Geo-Marine Letters

, Volume 23, Issue 1, pp 34–42 | Cite as

Paleoenvironment and sea-level change in the early Cretaceous Barents Sea—implications from near-shore marine sapropels

  • Uwe Langrock
  • Ruediger Stein
  • Marcus Lipinski
  • Hans-Jürgen Brumsack
Original

Abstract

The late Volgian (early "Boreal" Berriasian) sapropels of the Hekkingen Formation of the central Barents Sea show total organic carbon (TOC) contents from 3 to 36 wt%. The relationship between TOC content and sedimentation rate (SR), and the high Mo/Al ratios indicate deposition under oxygen-free bottom-water conditions, and suggest that preservation under anoxic conditions has largely contributed to the high accumulation of organic carbon. Hydrogen index values obtained from Rock-Eval pyrolysis are exceptionally high, and the organic matter is characterized by well-preserved type II kerogen. However, the occurrence of spores, freshwater algae, coal fragments, and charred land-plant remains strongly suggests proximity to land. Short-term oscillations, probably reflecting Milankovitch-type cyclicity, are superimposed on the long-term trend of constantly changing depositional conditions during most of the late Volgian. Progressively smaller amounts of terrestrial organic matter and larger amounts of marine organic matter upwards in the core section may have been caused by a continuous sea-level rise.

Notes

Acknowledgements

Financial support by the German Science Foundation (grant STE 412-13/1) is gratefully acknowledged. Sintef Petroleum Research, Norway, kindly provided access to sensitive core material and unpublished data. We thank Dr. Tom Wagner and two anonymous reviewers for their critical comments to improve the manuscript.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Uwe Langrock
    • 1
  • Ruediger Stein
    • 1
  • Marcus Lipinski
    • 2
  • Hans-Jürgen Brumsack
    • 2
  1. 1.Department of GeosciencesAlfred Wegener Institute for Polar and Marine ResearchBremerhavenGermany
  2. 2.Institute for Chemistry and Biology of the Marine Environments (ICBM)Carl von Ossietzky UniversityOldenburgGermany

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