Oceanic heat flow measurements over the continental margins of eastern Canada

10.4095/75968 ◽  
1976 ◽  
Author(s):  
J F Lewis ◽  
R D Hyndman
Keyword(s):  
Heat Flow ◽  
Continental Margins ◽  
Eastern Canada ◽  
Flow Measurements

Oceanic heat flow measurements over the continental margins of eastern Canada

1976 ◽  
Vol 13 (8) ◽  
pp. 1031-1038 ◽  
Author(s):  
J. F. Lewis ◽  
R. D. Hyndman
Keyword(s):  
Nova Scotia ◽  
Heat Flow ◽  
Numerical Models ◽  
Continental Margins ◽  
Eastern Canada ◽  
Flow Measurements ◽  
Grand Banks ◽  
The Mean ◽  
Seismic Reflection Profiles ◽  
Heat Flow Variations

Sixteen heat flow measurements have been obtained on the continental rise and slope off Nova Scotia and off the southern Grand Banks of Newfoundland. The mean of the 14 most reliable values is 48 ± 4 mW m−2 (1.15 ± 0.09 μcal cm−2 s−1), which is in agreement with the mean for previous measurements on ocean floor of age greater than 100 m.y. However, the heat flux from the crust indicated by the new values is significantly lower because of the heat produced in the some 5 km of terrigenous sediments underlying the stations. The low values could represent an edge effect between continent and ocean. Two lines of stations across the Nova Scotia rise show large heat flow variations. Numerical models indicate that the variations could arise from thermal refraction by high thermal conductivity salt, which probably constitutes the 'sedimentary ridge complex' outlined by deep seismic reflection profiles. The salt or evaporites formed in the restricted basin that was parallel to this rifted margin during the first phase of opening of the Atlantic Ocean. The heat flow variations measured on a profile perpendicular to the southern edge of the Grand Banks are smaller. This margin was a transform fault between Newfoundland and northwest Africa during the early ocean opening, so that the seafloor in the region of the profile was produced after the restricted basin phase of evaporite formation.

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.

The thermal structure of the central Nova Scotia Slope (eastern Canada): seafloor heat flow and thermal maturation models

2017 ◽  
Vol 54 (2) ◽  
pp. 146-162 ◽  
Author(s):  
Eric Negulic ◽  
Keith E. Louden
Keyword(s):  
Heat Flow ◽  
Thermal Structure ◽  
Conductive Heat ◽  
Borehole Data ◽  
Eastern Canada ◽  
Flow Measurements ◽  
Seismic Reflection Data ◽  
Radiogenic Heat ◽  
Reflection Data ◽  
Hydrocarbon Maturation

The thermal history and maturation potential of the central Scotian Slope is constrained using a combination of 47 recently acquired seafloor heat flow measurements, two-dimensional (2D) seismic reflection data, available well data, simple lithospheric rift models, and thermal and petroleum systems modelling. Consistent heat flow values of 41–46 mW·m−2 were measured seaward of the salt diapiric province and across the slope away from the influence of salt structures. Significant but highly variable increases in heat flow were measured for stations overlying salt diapiric structures, reaching values upwards of 72 mW·m−2. Simple models of conductive heat transfer with static salt geometries constrained from reflection profiles indicate that two of the four models fit the data, whereas two indicate much higher values suggestive of additional, convective effects. Dynamic 2D thermal models were developed to incorporate the effects of lithospheric rifting, crustal stretching, and radiogenic heat production in the sediment and basement. These models help constrain the hydrocarbon maturation potential of the central Scotian Slope, where deep borehole data are lacking. Our results suggest that a potential Late Jurassic source rock interval rests primarily within the late oil window and that salt structures act primarily to reduce maturation in the adjacent deep sediment layers.

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

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.

New terrestrial heat flow measurements on the Nazca Plate

1976 ◽  
Vol 29 (2) ◽  
pp. 243-254 ◽  
Author(s):  
Roger N. Anderson ◽  
Marcus G. Langseth ◽  
Victor Vacquier ◽  
Jean Francheteau
Keyword(s):  
Heat Flow ◽  
Flow Measurements ◽  
Nazca Plate ◽  
Terrestrial Heat Flow

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.

Heat flow measurements in the southern portion of the Gulf of California

1973 ◽  
Vol 19 (2) ◽  
pp. 198-208 ◽  
Author(s):  
Lawrence A. Lawver ◽  
John G. Sclater ◽  
Thomas L. Henyey ◽  
J. Rogers
Keyword(s):  
Heat Flow ◽  
Gulf Of California ◽  
Flow Measurements
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