Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
The age of fenites from Hůrky in the Čistá massif in the light of compositions of detrital rocks in their foreground, W-Bohemia
Abstract
Published radiometric datings gave values of 289 to 300 Ma (= Lower Permian) for the fenitized facies occurring in the NW margin of the Čistá massif. For clastic sediments adjacent to the massif in N and NW, the Upper Carboniferous age (Bolsovian + Asturian + Cantabrian + Barruelian (~312 to 304 Ma) is mostly claimed. New pebble analyses of these sediments, however, proved the presence of fenitized clasts in them. This fact confronts the geologists with the controversial problem which of these two statements should be taken for correct: the radiometric data of fenites or the current stratigraphic alignment of their Permo-Carboniferous apron? Modernized radiometric analyses replacing the old ones seem to be urgent.
