Lacustrine couplet-lamination: evidence for Late Pennsylvanian seasonality in central equatorial Pangaea (Stephanian B, Mšec Member, Central and Western Bohemian basins)

0357348 - GFÚ 2011 RIV CZ eng J - Journal Article
Lojka, R. - Sýkorová, Ivana - Laurin, Jiří - Matysová, Petra - Matys Grygar, Tomáš
Lacustrine couplet-lamination: evidence for Late Pennsylvanian seasonality in central equatorial Pangaea (Stephanian B, Mšec Member, Central and Western Bohemian basins).
Bulletin of Geosciences. Roč. 85, č. 4 (2010), s. 709-734. ISSN 1214-1119. E-ISSN 1802-8225
R&D Projects: GA AV ČR KJB307020601; GA AV ČR IAA300460804
Institutional research plan: CEZ:AV0Z30120515; CEZ:AV0Z30460519; CEZ:AV0Z40320502
Keywords : lamination * cyclicity * freshwater lake * dispersed organic matter * siderite * palaeoclimate
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.202, year: 2010

A large freshwater lake formed during the Stephanian B period of the late Pennsylvanian in the central east equatorial Pangaea and covered a substantial part of the continental Late Palaeozoic basins in the central Bohemian Massif. Lacustrine mudstones of the Mšec Member were acquired from two shallow boreholes 80 km apart and were analysed for lamination structure and periodicity, mineral composition and dispersed organic matter, in order to obtain more detailed information on the palaeoenvironmental change with a near annual resolution. Two hydrological states of the lake were identified, including high lake-level periods with dysoxic conditions on the lake floor, under a permanently thermally stratified hypolimnion favouring organic matter production and storage during periods of condensed sedimentation producing an irregular lamination pattern.
Permanent Link: http://hdl.handle.net/11104/0195643