Archean komatiites and geotherms - Solution to an apparent contradiction

Details Archean komatiites and geotherms - Solution to an apparent contradiction Archean komatiites and geotherms - Solution to an apparent contradiction

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10.1133j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Dec. 1983, p. 1133-1136.

Other

33

Earth Mantle, Geochronology, Geotemperature, Convective Flow, Mathematical Models, Rayleigh Number, Subduction (Geology), Temperature Profiles

Scientific paper

The high liquidus temperatures of Archean komatiites and the low geothermal gradients in Archean continents appear to give contradictory indications of temperatures in the Archean mantle. This contradiction is resolved in terms of an idealized model of convection in the Archean mantle. It is suggested that temperatures in the Archean mantle were no more than 100 C higher than at present, that komatiites originate from the hot lower boundary layer of a nonsteady convection cell, and that Archean continents were formed near subduction zones where near-surface temperature gradients were lower than elsewhere in the convecting mantle.

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