Blue, complexly zoned, (Na,Mg,Fe,Li)-rich beryl from quartz-calcite veins in low-grade metamorphosed Fe-deposit Skály near Rýmařov, Czech Republic

Syn-tectonic quartz-calcite veins containing blue beryl are enclosed in hematite > magnetite-rich portions of the low-grade metamorphosed Fe-deposit Skály near Rýmařov, Czech Republic. Aggregates of pale to deep blue beryl, up to 2 cm in diameter, are associated with euclase, clinochlore, hematit...

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Bibliographic Details
Published in:Mineralogy and petrology 2011-10, Vol.102 (1-4), p.3-14
Main Authors: Novák, Milan, Gadas, Petr, Filip, Jan, Vaculovič, Tomáš, Přikryl, Jan, Fojt, Bohuslav
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Geochemistry
Inorganic Chemistry
Metamorphic rocks
Mineralogy
Quartz
Special Issue Accessory Minerals
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Summary:Syn-tectonic quartz-calcite veins containing blue beryl are enclosed in hematite > magnetite-rich portions of the low-grade metamorphosed Fe-deposit Skály near Rýmařov, Czech Republic. Aggregates of pale to deep blue beryl, up to 2 cm in diameter, are associated with euclase, clinochlore, hematite, albite and dravite. Complexly zoned beryl crystals consist of skeletal aggregates of beryl I randomly distributed within volumetrically dominant beryl II with narrow rims of beryl III. All types of beryl have similar contents of Na (0.32–0.49 apfu) and Mg (0.31–0.41 apfu) but variable contents of Fe tot (0.05–0.34 apfu) and Al (1.20–1.62 apfu). The LA-ICP-MS study yielded elevated contents of Li, up 1,314 ppm (0.28 wt.% Li 2 O) in beryl I. The quartz-calcite veins represent an unusual type of low-T metamorphic-hydrothermal vein related to Fe-ore deposit characterized by single-stage fracturing and mobilization in a closed system at T~200–300°C and CO 3 2- as a major complexing agent for the mobility of Be.
ISSN:0930-0708
1438-1168
DOI:10.1007/s00710-011-0157-7