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2017 | Buch

Geothermics

Heat Flow in the Lithosphere

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Über dieses Buch

This book, now in its second edition, offers a comprehensive and modern treatment on the background knowledge of heat transfer processes in the lithosphere. In the light of the success of the first edition, several chapters of the book have been revised and the book has been enriched with a new chapter on geothermal methods used for the inference of past climate changes.The book starts with a brief review of global tectonics and of the structure of the crust and upper mantle. Then the theory of heat conduction as well as the thermal properties and the methods for the determination of thermal conductivity and radiogenic heat are introduced. Subsequently the geothermal flow and the thermal state of the lithosphere and deep interior are analyzed. The formation, upwelling mechanisms, solidification and cooling of magmas, which can be a fundamental heat source in many geothermal systems, are reviewed. Analytical methods used for gaining information on heat and groundwater flow from the analyses of temperature depth data are also covered. Data and practical examples are supplied to facilitate the understanding of the different topics.The book is intended for Earth science graduate students and researchers.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Lithosphere Structure and Dynamics
Abstract
This chapter introduces the composition and the basic physical features, namely seismic wave velocity and discontinuities, density and elastic properties, of the lithosphere and underlying asthenosphere. It is shown how the lithospheric thickness can be inferred from the elevation of the Earth’s surface in regions in isostatic equilibrium. The fundamentals of global tectonics, the mechanisms which provide the energy dissipated in earthquakes, volcanic eruptions and orogenesis, and the forces which act on the plates are also briefly outlined.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Chapter 2. Heat Conduction and Thermophysical Parameters
Abstract
This chapter presents the basic equations for conductive heat transfer and the main thermal parameters of the rocks, in particular the thermal conductivity and radiogenic heat. Also, it outlines the most commonly used techniques for measuring these parameters. Models involving the application of mixing laws for a mineral aggregate are discussed together with techniques for estimating the in situ thermal conductivity and volumetric heat capacity. Finally, methods for determining the radiogenic heat in the crust are introduced.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Chapter 3. Thermal Structure
Abstract
The ground surface temperature, the geothermal flow and the rock radiogenic heat provide evidence of the heat transfer processes and allow the determination of the thermal structure of the lithosphere. This chapter describes the fluctuation in the subsurface temperature, caused by ground surface temperature variations, and the main heat sources of geothermal flow. The primordial heat and cooling of the Earth are outlined as well as the radiogenic heat as a function of time and the heat originated by transient perturbations yielded by tectonothermal processes. The intersection between geotherms and the upper mantle solidus supplies an estimate of the thickness of the continental plate. By modelling the oceanic plate cooling as a semi-infinite solid initially at uniform temperature, the temperature and thickness of the lithosphere can be assessed together with the geothermal flow and the seafloor depth. In addition to the thermal structure of the deeper interior, this chapter also gives an insight into mantle convection.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Chapter 4. Temperature and Magmatic Processes
Abstract
Physical and chemical instabilities in the Earth’s interior may cause the formation of magma, phenomenon which consequently creates a mechanical disequilibrium with the surrounding rocks. The magmatic fluid attempts to find an equilibrium condition through energy and mass transfer from the bottom upwards. The volcanic activity is therefore the surface expression of a redistribution of the internal energy of the Earth through an advection mechanism. This chapter focuses on the magma formation processes, upwelling mechanisms and the parameters that control its rheological behaviour. Solidification, involving phase change, and cooling of intrusive igneous bodies and lava covers are also dealt with.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Chapter 5. Heat in the Groundwater Flow
Abstract
The presence of groundwater flow implies other heat transfer mechanisms rather than pure conduction. Several strategies have been developed to explore the heat transport associated with water flow. This chapter presents some analytical methods and shows how flow in a permeable layer can be inferred from the borehole temperature measurements. Heat advection along horizontal, descending and ascending branches of an aquifer is discussed. We also show how to estimate heat advection, together with the geometrical characteristics of the flow path and the water travel time, of a hydrothermal system. An example is given of thermal convection in a deep carbonate aquifer as inferred from temperature recorded in petroleum wells.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Chapter 6. Subsurface Temperature and Climate Change Reconstruction
Abstract
Subsurface temperature field forms an independent archive of past climate changes that is complementary to both the surface air temperature observations and the traditional climate proxy data, each with particular strengths and limitations. In this chapter, we focus on the contribution of temperature measurements in deep boreholes to the inference of climate history. The ground surface temperature variations can be reconstructed by inverting the borehole temperature perturbations. Moreover, the joint analysis of temperature recorded in borehole and surface air temperature time series yields estimates of the pre-observational mean of surface air temperature. We also show how the subsurface temperature variations by a short wavelength climate change can be modelled with a known time-dependent temperature boundary condition.
Vincenzo Pasquale, Massimo Verdoya, Paolo Chiozzi
Backmatter
Metadaten
Titel
Geothermics
verfasst von
Vincenzo Pasquale
Massimo Verdoya
Paolo Chiozzi
Copyright-Jahr
2017
Electronic ISBN
978-3-319-52084-1
Print ISBN
978-3-319-52083-4
DOI
https://doi.org/10.1007/978-3-319-52084-1