General Characteristics

County (administration): Liberec Region
District (town): Jablonec nad Nisou
Cadastre: Rokytnice nad Jizerou
Map 1 : 50 000 (sheet No): 0341, 03411
Geological region: Lužice Pluton and Krkonoše-Jizera Massif; Krkonoše-Jizera crystalline complex
Accessibility: - no traffic restriction ( by car)
ID : 3636

Geology

Short characteristics of the site: Roadcutting show one of the best locality of calc-silicate rocks (erlans) on the map sheet Rokytnice n. Jizerou. The erlans layer is embedded within calcareous phyllites, close to the contact with orthogneiss. Small lenses of limestones are intercalated within erlan, bigger bodies are in the close proximity. The erlans are typically banded, the banding is caused by various content of K-feldspar and epidote (grey-greenish colour), vs. rose colour. The erlans contas a large amount of fine grained K feldspar, epidote, minor diopsid pyroxene, chlorite and titanite, Quartz and oqaque mineral are accessories.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Lugicum - Krkonoše-Jizerské hory Mts.crystalline complex
Stratigraphy: paleozoikum
Subject: geology, petrology
Geological phenomenon: horizontal section
Genesis: metamorphic (general metamorphism), metamorphic (contact metamorphism)
Rock: calc-silicate rock

Territorial conservation

Level of protection: Interesting geological localities in National park
Protection of a geol. phenomenon: C - Geological phenomenon is the reason for a registration in the database of CGS
Part of LEPA (Large-size especially protected areas): NP (National park) - Krkonoše
Conflicts of interests: road construction

References

Chaloupský, J., ed. (Ed.), 1989. Geologie Krkonoš a Jizerských hor. Ústř. Úst. geol.,, Praha, 288. pp.

Elaboration and Updating

Elaborated by: Kachlík Václav, 11.11.12

Citation

The database Significant geological localities of the Czech Republic: 3636 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-30]. Available from: http:// lokality.geology.cz/3636.

Location in map: