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U-Th-rich zircon, thorite and allanite-(Ce) as a main carriers of radioactivity in the highly radioactive ultrapotassic melasyenite porphyry from the Šumava Mts., Moldanubian Zone, Czech Republic

Basic information
Original title:U-Th-rich zircon, thorite and allanite-(Ce) as a main carriers of radioactivity in the highly radioactive ultrapotassic melasyenite porphyry from the Šumava Mts., Moldanubian Zone, Czech Republic
Authors:Vladimír Žáček, Radek Škoda, Petr Sulovsky
Further information
Citation:ŽÁČEK, Vladimír, Radek ŠKODA and Petr SULOVSKY. U-Th-rich zircon, thorite and allanite-(Ce) as a main carriers of radioactivity in the highly radioactive ultrapotassic melasyenite porphyry from the Šumava Mts., Moldanubian Zone, Czech Republic. Journal of Geosciences, 2009, vol. 54, No 4, p. 343-354. ISSN 1802-6222.Export BibTeX
@article{879321,
author = {Žáček, Vladimír and Škoda, Radek and Sulovsky, Petr},
article_number = {4},
keywords = {melasyenite porphyry; radioactivity; zircon; thorite; allanite-(Ce); Moldanubicum; Bohemian Massif},
language = {eng},
issn = {1802-6222},
journal = {Journal of Geosciences},
title = {U-Th-rich zircon, thorite and allanite-(Ce) as a main carriers of radioactivity in the highly radioactive ultrapotassic melasyenite porphyry from the Šumava Mts., Moldanubian Zone, Czech Republic},
volume = {54},
year = {2009}
}
Original language:English
Field:Geology and mineralogy
Type:Article in Periodical
Keywords:melasyenite porphyry; radioactivity; zircon; thorite; allanite-(Ce); Moldanubicum; Bohemian Massif

A melasyenite porphyry from the vicinity of Kašperské Hory (the Šumava Mts., Moldanubian Zone) shows a high natural radioactivity (K = 4.4-6.1 wt. %, eU = 15-24 ppm, eTh = 38-49 ppm). The most important carriers of U and Th are zircon, thorite, allanite-(Ce) and scarce monazite. Most of the zircon and thorite grains are altered by post-magmatic processes of due to which especially the zircon shows a large degree of chemical variability.

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