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Dissertations / Theses on the topic 'Magmatic-hydrothermal system'

Author: Grafiati

Published: 10 March 2023

Last updated: 19 July 2025

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1

Smith, Daniel James. "From slab to sinter : the magmatic-hydrothermal system of Savo Volcano, Solomon Islands." Thesis, University of Leicester, 2008. http://hdl.handle.net/2381/8207.

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This PhD was made possible by funding from the Natural Environment Research Council and the British Geological Survey. Additional funds came from the Society of Economic Geologists, Robert’s Skills Fund, Whitaker Fund, the Mineralogical Society and the Geochemical Society.

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2

Liu, Lei. "Heat transfer from a convecting crystallizing, replenished magmatic sill and its link to seafloor hydrothermal heat output." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37215.

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Hydrothermal systems at oceanic spreading centers play an important role in the composition of seawater, the formation of ore deposits, the support of microbial and macrofaunal ecosystems, and even for the development of life on early earth. These circulation systems are driven by heat transport from the underlying magma chamber, where latent heat of crystallization and sensible heat from cooling are transferred by vigorous, high Rayleigh number convection through a thin conductive boundary layer. The traditional study of magmatic-hydrothermal systems is primarily based on the time-series o

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3

Choi, Jaewoon. "The response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridges." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/50575.

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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 consider a two-dimensional rectangular box that is 1.5 km deep and 4 km long with homogeneous permeability. Impermeable, insulated conditions are imposed on the left and right hand boundaries. To simulate time-varying heat flux from a sub-axial magma chamber of 500 m long half-width, I consider a vari

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4

Drieberg, Susan L. "The magmatic-hydrothermal architecture of the Archean Volcanic Massive Sulfide (VMS) System at Panorama, Pilbara, Western Australia." University of Western Australia. School of Earth and Geographical Sciences, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0064.

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[Truncated abstract. Formulae and special characters can only be approximated here. Please see the pdf version of this abstract for an accurate representation.] The 3.24 Ga Panorama VMS District, located in the Pilbara Craton of Western Australia, is exposed as a cross-section through subvolcanic granite intrusions and a coeval submarine volcanic sequence that hosts Zn-Cu mineralization. The near-complete exposure across the district, the very low metamorphic grade, and the remarkable preservation of primary igneous and volcanic textures provides an unparalleled opportunity to examine the P-

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5

Busane, Emmanuel Aganze. "Sulphide textures and compositions associated with the hydrothermal/magmatic system of the Twangiza gold deposit (South Kivu, DRC)." Thesis, Rhodes University, 2019. http://hdl.handle.net/10962/76588.

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Twangiza mine is a gold deposit situated in the eastern Democratic Republic of Congo. The rock types at the Twangiza Mine consist of black shale, including carbonaceous mudstone and thin intercalated layers of siltstone, and feldspar-rich granitoid intrusive sills, referred to as albitite, folded into a major antiformal structure. The gold mineralization at the mine is commonly found associated with sulphides. The sulphide textures and compositions of mineralized and unmineralized samples of black shales, albitite sills and hydrothermal veins in the mine are considered for the understanding of

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6

Arnoux, Gillean. "Novel Insights into Mass and Energy Transfer and Mid-Ocean Ridges from Seismic Imaging of the East Pacific Rise and Juan de Fuca Ridge." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24532.

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In this dissertation, I use seismic imaging and waveform modeling methods to investigate melt migration processes and the structure of the magma plumbing system beneath the East Pacific Rise (EPR) and Endeavour segment of the Juan de Fuca Ridge, respectively. This work begins by studying shallow mantle reflections beneath the EPR. I find the amplitude versus offset and waveform characteristics of the reflections to be consistent with a sub-horizontal dunite channels located up to 20 km off-axis. The depth of the dunite channels correlate with patterns of mantle melt delivery and the predicted

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7

Hames, Benjamin P. "Evolution of the Late Cretaceous Whistler Au-(Cu) porphyry corridor and magmatic-hydrothermal system, Kahiltna terrane, southwestern Alaska, USA." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50184.

