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A chronology of Paleozoic sea-level changes
Bilal U Haq1, Stephen R Schutter
1National Science Foundation, Arlington, VA 22230, USA. bhaq@nsf.gov
Science (New York, N.Y.)
|October 4, 2008
Summary
This study reconstructs Paleozoic Era sea levels, revealing long-term trends and 172 eustatic events. Sea level fluctuated significantly, with magnitudes up to 125 meters, impacted by events like the Hirnantian glaciation.
Area of Science:
- Paleontology
- Stratigraphy
- Paleoceanography
Background:
- Paleozoic Era sea-level history remains incompletely integrated.
- Previous studies focused on specific periods, lacking a comprehensive overview.
- Understanding past sea-level changes is crucial for paleoclimate and tectonic reconstructions.
Purpose of the Study:
- To reconstruct a comprehensive history of sea-level fluctuations throughout the entire Paleozoic Era.
- To identify and document individual eustatic events and their magnitudes.
- To analyze long-term sea-level trends and their drivers.
Main Methods:
- Utilized stratigraphic sections from pericratonic and cratonic basins.
- Evaluated timing and amplitude of individual sea-level events.
- Integrated data to establish a unified sea-level curve for the Paleozoic.
Main Results:
- Documented 172 eustatic events across the Paleozoic.
- Identified a long-term sea-level rise through the Cambrian to a Late Ordovician zenith.
- Observed significant sea-level fluctuations, including a withdrawal during Hirnantian glaciation and subsequent highs and lows.
- Magnitudes of sea-level change varied from tens of meters to approximately 125 meters.
Conclusions:
- A detailed sea-level history for the Paleozoic Era has been established.
- Sea-level fluctuations were dynamic, influenced by glaciations and tectonic activity.
- Accurate estimation of sea-level change magnitude remains a challenge.
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