| Title | Thermal parameters in rock units of the Winter Lake-Lac de Gras area, central Slave Province, Northwest Territories - implications for diamond genesis |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Thompson, P H; Judge, A S; Lewis, T J |
| Source | Current 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  Open Access |
| Year | 1995 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This publication is contained in Current research 1995-E
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| File format | pdf |
| Province | Northwest Territories |
| NTS | 76D/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 |
| Area | Winter Lake; Lac de Gras |
| Lat/Long WENS | -113.0000 -111.0000 65.0000 64.0000 |
| Subjects | igneous and metamorphic petrology; radiogenic heat; lithology; amphibolites; gneisses; metamorphic rocks; granites; igneous rocks; plutonic rocks; thermal conductivity; diamond; modelling; petrogenesis;
Slave Province; Precambrian |
| Illustrations | sketch maps; analyses; models |
| Program | Slave Province NATMAP Project |
| Released | 1995 07 01 |
| Abstract | Radiogenic 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 ID | 205196 |
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