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Relative reactivation and kinematic potential analysis of some faults in the NE part of the Bohemian Massif

Havir J.

Geologia Sudetica

2014

Vol. 42

29--29

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

Otava J., Havir J.

Geological Quarterly

2006

Vol. 50, No. 3

391-396

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 Parsovice, a site situated in the easternmost part of the European Variscides. An outcrop of folded Lower Carboniferous siliciclastic rocks of the "Culm fades" lies on the NE margin of the Bohemian Massif, in the SE part of the Malenik 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.

The fabric of the Culm conglomerates in the eastern parts of the Nizký Jesenik and Drahany Uplands, eastern margin of the Bohemian Massif, the Czech Republic

Havir J.

Geologia Sudetica

1999

Vol. 32, nr 1

1-11

The fabric of the Culm conglomerates was studied by geometrical strain analysis methods in the eastern parts of the Nízký Jeseník and the Drahany Uplands on the eastern margin of the Bohemian Massif. The shapes and orientations of pebbles were used as strain markers and the average final ellipsoids (Shimamoto & Ikeda, 1976) were calculated (final fabric ellipsoids representing both depositional and deformational influence on the sediments). The geometric strain analysis shows a predominantly depositional or only partially deformational fabric. Only at some sites in the eastern part of the Nízký Jeseník Uplands a deformational fabric of the conglomerates occurs. But there is evidence of a very weak effect of ductile shortening in the Drahany Upland probably connected with rotation of the more rigid pebbles in the viscous graywacke matrix of the conglomerates. The orientations of the long axes of the final fabric ellipsoids are more or less uniform. The long axes are predominantly orientated N-S to NE-SW in the eastern parts of the Nízký Jeseník and the Drahany Uplands, which means nearly parallel to the major structures of the Variscan orogen in this region.