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Continental Evolution and Archaeo-Sea-Levels

  • N. J. Vlaar
  • A. P. Van Den Berg
Chapter
Part of the NATO ASI Series book series (ASIC, volume 334)

Abstract

The Archaean geodynamic regime is related to the process of mantle diapirism and creation of oceanic crust and lithosphere. Thick Archaean basaltic crust, by internal instability and convection and repeated melting could produce continental crust, which accumulated into proto-continents.

Large vertical displacements of the Archaean continental crust can be explained in terms of specific isostatic conditions and intensive erosion and deposition due to a falling relative sealevel. Accretion by underplating of new crust from the mantle is accomplished by renewed partial melting of the partially depleted mantle root.

Given that Archaean cratons and their tectosphere have stabilized shortly after their formation, the proposed geodynamic process must have taken place in a relatively short time interval. Corresponding relative sealevel changes amount to a magnitude of the order of kilometers.

Keywords

Oceanic Crust Plate Tectonic Oceanic Lithosphere Basalt Layer Mantle Temperature 
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.

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Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • N. J. Vlaar
    • 1
  • A. P. Van Den Berg
    • 1
  1. 1.Department of Theoretical GeophysicsInstitute of Earth SciencesUtrechtThe Netherlands

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