Heat flow measurements under some lakes in the Superior Province of the Canadian Shield: Discussion

1980 ◽  
Vol 17 (8) ◽  
pp. 1108-1110 ◽  
Author(s):  
A. E. Beck
Keyword(s):  
Heat Flow ◽  
Canadian Shield ◽  
Superior Province ◽  
Flow Measurements

Some new measurements of heat flow in the Superior Province of the Canadian Shield

1987 ◽  
Vol 24 (7) ◽  
pp. 1486-1489 ◽  
Author(s):  
Malcolm Drury ◽  
Alan Taylor
Keyword(s):  
Standard Deviation ◽  
Heat Flow ◽  
Canadian Shield ◽  
Superior Province ◽  
Flow Measurements ◽  
Radiogenic Heat ◽  
Radiogenic Heat Production ◽  
Climatic Variations ◽  
The Mean ◽  
A Site

Borehole heat-flow measurements are reported from six new sites in the Superior Province of the Canadian Shield. Values adjusted for glaciation effects, but not for Holocene climatic variations, range from 42 to 56 mW/m2. When these new values are combined with 21 previously published borehole values the mean is 42 mW/m2 with a standard deviation of 11 mW/m2. The data for a site on the Lac du Bonnet batholith suggest that the batholith has a thin veneer, less than 3 km, of rock of high radiogenic heat production at the surface.

Thermal regime of the lithosphere in the Canadian ShieldThis article is one of a series of papers published in this Special Issue on the theme Lithoprobe — parameters, processes, and the evolution of a continent.

2010 ◽  
Vol 47 (4) ◽  
pp. 389-408 ◽  
Author(s):  
Claire Perry ◽  
Carmen Rosieanu ◽  
Jean-Claude Mareschal ◽  
Claude Jaupart
Keyword(s):  
Heat Flow ◽  
Heat Generation ◽  
Seismic Refraction ◽  
Surface Heat ◽  
Canadian Shield ◽  
P Wave ◽  
Seismic Velocities ◽  
Flow Measurements ◽  
Surface Heat Flow ◽  
Mantle Heat Flow

Geothermal studies were conducted within the framework of Lithoprobe to systematically document variations of heat flow and surface heat production in the major geological provinces of the Canadian Shield. One of the main conclusions is that in the Shield the variations in surface heat flow are dominated by the crustal heat generation. Horizontal variations in mantle heat flow are too small to be resolved by heat flow measurements. Different methods constrain the mantle heat flow to be in the range of 12–18 mW·m–2. Most of the heat flow anomalies (high and low) are due to variations in crustal composition and structure. The vertical distribution of radioelements is characterized by a differentiation index (DI) that measures the ratio of the surface to the average crustal heat generation in a province. Determination of mantle temperatures requires the knowledge of both the surface heat flow and DI. Mantle temperatures increase with an increase in surface heat flow but decrease with an increase in DI. Stabilization of the crust is achieved by crustal differentiation that results in decreasing temperatures in the lower crust. Present mantle temperatures inferred from xenolith studies and variations in mantle seismic P-wave velocity (Pn) from seismic refraction surveys are consistent with geotherms calculated from heat flow. These results emphasize that deep lithospheric temperatures do not always increase with an increase in the surface heat flow. The dense data coverage that has been achieved in the Canadian Shield allows some discrimination between temperature and composition effects on seismic velocities in the lithospheric mantle.

Three measurements of heat flow in Eastern Canada

1968 ◽  
Vol 5 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Alan M. Jessop
Keyword(s):  
Heat Flow ◽  
Superior Province ◽  
Geochemical Analysis ◽  
Eastern Canada ◽  
Flow Measurements ◽  
Grenville Province ◽  
World Average ◽  
Average Value ◽  
The World

Heat flow measurements, with appropriate corrections for the effects of Wisconsin glaciation, from three widely separated locations in eastern Canada are reported. One value in the Grenville rocks of Ontario agrees with earlier published values, but, when corrected for the effects of glaciation, becomes close to the world average value. The heat flow found in the New Quebec part of the Superior Province is significantly lower than is found in the Grenville Province. This can be explained by a hypothesis based on geochemical analysis of the surface rocks.

scholarly journals Heat flow in the western Superior Province of the Canadian shield

2003 ◽  
Vol 30 (12) ◽  
Author(s):  
F. Rolandone ◽  
J. C. Mareschal ◽  
C. Jaupart ◽  
C. Gosselin ◽  
G. Bienfait ◽  
...  
Keyword(s):  
Heat Flow ◽  
Canadian Shield ◽  
Superior Province

Systematic heat flow measurements across the Wagner Basin, northern Gulf of California

2017 ◽  
Vol 479 ◽  
pp. 340-353 ◽  
Author(s):  
Florian Neumann ◽  
Raquel Negrete-Aranda ◽  
Robert N. Harris ◽  
Juan Contreras ◽  
John G. Sclater ◽  
...  
Keyword(s):  
Heat Flow ◽  
Gulf Of California ◽  
Flow Measurements
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