Česká geologická služba
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Libeč - melafyry

General Characteristics

County (administration): Hradec Králové Region
District (town): Trutnov
Cadastre: Libeč
Map 1 : 50 000 (sheet No): 0342, 03424
Geological region: Permo-Carboniferous of the Krkonoše-piedmont and Lower Silesian basins
Accessibility: - no traffic restriction ( by car)
Technical object: guarry
Excursion locality: yes
ID : 3378

Geology

Short characteristics of the site: Bohemian part of the Intrasudetic Basin, Upper Carboniferous. Basaltandesite (melaphyre) part of the Petrovice Beds of the Žacléř Formation. Two lava flows can be recognized, lower one with distinct columnar jointing. Upper flow is in contact with overlying sandstones of the Petrovice Beds. Basaltandesite is fine-grained, of microporphyric up to porphyric texture, and with intersertal groundmass. Some phenocrysts, as calcite-limonite pseudomorphs after olivine, are abundant.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Upper Carboniferous and Permian - Lugic Late Palaeozoicum (including Triassic deposits)
Stratigraphy: paleozoikum - karbon - svrchní karbon - siles
Subject: petrology
Geological phenomenon: lava flow
Genesis: volcanic
Rock: melaphyre, basalt

Territorial conservation

Level of protection: Registered interesting geological localities
Protection of a geol. phenomenon: C - Geological phenomenon is the reason for a registration in the database of CGS
Part of the Geopark: Broumovsko
Conflicts of interests: without conflicts

References

Holub, V. (1961): Karbonský vulkanismus v české části vnitrosudetské deprese.–Acta Mus. Reginaehradec., S.A., Sci. natru., 3, 1–2. Hradec Králové.

Elaboration and Updating

Elaborated by: Tasáryová Zuzana, 11.01.12
Updated by: Kukal Zdeněk 26.11.12

Citation

The database Significant geological localities of the Czech Republic: 3378 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-20]. Available from: http:// lokality.geology.cz/3378.

Location in map:

Links to neighbouring localities within 2 km radius are available on mouse click in the map window.
Sloupcovitá odlučnost spodního lávového proudu. , Zuzana Tasáryová, 2011


(C) 2003-2012 ČGS, verse aplikace 1.21 [3.2.2016]