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Geotectonics

  • Gerrit Lohmann
  • Klaus Grosfeld
  • Dieter Wolf-Gladrow
  • Anna Wegner
  • Justus Notholt
  • Vikram Unnithan
Chapter
Part of the SpringerBriefs in Earth System Sciences book series (BRIEFSEARTHSYST)

Abstract

Geophysical data acquired along the Antarctic passive margins constrain the structure and geometry of the deformed continental crust. Crustal thickness estimates range between 7 and 50 km and the Antarctic continent–ocean transition zone (COTZ) extends up to 100–670 km towards the ocean. Continental deformation prior to rifting over a c. 100 million years long time span resulted in crustal stretching factors varying between 1.8 and 5.9. The time span of deformation was sufficiently large and the rifting velocity low enough to extend the margin by up to 300–400 km. Crustal thinning generates a significant subsidence and shallow water passages might already have developed during the rifting phase along the margin. Accounting for accurate continental margin deformation has also consequences for plate-tectonic reconstructions.

Keywords

Oceanic Crust Magnetic Anomaly Crustal Thickness Spreading Ridge Passive Continental Margin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Many thanks go to the editors, and an anonymous reviewer, whose comments helped to improve the publication.

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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • Gerrit Lohmann
    • 1
  • Klaus Grosfeld
    • 1
  • Dieter Wolf-Gladrow
    • 1
  • Anna Wegner
    • 1
  • Justus Notholt
    • 2
  • Vikram Unnithan
    • 3
  1. 1.Alfred-Wegener-Institut für Polar und MeeresforschungBremerhavenGermany
  2. 2.Institut für Umweltwissenschaften Universität BremenBremenGermany
  3. 3.Earth and Space Science School of Engineering and ScienceJacobs University gGmbHBremenGermany

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