Other
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2031j&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2031-2034.
Other
8
Anomalous Temperature Zones, Cratons, Heat Flux, Structural Properties (Geology), Earth Crust, Earth Mantle, Geothermal Anomalies
Scientific paper
Heat flow studies in southern Africa reveal a pattern of low heat flow in Archean cratons compared with Proterozoic mobile belts that provides grounds for modeling in which cratons have lower mantle heat flux and greater lithospheric thickness. Measurements at nine locations in a 90-km-long north-south traverse show an increase of heat flow from typically cratonic values of about 45 mW/sq m in the north to about 80 mW/sq m where the craton abuts on the Natal belt in the south. The change occurs within 30 km, suggesting that the anomaly largely reflects an increase in radioactive heat from the upper crust in the orogenic front. The change in mantle heat flux across the boundary is probably considerably smaller. These and other results suggest that the surficial craton boundary is further north than usually depicted.
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