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The Whistler Corridor is located in the Alaskan Range 150 km northwest of Anchorage. Hosted by the regionally extensive Kahiltna flysch terrane, the Whistler Igneous Suite (WIS) volcano-magmatic sequence is calc-alkalic, metaluminous, and exhibits an arc related trace element signature. Extrusive rocks comprise andesite flows, volcaniclastic rocks, and hypabyssal dykes and sills. Intrusive rocks are dioritic with two major phases. An initial phase associated with porphyry mineralisation was dated by zircon U-Pb (CA-TIMS) at 76.4 ± 0.3 Ma. A later unmineralised phase had previously been determi

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8

Jensen, Eric Paul, and Eric Paul Jensen. "Magmatic and hydrothermal evolution of the Cripple Creek gold deposit, Colorado, and comparisons with regional and global magmatic-hydrothermal systems associated with alkaline magmatism." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280422.

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The Cripple Creek district, Colorado is renowned for its epithermal gold telluride veins which have produced over 21 million ounces of gold from an intensely altered alkaline diatreme complex (total production + economic resources of >900 tons Au, geologic resource >>1000 tons). Gold mineralization principally occurs as telluride minerals hosted by swarms of narrow veins composed of quartz ± fluorite, carbonate, adularia, pyrite > barite/celestite and accessory base metal sulfides. Mineralized hydrothermal breccias are also found in the district, along with low-grade, bulk tonnage resources th

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9

Hollis, Lucy. "Cretaceous porphyry magmatic-hydrothermal systems in the Tchaikazan River area, southwest B.C." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/15291.

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The Hub, Charlie and Northwest Copper are spatially related mineral showings (Cu ± Mo) located in the Tchaikazan River area of southwest British Columbia. The Tchaikazan River area is located on the boundary between the Intermontane Belt and southeast Coast Belt (SECB). Evidence of magmatic-hydrothermal alteration is preserved throughout the study area. Multiple episodes of magmatic-hydrothermal activity are associated with these three centres of porphyry-style mineralization. The Hub diorite is the oldest dated pluton in the area, with a U-Pb zircon emplacement age of 81.19 ± 0.78 Ma. ZFT/AFT

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10

Reardon, Nancy Catherine. "Magmatic-hydrothermal systems and associated magnetite-apatite-actinolite deposits, Echo Bay, Northwest Territories." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/7543.

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Magnetite-apatite-actinolite deposits occur as pervasive replacement, veins, pods and breccias within wall rocks to the plutons of the Mystery Island intrusive suite at Echo Bay, Northwest Territories. The plutons and their altered wall rocks host previously-mined pitchblende, native Ag, Ni-Co arsenide veins. Although numerous studies were carried out on the pitchblende, native Ag, Ni-Co arsenide veins, the origin of the altered rocks which host them remains uncertain. Overall, this study reveals that the formation of magnetite-apatite-actinolite veins, pervasive replacement of rocks by albite

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11

Gulick, Virginia Claire. "Magmatic intrusions and hydrothermal systems: Implications for the formation of Martian fluvial valleys." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186325.

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This dissertation investigates the possible role of hydrothermally driven groundwater outflow in the formation of fluvial valleys on Mars. Although these landforms have often been cited as evidence for a past wanner climate and denser atmosphere, recent theoretical modeling precludes such climatic conditions on early Mars when most fluvial valleys formed. Because fluvial valleys continued to form throughout Mars' geological history and the most earth-like stream valleys on Mars formed well after the decline of the early putative earth-like climate, it may be unnecessary to invoke drastically d

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12

Dressel, Bárbara. "Analyse structurale, pétrologique et métallogénique de la minéralisation aurifère néoprotérozoïque du Granite de Passa Três, Campo Largo – PR, Sud du Brésil : implications sur les relations granite/minéralisation." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG023.

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Le Granite Passa Três est situé à l'Est de l'Etat du Paraná, au Sud du Brésil, et est allongé selon une direction NNE-SSW. Sa mise en place se fait au cœur des metapélites mesoprotérozoïques du Groupe Açungui (Province Mantiqueira). La minéralisation d’or du Granite Passa Três est composée par des veines de quartz contenant des quantités variables de fluorite, sulfures et carbonates. Les objectifs principaux de ce travail de thèse sont : de comprendre le modèle de formation du système de veines minéralisées en prenant en compte les relations entre magmatisme, hydrothermalisme, déformation et m

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13

Stavast, William James Andrew. "Three-Dimensional Evolution of Magmatic Hydrothermal Systems, Schultze Granite and Ruby Star Granodiorite, Arizona." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194841.

