References
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Ocenka teplovogo potoka po skvazhinam Garmskogo poligona (Estimation of heat flow in the wells of the Garm test site )
Geothermics of the Essaouira Basin in Morocco
The mean values of geothermal gradient and heat flow density have been estimated from bottom-hole temperatures taken from 75 petroleum exploration wells in the Essaouira basin in Morocco and are found to be 21.0 +/- 0.3 mK/m and 68 +/- 8 mW/m2, respectively. The regional thermal gradient varies with depth, from 30-35 mK/m near to the surface to about 18 mK/m between 2000 and 3000 m depth and then increasing again to over 24 mK/m at depths greater than 3000 m. The decrease at intermediate depths results from the presence of Triassic evaporites (with high thermal conductivities). Comparison of the …
Geothermal gradient anf heat flow values of some deep wells in sichuan basin
Characteristics of heat flow through diapiric salt structures on the Texas continental slope
A global analysis of heat flow from Precambrian terrains: Implications for the thermal structure of Archean and Proterozoic lithosphere
Previous studies of heat flow from Precambrian terrains have yielded two different relationships: a global temporal relationship between heat flow and tectonic age, and a regional spatial relationship between heat flow and the proximity of Archean cratons. We analyze heat flow from tectonically stable Precambrian terrains worldwide to address questions associated with these two heat flow patterns: (1) Is the spatial relationship a global pattern? (2) Do the two heat flow relationships have a common underpinning? In answer to the first question, our data analysis reveals a widespread spatial pattern between heat flow and the proximity of Archean cratons, which …
Can differences in heat flow between east and southern Africa be easily interpreted?: Implications for understanding regional variability in continental heat flow
We address the extent to which regional variations in continental heat flow can be interpreted, making use of a heat flow data set from east and southern Africa. The first-order observation deriving from these heat flow measurements is a common pattern characterized in both regions by low heat flow in Archean cratons and higher heat flow in younger mobile belts. Two regional differences between east and southern Africa are superimposed on this common heat flow pattern: (1) heat flow in the Tanzania Craton is about 13 mW m−2 lower than in the Kalahari Craton, and (2) heat flow in the …
Kinematics and tectonothermal modeling—interpretation of heat flow observed on the Tibetan Plateau
Thirteen heat flow values along a N-S profile are employed as surface constraints on a tectonothermal model of the Tibetan Plateau. The modeling demonstrates 40 Ma of crust-mantle temperature-history, since the India-Eurasia collision. The main emphasis in this paper is put on the fact that a series of heat-generating and heat-absorbing processes such as enhancement of radiogenic heating, strain- and friction-heating, partial melting etc., were induced by tectonic deformations of the lithosphere. On this basis, equations defining terrane deformations in forms of shortening, thickening, extension, uplift and erosion were deduced using the principles of plate kinematics and 3-D mass balance. …
Teplovoj potok Yuzhnogo Urala i ego svyaz' s tektonicheskimi faktorami (Heat flow of the South Urals and its relationship with tectonic factors )
Heat-Flow in the Bastar Craton, Central Indian Shield - Implications for Thermal-Characteristics of Proterozoic Cratons
Measurements of surface heat flow density in various lithologies from the central parts of the Proterozoic Bastar Craton of the central Indian Shield have yielded heat flow values ranging from 51 to 64 MW m-2, with a mean value of 56 mW m-2 (standard deviation = +/- 6.1 MW m-2). These values are considerably higher than in the Archaean and Archaean to Early Proterozoic cratons of many Precambrian shields, but are compatible with the heat flow data from the Proterozoic Gawler Craton, central Australian Shield. It is inferred that (1) the contrast in surface heat flow between the Archaean and …
Heat flow and temperature gradients in Chile
Heat flow from four new research drill holes in the Western Cascades, Oregon, U.S.A
Conceptual models of the thermal structure of the Oregon Cascade Range propose either (1) a narrow zone of magmatic heat sources, flanked by shallow heat-flow anomalies caused by lateral ground-water flow; or (2) a wide zone of magmatic heat sources, with localized, generally negligible ground-water effects. The proposed narrow heat source coincides with the Quaternary volcanic arc, whereas the wider heat source would extend 10–30 km west of the arc. To test the models, four new heat-flow holes were sited west of the Quaternary arc but within the area of the proposed wide heat source. The sites are separated from …
