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 55 for “"hydrothermal system"”.
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Geophysical Investigation of the Yellowstone Hydrothermal System
… and hot springs), yet little is known about the hydrothermally active zones hundreds of meters beneath the features. Transient electromagnetic (TEM) soundings and 2D direct current (DC) resistivity profiles show that hydrothermal alteration at active sites have a higher electrical conductivity …
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Geochemistry of a volcanic hydrothermal system at Mount Spurr, Alaska
… research aims to characterize more fully the hydrothermal system and builds on published geological mapping, geophysical surveys, soil sampling, exploration drilling, and water sampling. Aqueous and mineralogical geochemical investigations at a field area on the south flank of Mt. Spurr focus …
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Modelling the La Soufrière hydrothermal system, St. Vincent and the Grenadines
… to build a reservoir model for the La Soufrière hydrothermal system. This project will lay the foundation for future models of this system and further develop St. Vincent’s geothermal energy. Reykjavík Geothermal provided the geological and geothermal data in which the models were based, …
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Seismic Q and velocity structure for the magma-hydrothermal system of the Valles Caldera, New Mexico
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Numerical Modeling of the Hydrothermal System at East Pacific Rise (EPR) 9 Degrees 50' N Including Anhydrite Precipitation
Seafloor hydrothermal systems have been intensively studied for the past few decades; however, the location of recharge zones and details of fluid circulation patterns are still largely uncertain. To better understand the effects of anhydrite precipitation on hydrothermal flow paths, we conduct 2-D …
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Microbial Diversity and Geochemical Energy Sources of Tutum Bay, Ambitle Island, Papua New Guinea, an Arsenic-Rich, Shallow-Sea Hydrothermal System
I investigate the hydrothermal system located in Tutum Bay, Ambitle Island, Papua New Guinea, a shallow-sea system ~5 - 10 meters below sea level that is arsenic-rich. Hydrothermal vents in the bay expel fluids with arsenite: AsIII) concentrations as high as 950 μg/L. To determine the role that …
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Uranium-series geochronology and stable isotope analysis of travertine from Soda Dam, New Mexico : a Quaternary record of episodic spring discharge and rivern incision in the Jemez Mountains hydrothermal system
… a paleohydrologic record for the Valles Caldera hydrothermal system in Northern New Mexico for at least the last 500 ka. Travertine-depositing springs occur in San Diego Canyon, the only surface drainage outlet for the Valles Caldera, along the intersection of the Jemez fault zone (JFZ) and the …
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The Mechanisms and Triggering of Earthquakes in the Ridge-Transform Environment
… the 9º50'N East Pacific Rise high-temperature hydrothermal system. The first chapter of my dissertation uses data collected from an ocean bottom seismometer array deployed along the plate boundary within the Gulf of California from October 2005 to October 2006. In this study, I detect and …
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Seismic chacterization of Vulcano island and Aeolian area by tectonic and seismo-volcanic events
… Italy) during 2004-2009, and the dynamics of the hydrothermal system. During the period of study, six episodes of increasing numbers of seismo-volcanic events took place at the same time as geothermal and geochemical anomalies were observed. These geothermal and geochemical anomalies have been …
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Fluid Inclusion Characteristics in Magmatic-Hydrothermal Ore Deposits
Magmatic-hydrothermal ore deposits are formed in association with aqueous fluids that exsolve from hydrous silicate melts during ascent and crystallization. These fluids are invariably trapped as inclusions in vein-filling minerals associated with hydrothermal fluid flow, and their composition may …
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Petrology and geochemistry of precious and base metal mineralization, North Amethyst vein system Mineral County, Colorado
… may indicate that they formed in a localized hydrothermal system that predated the extensive hydrothermal system from which ores of the central and southern Creede district are proposed to have been deposited. Least radiogenic and paragenetically early mineral assemblages bold the most promise …
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Thermal History of the Chesapeake Bay Impact Crater
… performed to characterize a possible post-impact hydrothermal system. Thermal maturity and radiogenic techniques were used to estimate the temperature history of the crater sediments. Core samples from one borehole just outside the crater, two within the annular trough, and one shallow borehole …
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Verification of numerical models for hydrothermal plume water through field measurements at TAG
Hydrothermal vents discharge superheated, mineral rich water into our oceans, thereby providing a habitat for exotic chemosynthetic biological communities. Hydrothermal fluids are convected upwards until they cool and reach density equilibrium, at which point they advect laterally with the current. …
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Verification of numerical models for hydrothermal plume water through field measurements at TAG
Hydrothermal vents discharge superheated, mineral rich water into our oceans, thereby providing a habitat for exotic chemosynthetic biological communities. Hydrothermal fluids are convected upwards until they cool and reach density equilibrium, at which point they advect laterally with the current. …
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Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada
… samples are considered to help classify the hydrothermal system present at Scraper in addition to soil and rock chip samples. Finally, drill-hole data from 9 holes were logged and drawn in cross-section to offer one three-dimensional possibility of the hydrothermal system at Scraper. Results …
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The influence of geothermal sources on deep ocean temperature, salinity, and flow fields
… In Chapter 2 evidence for the influence of a hydrothermal system in the rift valley of the Mid-Atlantic Ridge on nearby property fields and a model of the flow around such a heat source are presented, with an analysis of a larger-scale effect. Results of an analytical model for a heat source …
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The influence of geothermal sources on deep ocean temperature, salinity, and flow fields
… In Chapter 2 evidence for the influence of a hydrothermal system in the rift valley of the Mid-Atlantic Ridge on nearby property fields and a model of the flow around such a heat source are presented, with an analysis of a larger-scale effect. Results of an analytical model for a heat source …
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Deep explosive volcanism on the Gakkel Ridge and seismological constraints on shallow recharge at TAG active mound
… are used to image subsurface processes at the hydrothermal system. Over nine-months, 32,078 local microearthquakes (ML = -1) with single-phase arrivals cluster on the southwest flank of the deposit at depths <125 m. Microearthquakes characteristics are consistent with reaction-driven cracking …
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