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Mikael Calner

Mikael Calner

Professor

Mikael Calner

A new upper Middle Ordovician-Lower Silurian drillcore standard succession from Borenshult in Ostergotland, southern Sweden: 2. Significance of delta C-13 chemostratigraphy

Författare

  • Stig M. Bergstroem
  • Oliver Lehnert
  • Mikael Calner
  • Michael M. Joachimski

Summary, in English

A total of 239 isotope samples are used for establishing the delta C-13 chemostratigraphy in the upper Middle Ordovician to Lower Silurian succession in the approximately 70 m long Borenshult drillcore. The study interval starts in the upper Darriwilian Furudal Limestone and ends in the Rhuddanian Motala Formation. Four named delta C-13 excursions are recognized in 3-4 formations, namely the Guttenberg isotope carbon excursion (GICE) in the lower-middle Freberga Formation, the Kope (Rakvere) excursion in the uppermost Freberga Formation and possibly the Slandrom Formation, the Whitewater (Moe) excursion in the Lower Member of the Jonstorp Formation and the Hirnantian isotope carbon excursion (HICE) in the Loka Formation. The Middle Darriwilian isotope carbon excursion (MDICE) is missing in the drillcore and it is suggested that the study succession starts just above the interval of this excursion, which is in agreement with the range of MDICE in other Baltoscandic successions. The widespread Waynesville (Saunja) excursion may be cut out by the prominent unconformity below the Fjacka Shale. The two most conspicuous excursions are the GICE (peak value similar to+1.9 parts per thousand) and the HICE (peak value similar to+3.7 parts per thousand), whereas the other excursions are represented by relatively minor perturbations in the delta C-13 curve. The Borenshult drillcore chemostratigraphy, which has been closely tied to conodont biostratigraphy, is quite similar to that of Estonian drillcores and is useful for not only trans-Baltic but also trans-Atlantic correlations. It is the first drillcore-based delta C-13 chemostratigraphy from the Swedish Ordovician.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2012

Språk

Engelska

Sidor

39-63

Publikation/Tidskrift/Serie

GFF

Volym

134

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Geology

Nyckelord

  • Middle and Upper Ordovician
  • delta C-13 chemostratigraphy
  • regional
  • correlation
  • Hirnantian excursion
  • Guttenberg excursion
  • Borenshult
  • fauna

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2000-0863