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Facies

, Volume 56, Issue 1, pp 157–172 | Cite as

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

  • Mikael CalnerEmail author
  • Oliver Lehnert
  • Michael Joachimski
Original Article

Abstract

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 (Skålberg Limestone) belonging to the Amorphognathus superbus Zone. New stable isotope data from the Amtjärn quarry shows that this is immediately after the peak of the Guttenberg Carbon Isotope Excursion (GICE), which reaches a δ13C peak value at 3.3‰ 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.

Keywords

GICE Conglomerates Black shale Glaciation Katian Siljan district Sweden 

Notes

Acknowledgments

We are grateful to Stig M. Bergström, Jan-Ove Ebbestad and Åsa Frisk for many interesting discussions on the Upper Ordovician stratigraphy of Sweden. Valuable comments from the reviewers Stig M. Bergström and Patrick McLaughlin further improved the manuscript. MC acknowledges the Swedish Research Council (VR) for support over many years and Crafoord for a grant to recover the Borenshult-1 drillcore. OL and MJ are grateful to the support by the Deutsche Forschungsgemeinschaft (DFG grant to W. Buggisch, Bu 312/59).

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Mikael Calner
    • 1
    Email author
  • Oliver Lehnert
    • 2
  • Michael Joachimski
    • 2
  1. 1.GeoBiosphere Science CentreLund UniversityLundSweden
  2. 2.GeoCenter Northern BavariaUniversity of Erlangen-NürnbergErlangenGermany

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