International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

PRESSURE-SOLUTION AND CHEMICAL COMPACTION OF CONDENSED MIDDLE JURASSIC DEPOSITS, HIGH-TATRIC SERIES, TATRA MOUNTAINS

Pages: 91 - 102

Authors: PIOTR LUCZYNSKI

Abstract: Condensed Middle Jurassic deposits (Dunajec Group), outcropping in the High-Tatric tectonic units of the Tatra Mountains, were subjected to intensive pressure dissolution resulting in great thickness reduction. Crinoidal limestones of the Smolegowa Formation (Bajocian) lost about 20 % of their thickness. The Krupianka Formation (Bathonian) occurs in three lithofacies, differing in the intensity of pressure-solution phenomena. Chemical compaction of the Krupianka crinoidal limestones equalled >30 %, of stylonodular limestones — ~50 %, and of ferruginous limestones even — ~70 %. It differed in various tectonic units, probably due to different tectonic history. The ferruginous and stylonodular limestones owe their modern development to pressure-solution processes. The ferruginous limestones are highly enriched in elements resistant to dissolution. The stylonodular structure formed by selective dissolution of nodular limestones. Pre-compactional differences between the Krupianka Formation lithofacies were less evident than they are today.

Keywords: Central Western Carpathians, Tatra Mountains, condensed Middle Jurassic deposits, crinoidal limestones, compaction, pressure-solution

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