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

Autoři ŽÁČEK Vladimír — ŠKODA Radek — SULOVSKY Petr
Druh Článek v odborném periodiku
Citace ŽÁČEK, Vladimír, Radek ŠKODA a 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, roč. 54, č. 4, s. 343-354. ISSN 1802-6222.
Originální jazyk angličtina
Obor Geologie a mineralogie
Klíčová slova 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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