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TitleThermal parameters in rock units of the Winter Lake-Lac de Gras area, central Slave Province, Northwest Territories - implications for diamond genesis
DownloadFree download (whole publication) (pdf 82431 KB)
AuthorThompson, P H; Judge, A S; Lewis, T J
SourceCurrent research 1995-E/Recherches en cours 1995-E; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-E, 1995 p. 125-135, https://doi.org/10.4095/205196
Year1995
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (1995). Current research 1995-E, Geological Survey of Canada, Current Research no. 1995-E
ProvinceNorthwest Territories
NTS76D/03; 76D/04; 76D/05; 76D/06; 76D/11; 76D/12; 76D/13; 76D/14; 86A/01; 86A/02; 86A/07; 86A/08; 86A/09; 86A/10; 86A/15; 86A/16
AreaWinter Lake; Lac de Gras
Lat/Long WENS-113.0000 -111.0000 65.0000 64.0000
Subjectsigneous and metamorphic petrology; radiogenic heat; lithology; amphibolites; gneisses; metamorphic rocks; granites; igneous rocks; plutonic rocks; thermal conductivity; diamond; modelling; petrogenesis; Slave Province; Precambrian
Illustrationssketch maps; analyses; models
ProgramSlave Province NATMAP Project
Released1995 07 01
AbstractRadiogenic heat production varies with rock type from 0.1-0.8 þW/m3 in amphibolite and tonalitic gneiss to 8.0-15.8 þW/m3 in late granites. Metasedimentary rocks and other granitoid units fall between these extremes. Thermal conductivity ranges from 2.3 to 4.9 W/múK. Conductivity parallel to planar foliation or layering is up to 1.6 times higher than that perpendicular to these features.
A simple conductive thermal model and the assumption that the lithosphere/asthenosphere boundary is a thermal feature (1300°C) suggests that decreasing heat production in the crust can account for the transition from barren lithosphere less than 100 km thick at the end of the Archean to a diamond-bearing lithosphere 200-225 km thick today. Lateral variations in this parameter may cause the thickness of diamond-bearing lithosphere beneath the Slave Province to change.
Consistency between the model results, surface geology, and the results of other modelling approaches suggests that crustal thermal parameters and their evolution with time should be part of any comprehensive hypothesis for formation and evolution of lithosphere beneath Archean cratons.
GEOSCAN ID205196