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Der Keuper in der Stratigraphischen Tabelle von Deutschland 2016: kontinuierliche oder lückenhafte Überlieferung?

The Keuper Group in the Stratigraphic Table of Germany 2016: a continuous or discontinuous stratigraphic record?

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Kurzfassung: Der Keuper ist in der Stratigraphischen Tabelle von Deutschland 2016 durch zwei alternative Deutungen dargestellt. Modell A stellt eine Einschätzung der relativen Anteile von Akkumulation und Stasis im Becken dar, die auf ei- ner Abwägung der biostratigraphischen, zyklostratigraphischen und sedimentologischen Daten beruht. Modell B geht von einer nahezu kontinuierlichen Sedimentation im Beckeninneren aus (Franz et al. 2017, dieser Band). Beide Deutungen be- ruhen auf denselben biostratigraphischen Daten aus Palynomorphen, Tetrapoden, Mollusken und Conchostraken. Die Kor- relation mit der globalen Skala bleibt aber unsicher, ebenso die numerischen Alter der globalen Stufengrenzen. Nach sedi- mentologischen Merkmalen sind sehr geringe Akkumulationsraten nur für die spätkarnische Ablagerungen plausibel, während die Sedimente des Noriums offenbar rasch in wenigen kurzen Intervallen abgelagert wurden. Sie dürften selbst bei dem vergleichsweise kurzen Norium der ,,Long-Tuvalian-Option" der GTS 2012 nur einen Teil dieser Zeit repräsentieren. Nahezu beckenweite Paläoboden-Horizonte, die mit Diskordanzen auf Schwellenlagen und am Beckenrand korrelieren, stellen wichtige Stasis- und Erosionsflächen und damit Überlieferungslücken dar, die von der Biostratigraphie nicht erkannt werden können.

Abstract: In the Stratigraphic Table of Germany 2016, the Keuper Group is represented by two alternative interpretations. Model A is based on an estimate of the relative proportions of accumulation and stasis throughout the basin, derived from a combination of the biostratigraphic, cyclostratigraphic and sedimentological data. Model B assumes almost continuous sedimentation in the central parts of the basin, discussed by Franz et al. 2017 (this volume). Both interpretations are based on the same biostratigraphic data from palynomorphs, tetrapods, mollusks and conchostracans. However, the correlation between these schemes with the global timescale remains ambiguous and the numerical ages of the global stage boundaries are still uncertain. Very low accumulation rates only seem plausible for the Late Carnian sediments from a sedimentological point of view, whereas the Norian deposits seem to have accumulated more rapidly in several short intervals. Even if the "Long Tuvalian Option" of GTS 2012 is used, it does not seem likely that they represent all of the Norian time. Basin-wide palaeosols and corresponding unconformities at uplifts and basin margins represent significant stasis and erosion surfaces and probably hiatuses not resolved by biostratigraphy.
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Keywords: BIOSTRATIGRAPHIE; BIOSTRATIGRAPHY; CHRONOSTRATIGRAPHIE; CHRONOSTRATIGRAPHY; CYCLOSTRATIGRAPHY; KEUPER; LITHOSTRATIGRAPHIE; LITHOSTRATIGRAPHY; STD 2016; STRATIGRAPHIC COMPLETENESS; STRATIGRAPHISCHE VOLLSTÄNDIGKEIT; TRIAS; TRIASSIC; ZYKLOSTRATIGRAPHIE

Document Type: Research Article

Publication date: June 1, 2018

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  • Zeitschrift der Deutschen Gesellschaft für Geowissenschaften (ZDGG) is an international peer reviewed journal that accepts papers on research and applied topics in the Earth Sciences. It is published online and in print. One volume, consisting of four issues is published annually. The journal is continously published by the German Geological Society since its foundation in 1848. It was relaunched in 2005.

    ZDGG invites the submission of English, German and French language papers from all fields of geology, hydrogeology, paleontology, tectonics, sedimentology, engineering geology and of course environmental geology to name a few. The editors of ZDGG also invite suggestions for thematic issues.
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