Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"surface heat flow"”.
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Surface heat flow and lithospheric thermal structure of the northwestern Arabian Plate
The surface heat flow (qs) is paramount for modeling the thermal structure of the lithosphere. Changes in the qs over a distinct lithospheric unit are normally directly reflecting changes in the crustal composition and therewith the radiogenic heat budget (e.g., Rudnick et al., 1998; Förster and …
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Geothermal regime of the Williston Basin in North Dakota
… analysis of the relationships among radiogenic heat production, surface heat flow, formation temperatures, and gravity and magnetic anomaly patterns. Digital processing of the spatial and causal relationships gives insight into the effect of basement heat production on the thermal state of the …
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A Bayesian Reappraisal of Australian Crustal Heat Flow and Temperature
… the Bayesian re-appraisal of Australian crustal heat flow and temperature data. This has been achieved by defining sensitivity kernels for surface heat flow determinations, examining the sources and magnitudes of noise in primary geothermal data sets, and developing methods to assign …
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A Bayesian Reappraisal of Australian Crustal Heat Flow and Temperature
… the Bayesian re-appraisal of Australian crustal heat flow and temperature data. This has been achieved by defining sensitivity kernels for surface heat flow determinations, examining the sources and magnitudes of noise in primary geothermal data sets, and developing methods to assign …
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Vakarų Lietuvos geoterminės anomalijos prigimtis /
… lithosphere of the region. Inventory of similar heat flow anomalies in the cratons worldwide indicates a strong correlation with age of lithosphere increasing form Archean (41 – 46 mW/m2) to Proterozoic (49 – 54mW/m2). It is related mostly with different amount of heat generating elements in the …
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The geothermal potential of Luxembourg
… The lack of deep boreholes and subsurface temperature prognosis at depth is circumnavigated by using thermal modelling for inferring the geothermal resource at depth. For this approach, profound structural, geological and petrophysical input data are required. Conceptual geological …
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Temperature and heat flow modeling of three-dimensional bodies in a two-layered half space
… was made of steady-state temperature and heat flow anomalies in the earth's crust caused by contrasts in heat production and thermal conductivity. Exact expressions were derived for the temperature and heat flow anomalies caused by polygonal prism heat sources in a half space overlain by a …
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Modelling the La Soufrière hydrothermal system, St. Vincent and the Grenadines
… and resistivity values), topographic data, surface manifestations and previous conceptual models. This conceptual model was built using Leapfrog Geothermal and was subsequently used as the basis for the TOUGH2 numerical model. A natural state TOUGH2 model was calibrated using downhole …
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Incorporating prior information into geophysical inversion: from regularized inversion of thermal data to a framework using conditional variational autoencoders
… to understanding and characterizing the subsurface. However, traditional inversion methods recover models with smooth features that do not resemble geologic structures. Incorporating prior information into inversion can encourage geologic realism in recovered models, but how best to do so …
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The controls of radioelement distribution in the Etive and Cairngorm granites: Implications for heat production
… on their radioelement geochemistry and heat production which is interpreted in a geothermal context. <br></br><br></br>The Etive Complex is a multiphase intrusion, ranging from diorite to granite in composition, emplaced by a cauldron subsidence mechanism. Its complex magmatic history …
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The thermal and mechanical structure of stable continental lithosphere within a dynamic mantle
… role of continental lithosphere in the Earth's heat loss system, but also for determining the deformation response of continental lithosphere. This thesis presents the results from numerical simulations and scaling analyses for two studies that solve for: (1) the thermal structure of stable …
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Seismic Velocity and Radial Anisotropy in the Crust and Upper Mantle of the South Central United States from Surface Wave Tomography
… do not follow geological boundaries on the surface. A high-velocity lithosphere to ~75 km exists across the entire region except at a few local uplifts (Uvalde, Sabine, and Benton), the Arkansas River Valley, and the Mississippi Valley Graben. A low-velocity layer with positive radial …
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Effects of lithospheric strength on convection in the Earth's mantle
… either through subduction for plate-scale flow, or as localized convective instability beneath lithospheric plates. The deformation associated with these processes is resisted by the extreme temperature-dependence of the lithosphere's strength. Ways in which lithosphere deformation affects …
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Igneous and metamorphic processes in the Shap Granite and its aureole
… apart from in the Blue Quarry, where higher sub—surface heat flow during the granite's intrusion resulted in localised more extreme metamorphic and some metasomatic conditions resulting in the development of garnet veins. Analysis of 61 samples from the aureole region show only very limited …
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Geothermal processes at the Galapagos Spreading Center
The measurements of the heat flow field of the Galapagos Spreading Center in an area of about 570 km2 reveal the planform of the conductive flux and permit the first truly areal estimate of the near-axis heat flux for comparison with theoretical plate cooling models. The intrusion process and …
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The Thermal and Fluid Environment of the Cascadia Subduction Zone, Southern Washington State
… BSR data points in terms of temperature and heat flow. Localized differences between BSR heat flow and numerical models reflect an estimated regional mean upward fluid flow of 0.53 cm yr-1 for the survey area, with localized fluid flow approaching a maximum of 3.8 cm yr-1. At the deformation …
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Basin analysis of Tertiary strata in the Pattani Basin Gulf of Thailand
… locations. The amount of stretching as well as surface heat flow generally increases from the margin to the basin center. Crustal stretching factor varies from 1.3 at the basin margin to 2.8 in the center. Subcrustal stretching factor (8) ranges from 1.3 at the basin margin to more than 3.0 in …
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Thermobarometry and geochemistry of peridotite xenoliths from the southwestern margin of the Kaapvaal craton, South Africa
… of the lithosphere, in combination with surface heat flow data, suggest that thermal gradients beneath cratonic regions (Archean blocks which stabilized > 2.5 Ga) are lower than those in off-craton regions, commonly attributed to thinner lithosphere in Proterozoic domains. Although this …
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3d rheological modelling in the aegean region and its importance for the seismotectonics of the area
… main control on the BDT depth is exerted by the surface heat flow and the corresponding geothermal gradient. The results of the modelling have been successively applied mainly to the fields of seismotectonics and geodynamics for: i) estimating the maximum expected magnitudes of the major …
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Well-log based determination of rock thermal conductivity in the North German Basin
… input parameter for the determination of the heat-flow density; which, in turn, is applied as a major input parameter in thermal modeling at different scales. Drill-core samples, which are necessary to determine thermal properties by laboratory measurements, are rarely available and often …