Continental geotherms during the Archaean

Details Continental geotherms during the Archaean Continental geotherms during the Archaean

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.277..556e&link_type=abstract

Nature, vol. 277, Feb. 15, 1979, p. 556-558.

Other

4

Earth Crust, Geothermal Resources, Paleontology, Precambrian Period, Temperature Gradients, Earth Planetary Structure, Long Term Effects, Pressure Effects, Tectonics

Scientific paper

It is found that P-T data from high grade Archaean terrains represent temperatures reached during the exhumation of the rocks from an overthick crust and are probably not lower than equilibrium profiles for this thickened crust. At present the best upper limit which may be placed on the heat flow from the Archaean mantle from these data is 2-3 times present-day subcontinental values, and in this respect the P-T data offer no improvement in constraints of Archaean geothermal regimes over those from general observations of continental integrity in the Archaean. It would be possible to lower the upper bound on Archaean continental geothermal gradients if reliable information were obtained on the distribution of heat-producing elements in the Archaean crust and on the P-T-time paths followed during the exhumation of high grade Archaean rocks.

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