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 59 for “"hydrothermal systems"”.
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Finite-Element Approach to the Modeling of Hydrothermal Systems
Made available in DSpace on 2014-12-11T18:10:05Z (GMT). No. of bitstreams: 1 7405642.pdf: 3398073 bytes, checksum: 57e5c0cb937e845d6a2bf577ec434470 (MD5) Previous issue date: 1973
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Fluid Flow Processes at Mid-Ocean Ridge Hydrothermal Systems
… and temporal variability of mid-ocean ridge hydrothermal systems are examined from a largely theoretical standpoint. The nature of tidal signals is considered in detail and there is a discussion of the mechanisms by which the tidal modulations observed at seafloor hydrothermal systems might …
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Rare earth element systematics in ancient and modem hydrothermal systems
… to those formed during the waning phases of hydrothermal systems and off-axis crustal ageing processes, has been investigated through a comparison of the rare earth element (REE) systematics of hydrothermal materials from the ore-forming hydrothermal systems of the TAG vent field, 26 N …
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The chemistry of iron and manganese in submarine hydrothermal systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1980.
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Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems
… and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 through 5 of this thesis are disparate in focus, each represents a novel investigation aimed at furthering our understanding of subsurface geochemical processes affecting …
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Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems
… and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 through 5 of this thesis are disparate in focus, each represents a novel investigation aimed at furthering our understanding of subsurface geochemical processes affecting …
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Geochemical controls on the fluid evolution of submarine and subaerial ore-forming hydrothermal systems
Seafloor hydrothermal venting influences the chemistry of the oceans and crust, is linked to the development of chemosynthetic life, and is associated to the formation of volcanic-hosted massive sulfide (VHMS) deposits. Ore-forming processes related to VHMS deposits are one of the oldest on Earth …
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Topographic reconstructions of the Variscan Belt of Western Europe through the study of fossil hydrothermal systems
This thesis presents the first stable isotope quantification of paleoaltimetry for the Variscan Belt of Western Europe that integrates late-Carboniferous hydrogen isotope ratios of meteoric water in the internal zones in the Armorican Massif (AM) and the French Massif Central (FMC) with …
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CO₂ and Heat Release from Magmatic Hydrothermal Systems: Insights from CO₂ Flux and Other Modern Methods
Magmatic hydrothermal systems are of interest as a renewable energy source. In areas of high permeability, these systems are commonly manifested at the Earth’s surface as areas of steam heated ground. Ground based heat flux and CO2 flux surveys typically result in 100’s or 1000’s of individual flux …
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The response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridges
Hydrothermal processes at oceanic spreading centers are largely influenced by changing magmatic heat input. I use the FISHES code to investigate the evolution of surface temperature and salinity as a function of time-varying heat flux at the base of a two-phase, vapor-brine hydrothermal system. I …
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Numerical Modeling of Two-Phase Flow in the Sodium Chloride-Water System with Applications to Seafloor Hydrothermal Systems
… time-dependent salinity variations in seafloor hydrothermal vent fluids, quasi-numerical and fully numerical fluid flow models of the NaCl-H2O system are constructed. For the quasi-numerical model, a simplified treatment of phase separation of seawater near an igneous dike is employed to obtain …
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A Parameterized Approach to Partitioning Between Focused and Diffuse Heat Output and Modeling Hydrothermal Recharge at The East Pacific Rise 9°50´N
Ever since the discovery of seafloor hydrothermal systems at mid ocean ridges, scientists have been trying to understand the complex dynamic processes by which thermal energy is transported advectively by chemically reactive aqueous fluids from Earth's interior to the surface. Hydrothermal systems …
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HYDROTHERMAL FLUID TRANSPORT PATHWAYS ALONG FRACTURES AND VEINS AT BROTHERS VOLCANO, SOUTHERN KERMADEC ARC
<p>Hydrothermal fluid flow in fractures and veins is a key component in the mineralization of economic metals within calderas. But there are several methods by which fractures can form. Regional extension, episodic caldera collapse, and fluid overpressure all have the potential to create brittle …
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Geochemical and isotopic characteristics of palaeo-hydrothermal fluids related to granite magmatism, S W England
… characterised the earliest episodes of palӕohydrothermal activity associated with the granites of S W England indicates that the abundance of trace carbon species (CO<sub>2</sub> , CH<sub>4</sub> ) and nitrogen in the fluids was correlated with the metasedimentary contribution to the …
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Spatial and temporal evolution of fluids in hydrothermal ore deposits
Magmatic-hydrothermal systems typically have vertical extents of several hundred<br />meters and their geochemical characteristics (e.g. mineral assemblages) vary considerably<br />over that vertical extent. As a consequence the expression in outcrop varies depending on<br />the level of erosion. …
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Exploring two-phase hydrothermal circulation at a seafloor pressure of 25 MPa: Application for EPR 9°50′N
… simulations of two phase flow in seafloor hydrothermal systems using the finite control volume numerical scheme FISHES. The FISHES code solves the coupled non-linear equations for mass, momentum, energy, and salt conservation in a NaCl-H2O fluid to model the seafloor hydrothermal processes. …
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Carbon and mineral transformations in seafloor serpentinization systems
… and distribution of carbon compounds in seafloor hydrothermal systems hosted in ultramafic rock. These processes have a direct impact on carbon budgets in the oceanic lithosphere and on the sustenance of microorganisms inhabiting hydrothermal vent ecosystems. Where mantle peridotite interacts with …
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Carbon and mineral transformations in seafloor serpentinization systems
… and distribution of carbon compounds in seafloor hydrothermal systems hosted in ultramafic rock. These processes have a direct impact on carbon budgets in the oceanic lithosphere and on the sustenance of microorganisms inhabiting hydrothermal vent ecosystems. Where mantle peridotite interacts with …
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The chemistry of iron in hydrothermal plumes
This thesis investigates the role of submarine hydrothermal vents in the global marine Fe<br/>budget. While debate continues over the sources of dissolved Fe to the global deep-ocean<br/>dissolved Fe budget, it had been presumed, until recently, that all the Fe emitted from<br/>hydrothermal vents …
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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… seafloor vent fluids and related deposits from hydrothermal systems in the Manus back-arc basin (Eastern Manus Basin, EMB and Manus Spreading Center, MSC) are used to investigate processes that affect their formation. Processes responsible for observed differences in fluids and deposits from …
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