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Long-term sea-level fluctuations driven by ocean basin dynamics.

R Dietmar Müller1, Maria Sdrolias, Carmen Gaina

  • 1EarthByte Group, School of Geosciences, Building H11, University of Sydney, Sydney, NSW 2006, Australia. dietmar@geosci.usyd.edu.au

Science (New York, N.Y.)
|March 8, 2008
PubMed
Summary
This summary is machine-generated.

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Late Cretaceous sea level was much higher than previously thought, reaching 170 meters above present levels. This revised understanding reconciles geological data with ocean basin reconstructions, explaining discrepancies in past sea-level estimates.

Area of Science:

  • Geology
  • Paleoceanography
  • Geophysics

Background:

  • Late Cretaceous sea-level estimates vary widely, from 40 to 250 meters above present levels.
  • Discrepancies exist between estimates based on continental margins (e.g., New Jersey) and ocean basin reconstructions.

Purpose of the Study:

  • To model a more accurate Late Cretaceous sea level.
  • To reconcile differing sea-level estimates.
  • To investigate mechanisms causing subsidence on continental margins.

Main Methods:

  • Assimilating marine geophysical data into ancient ocean basin reconstructions.
  • Utilizing a mantle convection model to assess tectonic subsidence.
  • Comparing modeled sea levels with geological evidence.

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Main Results:

  • Modeled Late Cretaceous sea level at 170 meters (85 to 270 meters) above present.
  • Identified significant subsidence (105 to 180 meters) in the New Jersey region over 70 million years.
  • Attributed subsidence to North America's movement over the subducted Farallon plate.

Conclusions:

  • The study provides a reconciled estimate for Late Cretaceous sea level.
  • Tectonic subsidence is a key factor in explaining discrepancies in margin-based sea-level data.
  • Mantle dynamics and plate tectonics significantly influence long-term sea-level records.