Heat flow and deep lithospheric thermal structure at Lac de Gras, Slave Province, Canada

J. C. Mareschal; A. Nyblade; H. K.C. Perry; C. Jaupart; G. Bienfait

doi:10.1029/2004GL020133

Heat flow and deep lithospheric thermal structure at Lac de Gras, Slave Province, Canada

J. C. Mareschal, A. Nyblade, H. K.C. Perry, C. Jaupart, G. Bienfait

Geosciences

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Abstract

Temperature measurments in two drill holes near Lac de Gras in the Slave Province of the Canadian Shield yield heat flow values of 43 ± 5 and 48 ± 8 mW m² with an average of 46 ± 6 mW m^-2. Heat production measured on samples from one of these holes is relatively high (1.9 μW m^-3) confirming measurements made on outcrop samples. The surface heat flow and heat generation data imply that below a 10 km thick radioelement enriched layer, heat production is comparable to that in other Archean Provinces of the Canadian Shield. The lithospheric geotherm is very close to the geotherms derived from geothermobarometry on xenoliths. Variations in crustal heat generation account for ≈50K differences in Moho temperatures within the Slave Province.

Original language	English (US)
Pages (from-to)	L12611 1-4
Journal	Geophysical Research Letters
Volume	31
Issue number	12
DOIs	https://doi.org/10.1029/2004GL020133
State	Published - Jun 28 2004

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2004GL020133

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abstract = "Temperature measurments in two drill holes near Lac de Gras in the Slave Province of the Canadian Shield yield heat flow values of 43 ± 5 and 48 ± 8 mW m2 with an average of 46 ± 6 mW m-2. Heat production measured on samples from one of these holes is relatively high (1.9 μW m-3) confirming measurements made on outcrop samples. The surface heat flow and heat generation data imply that below a 10 km thick radioelement enriched layer, heat production is comparable to that in other Archean Provinces of the Canadian Shield. The lithospheric geotherm is very close to the geotherms derived from geothermobarometry on xenoliths. Variations in crustal heat generation account for ≈50K differences in Moho temperatures within the Slave Province.",

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T1 - Heat flow and deep lithospheric thermal structure at Lac de Gras, Slave Province, Canada

AU - Mareschal, J. C.

AU - Nyblade, A.

AU - Perry, H. K.C.

AU - Jaupart, C.

AU - Bienfait, G.

PY - 2004/6/28

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N2 - Temperature measurments in two drill holes near Lac de Gras in the Slave Province of the Canadian Shield yield heat flow values of 43 ± 5 and 48 ± 8 mW m2 with an average of 46 ± 6 mW m-2. Heat production measured on samples from one of these holes is relatively high (1.9 μW m-3) confirming measurements made on outcrop samples. The surface heat flow and heat generation data imply that below a 10 km thick radioelement enriched layer, heat production is comparable to that in other Archean Provinces of the Canadian Shield. The lithospheric geotherm is very close to the geotherms derived from geothermobarometry on xenoliths. Variations in crustal heat generation account for ≈50K differences in Moho temperatures within the Slave Province.

AB - Temperature measurments in two drill holes near Lac de Gras in the Slave Province of the Canadian Shield yield heat flow values of 43 ± 5 and 48 ± 8 mW m2 with an average of 46 ± 6 mW m-2. Heat production measured on samples from one of these holes is relatively high (1.9 μW m-3) confirming measurements made on outcrop samples. The surface heat flow and heat generation data imply that below a 10 km thick radioelement enriched layer, heat production is comparable to that in other Archean Provinces of the Canadian Shield. The lithospheric geotherm is very close to the geotherms derived from geothermobarometry on xenoliths. Variations in crustal heat generation account for ≈50K differences in Moho temperatures within the Slave Province.

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Heat flow and deep lithospheric thermal structure at Lac de Gras, Slave Province, Canada

Abstract

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