Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2707g&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 14, p. 2707-2710
Physics
24
Planetology: Solid Surface Planets: Heat Flow, Tectonophysics: Evolution Of The Earth, Tectonophysics: Heat Generation And Transport, Tectonophysics: Planetary Interiors
Scientific paper
Estimate of mantle heat flow under continental shields are very low, indicating a strong insulating effect of continents on mantle heat loss. This effect is investigated with a simple approach: continents are introduced in an Earth cooling model as perfect thermal insulators. Continental growth rate has then a strong influence on mantle cooling. Various continental growth models are tested and are used to compute the mantle depletion in radioactive elements as a function of continental crust extraction. Results show that the thermal blanketing effect of continents strongly affects mantle cooling, and that mantle depletion must be taken into account in order not to overestimate mantle heat loss. In order to obtain correct oceanic heat flow for present time, continental growth must begin at least 3 Gy ago and steady-state for continental area must be reached for at least 1.5 Gy in our cooling model.
Grigné Cécile
Labrosse Stephane
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