Siliciclastics in the Upper Triassic dolomite formations of the Krizna Unit (Maid Fatra Mountains, Western Carpathians): constraints for the Carnian Pluvial Event in the Fatric Basin

0360817 - GLÚ 2012 RIV SK eng J - Journal Article
Sýkora, M. - Siblík, Miloš - Soták, J.
Siliciclastics in the Upper Triassic dolomite formations of the Krizna Unit (Maid Fatra Mountains, Western Carpathians): constraints for the Carnian Pluvial Event in the Fatric Basin.
Geologica Carpathica. Roč. 62, č. 2 (2011), s. 121-138. ISSN 1335-0552. E-ISSN 1336-8052
Institutional research plan: CEZ:AV0Z30130516
Keywords : Carnian event * Upper Triassic dolomites * Western Carpathians * Krizna Unit * shaly interbeds * lingulids * conchostracans
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 0.787, year: 2011
http://arl-repository.lib.cas.cz/uloziste_av/GLU-S/cav_un_epca-0360817_01.pdf http://arl-repository.lib.cas.cz/uloziste_av/GLU-S/cav_un_epca-0360817_02.pdf

The Upper Triassic carbonates of the Krizna Unit in the eastern part of the Krivanska Mala Fatra Mts contain the unique siliciclastic interbeds. They are developed between the Ramsau Dolomite Formation and the Hauptdolomite Formation, and comprise alternating dark grey shales and pale grey dolomites. Such a shaly-dolomite formation is unknown from the Upper Triassic formations of the Krizna Unit, which makes it possible to define a new lithostratigraphic unit (Triznovo Formation). The Ramsau Dolomites beneath the Trzinovo Formation contain microfauna of Carnian foraminifers. Therefore, the Carnian age has also been constrained for the Triznovo Formation, which by the reduced carbonate productivity and enhanced terrigenous influx could be related to the Reingraben Event. This event related to the "Carnian Pluvial Episode" is also inferred in the Trzinovo Formation by the presence of lingulide brachiopods (Lingularia) and spinicaudatan crustaceans (Euestheria). This fauna provides evidence of not fully marine conditions of the Trzinovo Formation, influenced by continental freshwater influx and humid climate.
Permanent Link: http://hdl.handle.net/11104/0198279