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Calner at Rödvig

Mikael Calner

Professor

Calner at Rödvig

Carbonate mud mounds, conglomerates, and sea-level history in the Katian (Upper Ordovician) of central Sweden

Author

  • Mikael Calner
  • Oliver Lehnert
  • Michael Joachimski

Summary, in English

The Katian (Upper Ordovician) facies succession of the Siljan district, central Sweden, records some of the most prominent environmental changes in the Ordovician of Baltoscandia. These changes include two separate phases of major sea-level drawdown that were of basinwide and presumably global importance. The first regression and lowstand terminated an entire generation of carbonate mud mounds (the Kullsberg Limestone) and resulted in the formation of polymict carbonate conglomerates (SkAyenlberg Limestone) belonging to the Amorphognathus superbus Zone. New stable isotope data from the Amtjarn quarry shows that this is immediately after the peak of the Guttenberg Carbon Isotope Excursion (GICE), which reaches a delta C-13 peak value at 3.3aEuro degrees in the uppermost Amorphognathus tvaerensis Conodont Zone. A second major regression and sea-level lowstand is manifested by palaeokarst morphologies in the Slandrom Limestone, which formed close in time to the comparably minor Waynesville positive carbon excursion in the basal Amorphognathus ordovicicus Conodont Zone. The widespread exposure associated with this latter lowstand terminated carbonate production in much of the basin, and, during the subsequent flooding, organic-rich, graptolitic shale formed across most of Baltoscandia. The two corresponding sequence boundaries are amalgamated at the top of truncated carbonate mud mounds in the Siljan district, resulting in a pronounced Middle Katian hiatus in the immediate mound areas.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2010

Language

English

Pages

157-172

Publication/Series

Facies

Volume

56

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Geology

Keywords

  • Sweden
  • Siljan district
  • Katian
  • Glaciation
  • Black shale
  • GICE
  • Conglomerates

Status

Published

ISBN/ISSN/Other

  • ISSN: 0172-9179