEI) SEM equipped with an EDS (EDAX) detector (Faculty of Earth Sciences, University of Silesia, Sosnowiec). Zirconolite is a first mineral in succession. Fergusonite, monazite, xenotime and zircon crystallized later. EMPA were carried out using a Cameca SX-100 (Masaryk University, Brno). Due to the metamict state, the analysis yield low totals (90-95 wt.% oxides). The composition of studied mineral shows a strong deviation from the stoichiometric composition CaZrTi2O7. The Ca and Zr are very low (0.07 and 0.58 apfu, respectively) and replaced by Y (0.60 apfu), REE (0.32 apfu; HREE>LREE), Sc (0.17 apfu) and U (0.12 apfu). The lowered Ti (1.23 apfu) is compensated by Nb (0.21 apfu), Ta (0.09 apfu) and Fe (0.36 apfu).