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

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Authors	ŽÁČEK Vladimír ŠKODA Radek SULOVSKY Petr
Year of publication	2009
Type	Article in Periodical
Magazine / Source	Journal of Geosciences
MU Faculty or unit	Faculty of Science
Citation
Field	Geology and mineralogy
Keywords	melasyenite porphyry; radioactivity; zircon; thorite; allanite-(Ce); Moldanubicum; Bohemian Massif
Description	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.
Related projects:	The interaction of metamict minerals and hydrothermal fluids and its significance in the geological environment