First heat flow density determinations from Southeastern Zaïre (Central Africa)
First heat flow density determinations from southeastern Zaïre are presented. Sites are located in the late Proterozoic metasedimentary cover of the Pan-African belt (600 Ma.). For each individual boreholes, heat flow ranges between 48 and 72 mWm−2. The average value of 62 mW m−2 for the sites is similar to that of 66 mW m−2 observed in Zambia. Both values are higher than what is expected for Pan-African terranes. These heat flow determinations in Shaba province of southeastern Zaïre, together with gravity and seismological observations, support the hypothesis of lithospheric thinning for this area. As already suggested for Zambia, this …
Terrestrial heat lfow in western part of Fujian Province, SE China
Heat flow and geothermal processes in Iceland
Heat flow values, derived from temperature measurements in shallow boreholes in Iceland, vary substantially across the country. The near-surface temperature gradients range from almost 0 to 500°C/km. The thermal conductivity of water-saturated rocks varies from 1.6 to 2.0 W/m°C. The temperature gradient in Iceland is mainly dependent on four factors: 1.(1) the regional heat flow through the crust,2.(2) hydrothermal activity,3.(3) the permeability of the rock, and (4) residual heat in extinct volcanic centers. As Iceland is mainly made of basaltic material the radiogenic heat production is almost negligible. The thermal conductivity is, on the other hand, mainly influenced by the …
Heat Flow and Thermal Models of the Barbados Ridge Accretionary Complex
The pattern of heat flow from the Barbados Ridge accretionary complex has been derived from marine surveys with heat flow probes, from measurements in drill holes, and from the depths of bottom-simulating seismic reflectors caused by gas hydrate. The heat flow from the accretionary complex has been simulated using a finite-difference model to investigate how heat flow responds to changes in the cross-sectional shape of the complex and the rate of convergence, and to variations in pore-fluid pressure within the complex and along the decollement at its base. In the south of the complex, heat flow decreases westward from the …
Vertical variation of heat flow density in the continental crust
Terrestrial heat flow density is a key parameter in understanding the past, present and future development of our planet. Most phenomena studied in deep crustal geophysics are temperature dependent and therefore reliable assesments of deep temperatures are necessary. Most heat flow measurements have been made in drill holes which are shallow (< 1 km) in comparison to the thicknesses of the crust and lithosphere. The recent findings in deep drilling projects (e.g. the Kola deep hole in Russia and the KTB hole in Germany) have yielded results which suggest that there is a distinct contrast between heat flow densities …
Teplovoj rezhim i glubinnaya struktura Srednego Urala (Thermal regime and deep structure of the Middle Urals )
Heat Flow Measurements in the Ayu Trough
Heat-Flow Map of Northern and Central Parts of the Fennoscandian Shield Based on Geochemical Surveys of Heat Producing Elements
The heat flow-heat production (Q-A) relationship is a useful tool in geothermal research, and it has been widely used for delineating geothermal provinces and determining characteristic parameters of heat production in the continental crust. In this study, a simple but rarely used technique of utilizing the heat flow-heat production relationship is discussed. In central and northern parts of the Fennoscandian Shield extensive geochemical surveys have produced 1483 samples taken from glacial till with a sampling density of 1 sample/300 km2. Heat production values determined from U, Th and K concentrations in these samples were used to calculate a map of …
Heat flow and deep temperature in South Portugal
Heat-flow density determinations were made in South Portugal. The region of study covers the Algarve Basin, the South Portuguese Zone, part of the Ossa Morena Zone and part of the Lusitanian Basin. Two sets of data were used to obtain heat-flow density values in this region: 13 determinations were made in boreholes under equilibrium conditions and 4 determinations in oil exploration boreholes. Gravity and aeromagnetic data were used to constrain the interpolation of the heat-flow density isolines in the South Portuguese Zone and part of the Ossa Morena Zone. Seismic data were used to model two-dimensional heat transfer through a …