Apparent contradiction between tectonics and deposition in overturned strata — a case study from the “Moravian Culm” (Czech Republic)

Jiří Otava, Josef Havíř

Abstract


An apparent contradiction between structural and sedimentological indications commonly used for discrimination of the overturned and non-overturned beds during geological mapping was found at Paršovice, a site situated in the easternmost part of the European Variscides. An outcrop of folded Lower Carboniferous siliciclastic rocks  of the “Culm facies” lies on the NE margin of the Bohemian Massif, in the SE part of the Maleník Block (Moravia, Czech Republic). Flute casts in the steep overturned limb of a tectonic fold demonstrate the normal stratigraphic polarity of the bed. At the same site, a slump-related isoclinal fold was found. The apparent contradiction between structural (relation of cleavage and bedding) and sedimentological (flute casts on bed soles) indications is explained by a combination of successive phases of slump- and tectonically-related folding

 


Keywords


Culm facies; Variscan folding; slumping; stratigraphical polarity

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