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The biotite bearing Schultze Granite (Globe-Miami district) and the biotite-hornblende bearing Ruby Star Granodiorite (Pima district) compose two intrusive centers that produced multiple porphyry copper deposits during the Laramide orogeny. Both magmatic-hydrothermal systems were dismembered and tilted by Tertiary extension, as indicated by tilted Tertiary sedimentary rocks, paleomagnetic data, and geobarometry, thereby producing extraordinary exposures of these magmatic-hydrothermal systems: ~ 1 to ~10 km (Globe-Miami district) and <1 to>12 km (Pima district). Ages of emplacement range

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14

Dyriw, Nicholas J. "Tectono-magmatic setting of Seafloor massive Sulfide systems: Investigating Solwara 1 Cu-Au deposit." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207956/2/Nicholas_Dyriw_Thesis.pdf.

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This thesis investigates the tectonic and magmatic setting of a Copper-rich seafloor massive sulfide deposit. Integrated multi-scale data analysis produced a regional to deposit-scale framework to constrain how, why and where these types of mineral deposits form. Outcomes from this research advance our understanding of 1) regional tectonic evolution of the East Manus Basin, and 2) volcanic and magmatic processes conducive to seafloor massive sulfide deposit formation.

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15

Nadeau, Olivier. "The behaviour of base metals in arc-type magmatic-hydrothermal systems - insights from Merapi volcano, Indonesia." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104612.

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Porphyry and high sulfidation epithermal ore-forming systems are genetically associated with calc-alkaline volcanism in subduction zones, and where erosion has not been too deep, the volcanic rocks are still commonly exposed in close proximity to the deposits. Most models for porphyry copper and high sulfidation epithermal gold systems include a shallow magmatic reservoir (the porphyry stock), an overlying hydrothermal cell, its alteration paragenesis and a stratovolcano. Some investigations also discuss the importance of underlying granitoid batholiths as feeders for porphyry stocks and their

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16

Mulja, Thomas. "Magmatic and hydrothermal processes in rare-element granite-pegmatite systems : the Preissac-Lacorne batholith, Quebec, Canada." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29092.

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Geological and mineralogical investigations of four moderately peraluminous monzogranitic plutons (Preissac, Moly Hill, Lamotte, Lacorne) in the Archean Preissac-Lacorne batholith (northwestern Quebec) indicate that each consists of biotite, two-mica and muscovite monzogranite facies, and that these facies are zonally distributed in this order from margin to core or the larger Lamotte and Lacorne plutons. Rare-element-enriched granitic pegmatites are associated with the Lamotte and Lacorne plutons and are also regionally zoned, in this case, with respect to their respective plutons, from beryl

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17

PAOLI, GABRIELE. "Petrogeochemical and geochronological framework of element mobilities during magmatic-metasomatic processes (Campiglia Marittima, Tuscany)." Doctoral thesis, 2017. http://hdl.handle.net/2158/1091251.

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Processes of post-magmatic element mobilisation have been reported for a number of magmatic-hydrothermal systems occurring in diverse geodynamic contexts. To constrain the processes that control these types of systems is a challenging task because the effects of hydrothermal/metasomatic processes on element distribution are poorly known, also the relationships of alteration types to mineralisation stages have not been well documented. This study presents the results of a detailed petrogeochemical and geochronological investigation, involving mineral and bulk-rock analysis as well as a precise

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18

Costa, Simone. "The active plumbing system of La Fossa (Vulcano, Italy): clues to mafic-silicic magma interactions and the link with the magmatic-hydrothermal environment." Doctoral thesis, 2021. http://hdl.handle.net/2158/1231940.

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La Fossa is the active volcanic center of Vulcano Island, the southernmost of Aeolian Islands (Italy). Although the volcano has been the site of many volcanological, petrological and geochemical studies since decades, some questions are still debated. Examples are the genetic relationships between the mafic and rhyolitic magmas, often involved in the same eruptions, and the depth of their storage. An additional limitation to the present knowledge comes from the fact that much of the deposits of La Fossa are ash-sized and, therefore, explosive phases of La Fossa volcanic history are less studie

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19

Hohf, Riveros Michael. "Magmatic-Hydrothermal Events, Mineralogy and Geochemistry of Tourmaline Breccia in the Giant Río Blanco – Los Bronces Porphyry Copper Deposit, Central Chile." 2020. https://tubaf.qucosa.de/id/qucosa%3A74410.

