References
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Heat-flow patterns of the North American continent; A discussion of the Geothermal Map of North America
The objective in creating a Geothermal Map of North America (Blackwell and Steele, 1991) was to show as accurately and completely as possible the state of knowledge of the geothermal field of the continent in all its variations. As a consequence, the types of information shown are combined in a way that is different from existing maps. The only other continent-wide map representations of aspects of temperature, geothermal gradient, or heat-flow data are the AAPG/USGS Subsurface Temperature Map of North America (1976b) and the Geothermal Gradient Map of North America (1976a) both at a 1:5,000,000 scale.Geothermal gradient maps of the …
High Heat-Flow Anomaly around Hatsushima Biological Community in the Western Sagami Bay, Japan
Heat flow values have been determined at sites that are densely distributed around biological communities located along a topographic inflection line to the southeast of Hatsushima Island in the western Sagami Bay through four research cruises since 1988. Anomalously high heat flow values up to 2,000 mW/m2 were observed at the largest community, where a high methane content anomaly had been found indicating fluid venting activity. Within 1 km of the inflection line, which is presumed to be a surface expression of an active fault, heat flow values are high and variable (about 400 mW/m2), whereas they are low and …
Thermal State of the Queen Charlotte Basin, British Columbia: Warm
Catalogue of Heat Flow Density Data: Portugal
Mesures et interprétations géothermiques sur trois sites GPF
Catalogue of Heat Flow Density Data: Spain
Variations in Heat-Flow across the Goban Spur and Galicia Bank Continental Margins
We present the results of 44 new heat flow stations which were taken in 1984 and 1989 in profiles across the Goban Spur and Galicia Bank continental margins (NW Atlantic Ocean). Simple extensional models indicate that the heat flow across both these Early Cretaceous rifted margins should increase from values of 45-50 mW/m2 over oceanic crust to 65-80 mW/m2 on the continents. The rate of this increase should help to constrain the mechanism (simple versus pure shear) by which the upper, more radiogenic continental crust is thinned. Measurements across Goban Spur increase from values of 40-45 mW/m2 over oceanic crust …
Compilation of Heat Flow Data in Southeast Asia and Its Marginal Seas
A new compilation of heat flow data in Southeast Asia has been attempted using published data as of 1988, as well as unpublished data. The latter was obtained by combining published temperature gradient data of hydrocarbon exploratory wells with average thermal conductivity for individual basins estimated from published data. A microcomputer was used for editing and displaying heat flow data quickly. The final, compiled map showing grid average heat flow values is presented together with some discussions on its large-scale geophysical implications.
Heat flux in the Canadian Cordillera
The rugged Canadian Cordillera has been and is being created by various dynamic processes that are dominated by past and present plate-tectonic motions and interactions. A summary of the tectonic models proposed for the Cordillera, together with the geologic record and geophysical data that support them, is given by Gabrielse and Yorath (DNAG volume: Geology of Canada Series: Cordilleran Orogen, Canada, in preparation). In this active area the heat flux is determined by various regimes and processes, and the reduced heat flow is a diagnostic indicator of the state of the lithosphere. In general, the heat flux is decreased by …
Geothermal study in the Leizhou panisulase China (in Chinese)
Catalogue of Heat Flow Density Data: Greece
Heat flow, hydrothermal circulation and basalt intrusions in the Guaymas Basin, Gulf of California
The Guaymas Basin is part of an en echelon series of short, seafloor-spreading segments in the Gulf of California. The basin is separated from adjacent deeps by long, northwest-southeast-striking transform faults, and divided into subparallel, northern and southern troughs which trend northeast to southwest. Rapid sedimentation (1 to 5 m ka-1) results in a striking morphological contrast between seafloor spreading in the Guaymas Basin and that in more mature, mid-ocean settings. Basalt does not extrude onto the seafloor in the basin as flows and pillows, but instead intrudes into a thick sediment layer. The presence of relatively unconsolidated sediments lining …
Terrestrial Heat-Flow in Cuba
The results of two joint expeditions to Cuba to measure terrestrial heat flow in 1983 and 1986 are summarized. Twenty-three new values are presented, which confirm the low heat flow in practically all of the island. The mean and standard deviation (44.7 +/- 13.4 mW m-2) agree well with previous observations.
Catalogue of Heat Flow Density Data: Czechoslovakia
Catalogue of Heat Flow Density Data: Iceland
Terrestrial heat flow in Canada
The first heat-flow data in Canada were published in 1951 (Misener and others). This was twelve years after the earliest publication of completely measured heat flow (Bullard, 1939; Benfield, 1939), a period that included the Second World War. Canada was the third country, after the United Kingdom and the United States, to produce heat-flow data, and was followed by Australia, Poland, South Africa, and Iceland.At present, heat-flow values have been published or submitted for publication from 298 sites in Canada, including the continental shelves. A list of these data is to be found in Jessop (1989). A “site” may include …
A NEW GLOBAL HEAT FLOW COMPILATION
Are Granites Representative of Heat Flow Provinces?
The linear relationship between heat flow and heat production has been commonly interpreted in terms of distribution of radioelements with depth. The slope of the relationship (or thermal depth), which also has the dimension of length, needs to be considered in terms of other data constraining the distribution of heat-producing elements with depth. Measurements in deep oreholes or from sampling granitic plutons with respect to elevation fails to represent the assumed models of heat production distribution with depth. No clear trend can be surmised from these data. The enrichment in radioelements which is frequently observed in the uppermost part of …
Heat-Flow Data from the Western Margin of the West African Craton (Mauritania)
Eighteen new heat flow determinations in shallow boreholes (100-230 m) at three sites in West Africa (Mauritania) are presented. The first site is located in the Archaean province (Reguibat shield) of the West African craton. Temperature measurements were performed in iron formation and needed correction for refraction. The average value is 50 mW m-2 and radioactive element distribution in surface rocks provides an upper crust heat contribution of 1.8-mu-W m-3. The second site, located near the craton margin, and the third site, located in the Senegal coastal basin, display a slightly higher value of 59 mW m-2.