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Quantitative allochem compositional analysis of Lochkovian-Pragian boundary sections in the Prague Basin (Czech Republic)
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SYSNO ASEP 0476461 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Quantitative allochem compositional analysis of Lochkovian-Pragian boundary sections in the Prague Basin (Czech Republic) Author(s) Weinerová, Hedvika (GLU-S) SAI, ORCID
Hron, K. (CZ)
Bábek, O. (CZ)
Šimíček, D. (CZ)
Hladil, Jindřich (GLU-S) RID, SAISource Title Sedimentary geology. - : Elsevier - ISSN 0037-0738
Roč. 354, JUN 1 (2017), s. 43-59Number of pages 17 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords compositional analysis ; carbonate petrography ; multivariate statistics ; log-ratio coordinates ; Prague Basin ; Lower Devonian Subject RIV DB - Geology ; Mineralogy OECD category Geology R&D Projects GA14-18183S GA ČR - Czech Science Foundation (CSF) Institutional support GLU-S - RVO:67985831 UT WOS 000401597200004 EID SCOPUS 85017523327 DOI 10.1016/j.sedgeo.2017.04.002 Annotation Quantitative allochem compositional trends across the Lochkovian-Pragian boundary Event were examined at three sections recording the proximal to more distal carbonate ramp environment of the Prague Basin. Multivariate statistical methods (principal component analysis, correspondence analysis, cluster analysis) of point-counted thin section data were used to reconstruct facies stacking patterns and sea-level history. Both the closed-nature allochem percentages and their centred log-ratio (clr) coordinates were used. Both these approaches allow for distinguishing of lowstand, transgressive and highstand system tracts within the Praha Formation, which show gradual transition from crinoid-dominated fades deposited above the storm wave base to dacryoconarid-dominated facies of deep-water environment below the storm wave base. Quantitative compositional data also indicate progradative-retrogradative trends in the macrolithologically monotonous shallow-water succession and enable its stratigraphic correlation with successions from deeper-water environments. Generally, the stratigraphic trends of the clr data are more sensitive to subtle changes in allochem composition in comparison to the results based on raw data. A heterozoan-dominated allochem association in shallow-water environments of the Praha Formation supports the carbonate ramp environment assumed by previous authors. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2018
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