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The Río Blanco–Los Bronces (Chile) is one of the richest endowed porphyry copper-molybdenum districts worldwide, where about 20% of the known mineralization is hosted by tourmaline-cemented hydrothermal breccia. This work seeks: (1) to find a relationship between tourmaline chemical and/or isotopic composition and the degree of mineralization in the breccia, (2) to constrain the source of the mineralizing fluid in the breccia, and (3) to determine of the composition and age of intrusive units in three new exploration projects and correlate them with the known intrusive rocks of the mine areas

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20

Anenburg, Michael. "Controls on critical metals in magmatic and hydrothermal systems." Phd thesis, 2019. http://hdl.handle.net/1885/164905.

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Metals with high demand and a supply risk are called critical metals. One solution to the criticality problem is source diversification. We do not fully understand critical metal enrichment in ore deposits. I focus on two groups: the rare earth elements (REE) and the platinum group elements (PGE). At Nolans, NT, REE are hosted in fluorapatite veins up to several metres thick. I show experiments testing two formation hypotheses. First, I tested whether REE are hydrothermally mobile. I ran layers of rock-like compositions, REE-free apatite, REE, and a saline solution in piston cylinder experime

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21

Carr, Patrick. "Tourmaline geochemistry and cassiterite geochronology of highly evolved tin granites and their hydrothermal systems in eastern Australia." Phd thesis, 2018. http://hdl.handle.net/1885/164200.

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Three models have been proposed for cassiterite (SnO2) mineralisation in magmatic–hydrothermal environments: (1) magmatic crystallisation from a granitic melt, (2) late-stage magmatic partition of Sn into a fluid or vapour phase and subsequent cassiterite deposition, and (3) hydrothermal leaching of Sn from granite and/or country rocks and subsequent deposition. The complex chemistry of the ‘tin’ granites, and the large and pervasive hydrothermal systems which can overprint and destroy primary features make understanding the processes responsible fo

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22

Davidson, P. "A new methodology for the study of the magmatic-hydrothermal transition in felsic magmas: applications to barren and mineralised systems." Thesis, 2004. https://eprints.utas.edu.au/710/1/Paul_Davidson_Thesis_1.pdf.

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This study aims to develop a robust research methodology to examine the evolution of magmatic volatile phases during the cooling of felsic magmas via detailed melt- and fluid-inclusion studies, in particular the investigation of inclusions originally containing both melt and aqueous fluid. Then, using these techniques I will examine fluid immiscibility processes in two felsic magmatic systems, one mineralised, the other barren. In particular, I address the constraints on the exsolution of magmatic vapour and aqueous liquids, and how it is manifested in quartz-hosted inclusions, as well as th

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23

Berkenbosch, HA. "Magmatic fluids in seafloor hydrothermal systems : an in-depth mineralogical, trace element and isotopic study of sulfide chimneys from Brothers volcano, Kermadec arc." Thesis, 2017. https://eprints.utas.edu.au/23786/1/Berkenbosch_whole_thesis.pdf.

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Brothers submarine caldera volcano is one of 30 large volcanic centres that comprise the Kermadec arc, which stretches for ~1300 km NE of New Zealand. The NW Caldera vent field at Brothers straddles the caldera wall and hosts numerous, active, high-temperature (up to 302°C) black smoker chimneys and a greater number of inactive, sulfide-rich spires. The addition of magmatic fluids to the hydrothermal system is indicated by high \(^3He\), `CO_(2(g))`, and `H_2S_((g))` concentrations, low pH, and negative `δ^(15)N` and `δD_(H2O)` values for the vent fluids, in concert with local advanced argilli

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24

Blaine, Fredrick Allan. "The Effect of Volatiles (H2O, Cl and CO2) on the Solubility and Partitioning of Platinum and Iridium in Fluid-Melt Systems." Thesis, 2010. http://hdl.handle.net/10012/5465.

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Volatiles are a fundamental component of the Magmatic-Hydrothermal model of platinum group element (PGE) ore deposition for PGE deposits in layered mafic intrusions such as Bushveld and Stillwater. Volatiles have the potential to complex with PGEs in silicate melts and hydrothermal fluids, increasing PGE solubility; in order to assess the models of PGE ore deposition reliable estimates on the solubilities in the various magmatic phases must be known. However, experimental studies on the solubility and partitioning behaviour of PGEs in mafic magmatic-hydrothermal systems under relevant condit

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