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Titanite and polycrase

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Journal Article
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 361–378.
...John F. Slack; John N. Aleinikoff; Harvey E. Belkin; C. Mark Fanning; Paul W. Ransom Abstract Small polycrasetitanite veins 0.1–2 mm thick cut the tourmalinite feeder zone in the deep footwall of the Sullivan Pb–Zn– Ag deposit, southeastern British Columbia. Unaltered, euhedral crystals...
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Journal Article
Published: 01 February 1919
American Mineralogist (1919) 4 (2): 11–13.
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SEM images showing locations of SHRIMP analytical spots and U–Pb ages of re...
Published: 01 April 2008
F ig . 7. SEM images showing locations of SHRIMP analytical spots and U–Pb ages of representative grains of polycrase and titanite from the Sullivan deposit. A. BSE image of polycrase grain with subtle compositional zoning. B. BSE image of complex grain of polycrase partly replaced by titanite
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Scanning electron micrographs (all back-scattered electron images) of unalt...
Published: 01 April 2008
F ig . 2. Scanning electron micrographs (all back-scattered electron images) of unaltered and altered assemblages in polycrasetitanite veins. A. Coarse unaltered polycrase replaced internally and marginally by titanite. B. Unaltered polycrase intergrown with euhedral titanite replaced
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SHRIMP  207 Pb/ 206 Pb ages obtained on grains of unaltered and altered pol...
Published: 01 April 2008
) and references therein. Inset A. Age versus U concentration. Open circles are data from oscillatory-zoned (unaltered) polycrasetitanite); filled squares are data from patchily zoned (altered) polycrase. Inset B. Concordia plot of isotopic data for titanite. Weighted average is calculated for 207 Pb/ 206
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A. Photomicrograph of thin <span class="search-highlight">polycrase</span>–<span class="search-highlight">titanite</span> vein in fine-grained tourmali...
Published: 01 April 2008
F ig . 1. A. Photomicrograph of thin polycrasetitanite vein in fine-grained tourmalinite from the footwall of the Sullivan Pb–Zn–Ag deposit. B. Detail of A showing concentrations of tourmaline along margins of the vein.
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Compositions of tourmaline from margins of <span class="search-highlight">polycrase</span>–<span class="search-highlight">titanite</span> veins compare...
Published: 01 April 2008
F ig . 6. Compositions of tourmaline from margins of polycrasetitanite veins compared to those in the host footwall tourmalinite and elsewhere in the Sullivan deposit. Data fields for hanging-wall and footwall tourmalinites are taken from Jiang et al. (1998) .
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SHRIMP U-Th-Pb DATA FOR <span class="search-highlight">POLYCRASE</span> AND <span class="search-highlight">TITANITE</span> FROM THE SULLIVAN Pb-Zn-Ag D...
Published: 01 April 2008
TABLE 3. SHRIMP U-Th-Pb DATA FOR POLYCRASE AND TITANITE FROM THE SULLIVAN Pb-Zn-Ag DEPOSIT
Journal Article
Published: 01 June 2017
Mineralogical Magazine (2017) 81 (3): 591–610.
... at Piława Górna, Lower Silesia, SW Poland. The mineral occurs along with (Al,Ta,Nb)- and (Al,F)-bearing titanites, a pyrochlore-supergroup mineral and a K-mica in compositionally inhomogeneous aggregates, ∼120 μm × 70 μm in size, in a fractured crystal of zircon intergrown with polycrase-(Y) and euxenite-(Y...
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SEM micrograph of the <span class="search-highlight">titanite</span> crystals in the albitized zones being replac...
Published: 01 August 2012
Fig. 8 SEM micrograph of the titanite crystals in the albitized zones being replaced by a fine-grained association of niobian rutile (with ilmenite exsolution-induced lamellae), thorutite, polycrase-(Y), and uranopolycrase. The gray host mineral is allanite-(Ce).
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Position of żabińskiite in the crystallization sequences of (Fe,Mn)–(Ti,Sn)...
