Vztah radioactivity a minerálního složení horniny na příkladu alkalicko živcového syenitu od Naloučan z gföhlské jednotky moldanubika
Článek v PDFThe correlation between radioactivity and mineral composition: an example from alkali feldspar syenites; Gföhl unit, Moldanubian zone
The leucocratic facies of the amphibol-bearing alkali feldspar syenites from Naloučany displays an extraordinary high content of radioactive elements – Th (up to 960 ppm) and U (up to 370 ppm). The elevated concentrations of Th (44-98 ppm) and U (10-40 pprn) are a typical feature of the whole body of alkali feldspar syenites. The Th and U concentrations display a direct dependence on the zircon content, and inherent souree of radioaetivity, inclusions of uranothorite. The unusual mineralogy and possible relations of the alkali feldspar syenites to the ultrapotassie, mafie magruas (HOLUB 1997) are the additional objects of this study.
Jaromír Leichmann, Dept. of Geology and Paleontology, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Jindřich Štelcl, Dept. of Mineralogy, Petrography and Geochemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Kateřina Zachovalová, Dept. of Mineralogy, Petrography and Geochemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic