Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Quartzites of the Moldanubian Zone in the area between Pelhřimov and Votice


Miloš René

Geoscience Research Reports 36, 2003 (GRR for 2002), pages 35–37

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The quartzites form relatively rare intercalations in the metapelites of the Moldanubian Zone. These metasediments could be divided in two larger groups. First group occur on the boundary of the Monotonous and the Varied Groups. The second forms intercalations in paragneisses of the Varied Group, together with intercalations of marbles and calc-silicate rocks. Modal composition enables to divide all quartzites in accordance with variable content of biotite, muscovite, garnet, pyroxene and amphibole. Particular type are the pyroxene- and pyroxene-biotite quartzites with higher amount of CaO, FeO, MgO and Ni. These quartzites are probably a metamorphic equivalent of chemogenic siliceous sediments with important proportion of dolomite cement. Other varieties of quartzites are the product of regional metamorphosis of clastic sediments. Their likely source was acid calc-alkaline magmatic rocks.