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Earth and Life pp 653-675 | Cite as

Late Ludfordian Correlations and the Lau Event

  • Lennart JeppssonEmail author
  • John A. Talent
  • Ruth Mawson
  • Anita Andrew
  • Carlo Corradini
  • Andrew J. Simpson
  • Jane Wigforss-Lange
  • Hans Peter Schönlaub
Part of the International Year of Planet Earth book series (IYPE)

Abstract

Changes in whole conodont faunas and δ13C values are combined to achieve high-resolution correlations of Upper Silurian successions in many areas (primarily Gotland, Skåne, Lithuania, Bohemia, Austria, Sardinia and Queensland); other areas are correlated with lower precision. Four of the widely recognised subzones average considerably less than 0.1 Ma and a fifth interval less than 0.01 Ma. The main constraints on resolution and precision now achievable are the amount of, and the precision in, new or previously published data from each local section; centimetric scale collecting would be worthwhile in many sections. Some stratal characters are more widespread during certain intervals than might have been expected, for example, the presence of oncolites and algal coatings in the Icriodontid Zone and the lower part of the O. snajdri Zone. Similarly, the Dayia navicula bloom in the Upper P. siluricus Subzone was widespread. So also were muddy-sandy sediments followed by oolite low in the O. snajdri Zone; crinoids flourished widely when the lower part of the Lower Icriodontid Subzone was formed. Closely spaced samples show that, in some intervals, the now well-known δ13C spike was modified considerably by fluctuations; that is, it is not a smooth plateau. The best-documented fluctuations (19 analyses) are 2.5 smooth cycles with up to 2.7‰ in amplitude during ca 12,000 years or less in the base of the O. snajdri Zone. An enigma is the depletion of the spike in some sections, especially in the best Bohemian section.

Keywords

Silurian Mid-Ludfordian Gotland Skåne Bohemia Austria Sardinia Australia Conodonts Lithostratigraphy Chemostratigraphy δ13

Notes

Acknowledgements

Otto Walliser permitted us to use all data from his Cellon collections but declined co-authorship. Antanas Brazauskas very kindly gave access to and generously provided much information on Lithuanian bore cores. Sven Laufeld, Rickard Anehus and Peep Männik assisted LJ during parts of the fieldwork. Git Klintvik Ahlberg processed and picked many of the conodont samples. Fredrik Jerre measured and sampled the section at Bjärsjölagård 2b for scolecodonts and gave the conodonts to LJ. Correspondence with Jiri Kříž and Dim Kaljo helped interpret the Bohemian and Latvian sequences. Nadia Talent assisted in sampling the Botvide section for isotopes; Terry Sloan, the late Ross Talent and Glenn Brock helped sample various Broken River sections. The Swedish Natural Science Council and the Swedish Research Council funded much of LJ’s field and laboratory work, especially conodont extraction, administration, rent for working space and similar university fees. Research grants from the Australian Research Council and Macquarie University to RM and JAT enabled sampling for isotopes at Botvide, and sampling various Broken River sections for conodont and isotope data, as well as funding the isotope analyses and conodont extraction from Australian samples. To all our sincere thanks.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Lennart Jeppsson
    • 1
    Email author
  • John A. Talent
    • 2
  • Ruth Mawson
    • 2
  • Anita Andrew
    • 3
  • Carlo Corradini
    • 4
  • Andrew J. Simpson
    • 5
  • Jane Wigforss-Lange
    • 1
  • Hans Peter Schönlaub
    • 6
  1. 1.Department of GeologyUniversity of LundLundSweden
  2. 2.Earth and Planetary SciencesMacquarie UniversityAustralia
  3. 3.CSIRO Petroleum ExplorationNorth RydeAustralia
  4. 4.Dipartimento di Scienze della TerraUniversità di CagliariCagliariItaly
  5. 5.Department of Earth and Planetary SciencesMuseum Studies and Centre for Ecostratigraphy and Palaeobiology (MUCEP), Macquarie UniversityAustralia
  6. 6.Kötschach-MauthenAustria

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