Continental volume and freeboard through geological time

Details Continental volume and freeboard through geological time Continental volume and freeboard through geological time

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..336s&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, July 25, 1985, p. 336-339.

Computer Science

26

Continental Drift, Cratons, Earth Crust, Earth Movements, Geochronology, Ocean Dynamics, Earth Mantle, Earth Surface, Isostasy

Scientific paper

The consequences of approximately constant freeboard for continental growth are explored using a model that relates the volumes of isostatically compensated continents and oceans to the secular decline in terrestrial heat flow. It is found that a post-Archean increase in freeboard by 200 m requires continental growth of only 10 percent, while a decrease in freeboard by 200 m during this same period necessitates a crustal growth of 40 percent. Shrinkage of the continental crust since the end of the Archean can be ruled out. Changes of more than 10 percent in post-Archean crustal thickness are highly unlikely.

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