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 42 for “"Hydrothermal Fluid"”.
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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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Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes
… massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and chemistry). Chapter 2 investigates the morphology, mineralogy, and geochemistry of SMS deposits from six vent fields …
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Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes
… massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and chemistry). Chapter 2 investigates the morphology, mineralogy, and geochemistry of SMS deposits from six vent fields …
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Deciphering the 4-D geological framework of the Taupo-Reporoa Basin: Implications for hydrothermal fluid flow and volcanism
The Taupo-Reporoa Basin (TRB) represents the easternmost basin in the central Taupo Volcanic Zone (TVZ), North Island, New Zealand, and hosts >2000 MW of the 4200±500 MW of heat output within this arc setting. Its geographic alignment with active volcanic centers (Okataina, Taupo), geophysical …
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Modelling and analytical studies of magmatic-hydrothermal processes
Hydrothermal processes play a major role in transporting mass and energy in Earth’s crust. These processes rely on hydrothermal fluid, which is dissolving, transporting and precipitating minerals and distribute heat. The composition of the hydrothermal fluid is specific for various geological …
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The magmatic-hydrothermal fluid history of the Harrison Pass Pluton, Ruby Mountains, NV: implications for the Ruby Mountains-East Humboldt Range metamorphic core complex and Carlin-type Au deposits
… with emplacement of the HPP was a regional hydrothermal fluid event responsible for deposition of >200 Moz of Au in sediment-hosted Carlin-type deposits (CTD's) along four linear trends. Magmatic, meteoric, and metamorphic models have been invoked to explain the origin of fluids and Au for …
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Hydrothermal alteration of upper oceanic crust formed at fast spreading rates
Hydrothermal circulation plays a fundamental role in the chemical transfer from deep in the Earth’s interior to the ocean crust, the oceans and the atmosphere. It is also on of the principal mechanisms for heat transfer from the mantle to the oceans, atmosphere and ultimately, outer space. This …
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Paleofluid Flow, Fracturing and Reservoir Implications in Foreland basins: an example from the Cretaceous Qamchuqa Formation, Kurdistan Iraq
… are structurally controlled and affected by hydrothermal fluid flow and represent one of the major and important reservoir rocks in the High Folded oilfields. An integrated study combining field observations, core descriptions, microstructural analysis, petrographic study, stable C, O and Sr …
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Paleogeothermal Conditions in the Illinois Basin During Late Paleozoic Coalification
… that topographically driven regional flow of hydrothermal fluids through the Upper Paleozoic Lower Paleozoic aquifers raised the temperature and caused an inflection(s) found in the paleogeotherms. The purpose of this dissertation was to; characterize the paleogeothermal architecture of the …
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RE – OS AND PGE GEOCHEMISTRY OF ORGANIC-RICH SEDIMENTARY ROCKS AND PETROLEUM
… that they are caused by contamination by a hydrothermal fluid sourced from either Cenozoic intrusive units or the mantle. Strain localisation is suggested to have caused the main basin bounding faults within the Viking Graben and East Shetland Basin to be of sufficient depth to act as …
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The igneous petrology, thermal history, and genesis of sedimentary rock-hosted Au deposits in the northern Battle Mountain mining district, Nevada
… north-central Nevada hosts deposits of magmatic-hydrothermal origin, including porphyry, skarn, and distal disseminated deposits, as well as sedimentary-rock hosted Au deposits of uncertain origin. This dissertation examines the ages of magmatism and mineralization in the Battle Mountain mining …
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An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents
… radiation due to the high temperature of the hydrothermal fluid (-350°C). This light is dominant at wavelengths greater than 700 nm. At flange pools, where the fluid is relatively stable, only thermal radiation is present. Black smokers and beehives, however, are subject to mixing with ambient …
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An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents
… radiation due to the high temperature of the hydrothermal fluid (~350°C). This light is dominant at wavelengths greater than 700 nm. At flange pools, where the fluid is relatively stable, only thermal radiation is present. Black smokers and beehives, however, are subject to mixing with ambient …
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Magmatic-hydrothermal evolution of the Tuvatu alkalic epithermal Au-Telluride deposit, Viti Levu, Fiji
… to reconstruct the evolution of the magmatic-hydrothermal system and to identify the relative timing of Au mineralization. Eight vein types have been identified, including four porphyry-style veins which formed at higher temperatures and larger pressures, and four epithermal-style veins …
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Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield
… alteration events are interpreted as metasomatic fluid in filtration events which were focused along the VCR horizon. The second alteration event involved K⁺metasomatism which affected the footwall and hanging wall rocks up to a distance of several metres away from the VCR The third alteration …
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Fluid flow and deformation history of the Denver basin, CO region: fluid inclusions, U-Pb geochronology and isotope geochemistry of calcite-filled fracture cements in the Niobrara Formation
… faults, open stylolites) acted as conduits for fluid flow. However, little to no constraints on the origin, temperature, composition, and timing of these fluid flow events exist. We address this through analysis of fracture-filling cements in the Niobrara Formation with the integration of …
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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… metalloid concentrations) of 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 …
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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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Re-evaluation of Kombat-style mineralisation and implications for exploration in the Otavi mountainland, Namibia
… ̊35’ 00” E (WGS84) based on the field geology, fluid inclusions, petrology, mineralogy and geochemistry. This was to determine the genetic relationship between Fe-Mn and Cu-Pb mineralization. The study has established that the Cu-Pb ore at the Kombat Mine can be classified as an MVT-type …
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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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