Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Dyke rocks documented in highway tunnels Panenská and Libouchec in eastern Krušné hory/Erzgebirge Mts.
Abstract
A number of Variscan dykes has been documented during construction of the highway tunnels Panenská and Libouchec and adjacent excavations for the Highway D8 in the eastern Krušné hory/Erzgebirge Mts. One group of dykes with typical thickness of about 10 m or more comprises various acid rocks dominated by felsitic granite porphyries. The other one belongs to mica lamprophyres, represented by two varieties of minette. The prevailing one corresponds with common mafic minette rich in biotite and pseudomorphs after clinopyroxene and olivine. The second variety is rather felsic minette with pronounced spherulitic texture and much more evolved chemical composition when compared with a great majority of minettes from the Bohemian massif.
