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TitleThermal regimes and diamond stability in the Archean Slave Province, northwestern Canadian Shield, District of Mackenzie, Northwest Territories
DownloadFree download (whole publication) (pdf 76004 KB)
AuthorThompson, P H; Judge, A S; Charbonneau, B W; Carson, J M; Thomas, M D
SourceCurrent Research/Recherches en cours; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1996-E, 1996 p. 135-146, https://doi.org/10.4095/207882
Year1996
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (1996). Current Research, Geological Survey of Canada, Current Research no. 1996-E
ProvinceNorthwest Territories
NTS75L; 75M; 85I; 85J; 85O; 85P; 76D; 76E; 86A; 86B; 86G; 86H
AreaCanadian Shield; Contwoyto Lake; Winter Lake; Lac de Gras; Yamba Lake; Mackay Lake; Yellowknife; Gordon Lake; Cross Lake
Lat/Long WENS-113.0000 -111.0000 65.0000 64.0000
Subjectsigneous and metamorphic petrology; geophysics; thermal regimes; radiogenic heat; diamond; phase equilibria; heat flow; geothermal gradient; gravity anomalies; geophysical surveys; modelling; kimberlites; lithology; plutonic rocks; granites; granodiorites; tonalites; diorites; igneous rocks; metavolcanic rocks; metasedimentary rocks; gneisses; migmatites; metamorphic rocks; Archean; Slave Province; Yellowknife Supergroup; Precambrian; Proterozoic
Illustrationssketch maps; gravity models; analyses
Released1996 08 01
AbstractThe combination of apparent heat production values derived from airborne radiometric surveys with outcrop and laboratory measurements, for the area bounded by 62°-66°N and 110°-116°W, indicates an arcuate zone (>30000 km2) with average heat production in excess of 2.5 µW/m3 and anomalies tens of kilometres across that exceed 5.0 µW/m3.
One-dimensional numerical models indicate that a lateral increase in average heat production in the upper crust from 1.7 µW/m3 (surface heat flow = 40 mW/m2) to 3.0 µW/m3 (surface heat flow = 50 mW/m2) corresponds to a reduction in lithospheric thickness from 215 to 180 km and in the thickness of the potentially diamondiferous zone in the lowermost lithosphere from 85 to 30 km.
According to a limited data set, kimberlite pipes close to or within heat production anomalies (Cross Lake, Yamba Lake) are significantly less diamondiferous than those near Lac de Gras. While many other factors may be involved, the significance of crustal heat production with respect to diamond potential merits careful consideration.
GEOSCAN ID207882