Archean oceanic flake tectonics

Details Archean oceanic flake tectonics Archean oceanic flake tectonics

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1077h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Sept. 1988, p. 1077-1080.

Mathematics

Logic

39

Earth Crust, Lithosphere, Ocean Bottom, Planetary Evolution, Tectonics, Delaminating, Earth Mantle, Flakes, Geotemperature, Rheology

Scientific paper

Assuming that the Archean mantle was hotter and the oceanic crust thicker than at present, it is estimated that the Archean oceanic lithosphere had a 'sandwich' rheology, with the lower crust behaving as a soft, ductile layer. Accordingly, the Archean oceanic lithosphere had a rheological structure similar to present-day continental lithosphere but unlike present-day oceanic lithosphere. The thickness of the ductile layer is a decreasing function of age, while its strength is an increasing function of age. The buoyancy problem in Archean subduction could be overcome by delamination of oceanic upper crust, but mass balance calculation indicates that most Archean oceanic crust must have been recycled. Where the right dynamic conditions existed for delamination, oceanic flake tectonics may have been an important process leading to the preservation of oceanic upper crust in 'greenstone belts' that are characteristic of Archean terrains.

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