Publication details

Zelená slída s podílem chromu v balinských slepencích rosicko-oslavanského souvrství (svrchní karbon) u Oslavan

Title in English Green chromium-bearing mica in Balinka Conglomerates of Rosice-Oslavany formation (Upper Carboniferous) at Oslavany

HOUZAR Stanislav KOPEČNÁ Petra ŠTELCL Jindřich VÁVRA Václav

Year of publication 2013
Type Article in Periodical
Magazine / Source Acta Mus. Moraviae, Sci. geol.
MU Faculty or unit

Faculty of Science

Field Geology and mineralogy
Keywords muscovite; illite; chromium; conglomerates; Upper Carboniferous; Rosice-Oslavany Coalfield; Boskovice Graben
Description Clasts of light-green mica containing chromium were recorded in the Upper Carboniferous conglomerates at Oslavany (Rosice-Oslavany Coalfield, Boskovice Graben). It is a potassium-deficient muscovite to illite (0.514–0.912 apfu K) with 0.88–2.29 wt. % Cr2O3 (0.046–0119 apfu Cr). Slightly increased both Mg (0.180–0.440 apfu Mg) and Fe (0.151–0.169 apfu Fe) contents were also detected. Mica is very low in Ti (< 0.003 apfu), V (< 0.002 apfu), Mn (< 0.002 apfu) and F (<0.052 apfu); Ba lies below detection. The origin of the clastic material of the Balinka conglomerates can be found in the crystalline complexes in the vicinity. Chromium-bearing mica could originate from hydrothermally altered spinel peridotites or other ultramafics of adjacent Moldanubicum (Gföhl Unit) or Moravian unit.
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