Published: 01 June 2017
range in which żabińskiite crystallized coevally with polycrase-(Y) and euxenite-(Y). Abbreviations: CG – columbite-group minerals; IG – ixiolite-group minerals; SG – samarskite-group minerals; FG – fergusonite-group minerals; WG – wodginite-group minerals. Symbols: black solid arrows – evolution trends
Journal Article
Published: 01 January 2002
European Journal of Mineralogy (2002) 14 (1): 141–150.
... aeschynite-(Y) from Evje-Iveland. Values used in normalizing REE were taken from Boynton (1984) . On the basis of its chemical composition, the pre-metamict mineral from Evje-Iveland could be classified as aeschynite-(Y) ( Pnma space group), or as the chemically equivalent mineral polycrase-(Y...
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Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 1055–1076.
...Fig. 8 SEM micrograph of the titanite crystals in the albitized zones being replaced by a fine-grained association of niobian rutile (with ilmenite exsolution-induced lamellae), thorutite, polycrase-(Y), and uranopolycrase. The gray host mineral is allanite-(Ce). ...
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Journal Article
Published: 13 December 2005
Canadian Journal of Earth Sciences (2005) 42 (10): 1849–1864.
... minéralisations au sud de la zone minéralisée ( Cayer 2001 ). Bien que la magnétite ait clairement subi une phase de déformation ductile, les datations U/Pb de l’allanite, de la titanite et de la pérovskite des indices Josette et Grabuge donnent des âges respectifs de 972 et 951 Ma, ce qui suggère une mise en...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1695–1712.
... replacement units located at the boundary of the core and intermediate zone on the footwall side of the core, where aeschynite-(Y), euxenite-(Y), polycrase-(Y), and betafite occur ( Hanson et al. 2007 ) ( Fig. 2b ). Accessory Fe–Ti oxides and very minor apatite, titanite, zircon, thorogummite and uraninite...
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Journal Article
Journal: Economic Geology
Published: 24 August 2020
Economic Geology (2020) 115 (8): 1699–1724.
... at Sullivan LeCouteur ( 1979 ) 1413 ± 4 U-Pb Polycrase Footwall polycrase-titanite vein at Sullivan Slack et al. ( 2008 ) 1413 ± 8 U-Pb Monazite Lower (?) Aldridge Formation McFarlane ( 2015 ) 1380-1325 U-Pb Monazite Lower (?) Aldridge Formation McFarlane ( 2015 ) 1375 ± 23 U-Pb...
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Journal Article
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 879–898.
...Adam Szuszkiewicz; Adam Pieczka; Eligiusz SzeŁĘg; Krzysztof Turniak; Sławomir Ilnicki; Krzysztof Nejbert Abstract Polycrase-(Y) and euxenite-(Y) represent the euxenite-group minerals (EGM) that formed as magmatic minerals in the sequence of (Y,REE,U,Th)–(Nb,Ta,Ti) oxides: columbite-(Fe) → Ti...
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Journal Article
Published: 01 October 2015
Mineralogical Magazine (2015) 79 (5): 1039–1059.
.../polycrase-(Y), ~20 μm in size, in metamorphosed A-type granites of the Turčok massif, Slovakia. Papoutsa and Pe-Piper ( 2013 ) found, in the Wentworth granite, that aeschynite-(Y) occurs only in close proximity to, and post-dated, titanite. They suggested that breakdown of titanite to a TiO 2 phase...
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Journal Article
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 395–402.
... of crustal rocks, totally unrelated to mantle-derived alkaline magmas. F ig . 1. Location of the mineral sampling area investigated; the map is from Vertolli et al. (1998) . The calcite vein-dikes at Bear Lake host the minerals apatite-(CaF), amphibole, titanite, and feldspar group...
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Journal Article
Published: 29 March 2022
The Canadian Mineralogist (2022) 60 (2): 229–248.
...), fergusonite, and polycrase are commonly associated minerals, whereas xenotime-(Y), schorl, fluorite, magnetite, rutile, zircon, and titanite are present in minor quantities. Pegmatites with substantial Be mineralization are noted for the presence of green, yellow-green, or blue beryl, sometimes accompanied...
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