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Geological Society, London, Special Publications; 2002; v. 201; p. 115-131;
DOI: 10.1144/GSL.SP.2002.201.01.06
© 2002 Geological Society of London

Biostratigraphic/Provenance Evidence

Chitinozoa and Nd isotope stratigraphy of the Ordovician rocks in the Ebbe Anticline, NW Germany

J. Samuelsson1,2,3, A. Gerdes4, L. Koch5, T. Servais6 & J. Verniers1

1 Research Unit Palaeontology, Department of Geology and Pedology, Ghent University, Krijgslaan 281 / S 8, B-9000 Ghent, Belgium
2 Géosciences-Rennes, UMR 6118 du CNRS, Université de Rennes I, F-350 42 Rennescedex, France
3 Institute of Earth Sciences, Historical Geology and Palaeontology, Norbyvägen 22, S-754 36 Uppsala, Sweden joakim.samuelsson{at}geo.uu.se
4 NERC Isotope Geoscience Laboratory, Kingsley Dunham Centre, Keyworth, Notts NG 12 5GG, UK
5 Heinrich-Heine-Straße 5, D-58256 Ennepetal, Germany
6 USTL, UPRESA 8014 du CNRS, Bât. SN5, F-59655 Villeneuve d’Ascq Cedex, France

Strongly tectonized Ordovician rocks appear in the Ebbe Anticline (Rheinisches Schiefergebirge), West Germany. These fine-grained detrital rocks of the Herscheider Schichten are divided into the Plettenberger Bänderschiefer. Unterer (Kiesberter) Tonschiefer, (Rahlenberger) Grauwackenschiefer, and the Oberer (Solinger) Tonschiefer. The scope of this investigation was to improve the dating of the entire Ordovician succession. but especially the Oberer (Solinger) Tonschiefer. We used chitinozoans. Palaeozoic microfossils of high biostratigraphic value, and Nd isotopes, which previously have been used for correlation and terrane affinity analysis. Chitinozoan preservation is poor, but some taxa could be confidentially identified to the species level. The {varepsilon}Nd(t) values obtained from the Ordovician succession range from -8.0 to -9.2. Joint evaluation of chitinozoan and Nd isotope data together with previously known age-ranges suggest the following ages for the Herscheider Schichten: Plettenberger Bänderschiefer (early Abereiddian, earliest Llanvirn), Unterer (Kiesberter) Tonschiefer (early to mid Abereiddian, early Llanvirn). (Rahlenberger) Grauwackenschiefer (Aurelucian, earliest Caradoc), and Oberer (Solinger) Tonschiefer (late Caradoc). The Ebbe {varepsilon}Nd(t) values are most readily compared with {varepsilon}Nd(t) values from Avalonia. and we therefore support the inclusion of the Ordovician rocks of the Ebbe Anticline in that palaeocontinent.





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