Vol 30, (1989)

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Category: Vol 30, (1989)

• Permo-Carboniferous
• West and Central Bohemia
• Geological structure
• limnic
• Variscan
• orogeny
• tuff

Authors: Jiří Pešek & Radko Tásler

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 Abstract: The Variscan orogeny was associated with intense volcanic activity, the evidence of which may be found in Paleozoic sediments on all continents. In Czechoslovakia, evidence of this orogeny has been found in most of the Carboniferous and Permo-Carboniferous basins of the Bohemian Massif. In the sedimentary fill of the Upper Paleozoic limnic basins in which the present authors studied in detail the manifestations of the subsequent Variscan volcanism, partly volcanics and partly their pyroclastics are encountered. As far as their mineral composition, rather acid volcanics and their tuffs and tuffites prevail in the units examined. The frequency of occurrences of intermediate and basic rocks is usually less. In the limnic Upper Paleozoic in Bohemia and Moravia numerous manifestations of synchronous volcanism are known especially in the basins of the central Bohemian and the Lugicum regions. Less frequently, these events have also been found in the basins of the Krušné hory region and in the sediments of the Boskovice Furrow. In further Upper Paleozoic limnic basins and areas in Bohemia and Moravia no Upper Paleozoic volcanogenic rocks hove so far been reported.