Publication details

Geometrie kvarcitových těles v okolí Příchovic

Title in English Geometry of quartzite bodies from Příchovice surroundings

UHLÍŘ Michal MELICHAR Rostislav

Year of publication 2017
Type Article in Periodical
Magazine / Source Geologické výzkumy na Moravě a ve Slezsku
MU Faculty or unit

Faculty of Science

Field Geology and mineralogy
Keywords Lugicum; Krkonoše-Jizera Crystalline Unit; quartzite; fold; structural analysis
Description Muscovite quartzite from Krkonoše-Jizera crystalline unit in SE surrounding of Příchovice village forms irregular shapes in detailed geological maps. To find correct 3D geometry of the bodies, we used standard methods of detailed mapping and documentation of outcrops as well as detailed structural analysis. Locations of terrain edges with quartzite outcrops have been indicated in the map. Generaly sub-horizontal to moderately dipping metamorphic foliation has been found. Foliation poles make wide girdle in the plot which indicates sub-cylindrical fold structure with horizontal axis in the NW-SE direction. The northeastern part of the territory is sub-horizontal plateau, while the southwestern part is generally inclined to the southwest. In the second part, the metamorphic foliation dips to the southwest under such angle, that it seems to be parallel to the inclination of the slope, see the old quarry and SW part of Velká bílá skála. The last one show us bent outcrop respecting the change in slope inclination. There was directly observed large shear bands as a part of S-C structure. It indicates that SW limb of the fold was strained under simple shear condition with the drop SW kinematics. Change in orientation of SW-dipping fold limb was produced by a ductile shear zone. Based on a combination of metamorphic foliation orientation quartzite and field edges, we can interpret quartzite rocks as a part of one platy body, which forms the overall morphology of the landscape south of Příchovice. In the plateau, erosion stopped at sub-horizontally oriented part of the quartzite layer, while denudation of the SW limb of the large fold predeterminates the inclined slope surface to the SW. A study has shown that such complex structure can be decrypted using the detailed structural analysis. In this case it was shown that quartzite forms relatively simple body which was only slightly bent due to simple shear deformation.

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