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Martin Gross1, Werner E Piller, Robert Scholger

  • 1Department of Geology & Palaeontology, Universalmuseum Joanneum, Weinzöttlstrasse 16, 8045 Graz, Austria.

Palaeogeography, Palaeoclimatology, Palaeoecology
|February 10, 2012
PubMed
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This study reconstructs the paleoenvironmental evolution of the Styrian Basin using multidisciplinary data. Lake Pannon experienced a transgression, leading to brackish conditions and supporting diverse benthic life over millennia.

Area of Science:

  • Paleoenvironmental reconstruction
  • Stratigraphy
  • Paleontology
  • Geophysics
  • Geochemistry
  • Sedimentology

Background:

  • The Styrian Basin preserves a ~30m thick limnic-deltaic sequence.
  • Understanding paleoenvironmental changes in this region provides insights into Neogene lake dynamics and climate.

Purpose of the Study:

  • To reconstruct the detailed paleoenvironmental evolution of a limnic-deltaic sequence in the Styrian Basin.
  • To analyze both long-term and short-term environmental changes using integrated stratigraphy and high-resolution sampling.

Main Methods:

  • Multidisciplinary approach combining geophysical (gamma ray, rock magnetism), geochemical (organic carbon, sulfur), and sedimentological data.

Related Experiment Videos

  • Palaeontological analysis, primarily focusing on ostracods.
  • Integrated stratigraphy and palaeomagnetic dating to establish Chron C5r.2r-1n (11.308–11.263 Ma).
  • High-resolution sampling (5mm interval) for ostracods and magnetic susceptibility to analyze short-term changes (<3500 yr).

    • Main Results:

    • The ~45 kyr section records the development and extinction of a conifer swamp due to a Lake Pannon transgression.
    • Transgression led to brackish-water conditions (mesohaline), favoring benthic life and greigite formation.
    • High-resolution records reveal centennial-to-decadal fluctuations in bottom-water oxygenation, possibly linked to climate shifts.
    • Lake deepening resulted in faunal turnover and a meromictic system with an oxygen-depleted hypolimnion.
    • Gamma ray-log shows 5-12 kyr cycles potentially related to climatic modulation of precipitation/run-off.

    Conclusions:

    • The study details the paleoenvironmental dynamics of Lake Pannon, including transgression, deepening, and changes in water chemistry and oxygenation.
    • Short-term environmental fluctuations, potentially climate-driven, significantly impacted benthic ecosystems.
    • The limnic-deltaic sequence provides a valuable record of Neogene environmental and climatic variability in the Styrian Basin.