Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Ultrabasic rocks of the basement below the Tertiary volcanites of the Doupovské hory Mts.
Abstract
A geological unit comparable to the Mariánské Lázně Complex is situated below the Tertiary volcanites of the Doupovské hory Mts. Its extension is known mainly from the borehole data and xenolites. It is outcropping only in one small area at the western foot of the Doupovské hory Mts. and from the Mariánské Lázně Complex is separated by the Nejdek-Eibenstock pluton. Relics of silicites and chalcedony as the product of fossil weathering have been found over the serpentinites. Silicites contain abundant grains of Cr-bearing magnetite up to 2 mm of size, with 4-5 % Cr203. Similar erosion-resistant products of weathering of ultrabasic rocks were described elsewhere as birbirite (Duparc et al. 1927).
