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Journal of the Geological Society; 1999; v. 156; issue.3; p. 527-533;
DOI: 10.1144/gsjgs.156.3.0527
© 1999 Geological Society of London

Article

High-precision 40Ar/39Ar spectrum dating on sanidine from the Donets Basin, Ukraine: evidence for correlation problems in the Upper Carboniferous

JÜRGEN C. HESS1, HANS J. LIPPOLT1 & KURT BURGER2

1 Laboratorium für Geochronologie, Universität Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany (e-mail: hans.lippolt{at}urz.uni-heidelberg.de)
2 Lothringenstr. 8, 45259 Essen, Germany

Two 40Ar/39Ar spectrum measurements on well-preserved volcanic feldspar (sanidine) from the coal tonstein horizon 131 from the lower Kashirsky group (middle Moscovian stage) of the Donets Basin Upper Carboniferous (Ukraine) yielded well-defined plateaus with an average age of 305.5 ± 1.5 Ma. The age is to be interpreted as sedimentation age of the coal tonstein and thus defines a chronostratigraphic time mark in the East European Carboniferous. Taking the correlation of the 131 horizon and the recently published time scales for the Upper Carboniferous as a basis for comparison, the age of 305.5 Ma is about 6 Ma too young. This age discrepancy obviously points to inaccurate or even erroneous correlation, and we therefore are compelled to suggest a reconsideration of the validity of the current biostratigraphic correlation between the Carboniferous of western and East Europe.

Key Words: 40Ar • 39Ar • Donets Basin • Upper Carboniferous • sanidine • correlation




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