Ložiska a výskyty nerostných surovin na území brdských Hřebenů a v jejich okolí (střední Čechy)

Pages

129-176

Citation

ŠREINOVÁ, Blanka, SEJKORA, Jiří, ČERNÝ, Pavel, LITOCHLEB, Jiří a KORBA, Milan. Ložiska a výskyty nerostných surovin na území brdských Hřebenů a v jejich okolí (střední Čechy). Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze. Prague: National Museum, 2012, 20(2), 129-176. ISSN 1211-0329 (print), 1804-6495 (online). Also available from: https://www.nm.cz/en/periodicals/bmpholnrhmvp/20-2/loziska-a-vyskyty-nerostnych-surovin-na-uzemi-brdskych-hrebenu-a-v-jejich-okoli-stredni-cechy

Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2012/20/2

The Brdy Mountains represent the only interior mountain range of Central Bohemia. Their NE part - the Hřebeny Mts. are almost 40 km long and cca 6 km wide range, that located between Vltava and Berounka rivers aber south of Prague and the Litavka river valley near Příbram and Jince. The area of Hřebeny Mts. and close neighbourhood are formed by Neoproterozoic volcano-sedimentary and sedi¬mentary formations of the Barrandian Unit, Lower Cambrian sediments (the Příbram - Jince basin) and above all the Ordovician sediments and volcanogenic rocks with iron ore bodies (the Prague basin). Relicts of Tertiary (Miocene and Pliocene) sediments occurr in NE part this area. From point of view exploitation and treatment of raw mineral materials in the Hřebeny Mts. area a dominant position in the past had gold (NE part of area) - gold-bearing placers and quartz (± sulphide) veins and iron (SW part of area) - Ordovician sedimentary oolitic iron ores (the Prague basin) and iron ore quartz-carbonate-Fe oxide veins of Variscan age (northern part of the Příbram iron ore district). Fossil placers between Vltava and Berounka rivers in the Prague vicinity above all represented in the past a significant source of easily workable gold. Source of gold for its origin in placers mostly of different morphogenetic types were Tertiary gold-bearing fluvial and lacustrine sediments of the Klínec Stage, transported and accumulated by Lower Miocene river from the east (from today´s the Jílové gold-bearing ore district), desintegrated and resedimented followed by in Quaternary originated hydrological pattern. Iron ores of both genetic types were by raw mineral materials base for a intensive development of iron metalurgy and ironmonger´s in the past. Veined uranium and base metals (± silver) ore mineralizations were by object of a geological exploration only with local exploitation (uranium ores). Mineralogical significance had occurrences of mercury mineralization. From next industrial raw mineral materials were exploited a building stones, gravels and sands, brick-clays, ceramic argils or glass, refractory Ordovician quartzites and coal. A gem stones are represented by occurrences of varied colored ferrigi¬nous quartz in vicinity Ordovician iron ores bodies and different varieties of quartz and chalcedony in relicts of Tertiary gravel sand sediments.

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