Mathematics – Logic
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..171a&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 2-3, July 1985, p. 171-186.
Mathematics
Logic
14
Continents, Earth Mantle, Geochemistry, Planetary Evolution, Plates (Tectonics), Tectonics, Erosion, Himalayas, Neodymium Isotopes, Subduction (Geology), Volcanoes
Scientific paper
The present model of continental growth combines the results of geochemical studies with tectonic concepts concerning the evolution of continents over geological time. The continental growth process is primarily controlled by surface phenomena, with continental material being extracted from the mantle along subduction zones at the periphery of oceans; it is destroyed in collision zones where it is remobilized and made available for subduction. An equation is derived for the portion of the earth's surface occupied by continents in which two coefficients depend on the geometry of plates, their number, and their velocities. It is assumed that they increase exponentially with time over the same time scale. This model satisfies both geochemical and tectonic constraints, and permits the integration of several current observations in a single framework.
Allègre Claude J.
Jaupart Claude
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