Дисертації з теми "Accessory mineral"
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Paterson, Bruce Andrew. "Accessory mineral growth histories : implications for granitoid petrogenesis." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/11059.
Повний текст джерелаGoldschmidt, Gunther Karl. "Cloning, Sequencing and Partial Characterization of the Accessory Gene Region of Plasmid pTC-F14 isolated from the Biomining Bacterium Acidithiobacillus caldus f." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1588.
Повний текст джерелаPlasmid pTC-F14 is a 14.2kb promiscuous, broad-host range IncQ-like mobilizable plasmid isolated from Acidithiobacillus caldus f. At. caldus is a member of a consortium of bacteria (along with Acidithiobacillus ferrooxidans and Leptospirilum ferrooxidans) that is used industrially for decomposing metal sulphide ores and concentrates at temperatures of 40ºC or below which is now a well-established industrial process to recover metals from certain copper, uranium and gold-bearing minerals or mineral concentrates. These biomining microbes are usually obligately acidophilic, autotrophic, usually aerobic iron- or sulphur-oxidizing chemolithotrophic bacteria. Their remarkable physiology allows them to inhabit an ecological niche that is largely inorganic and differs from those environments populated by the more commonly studied non-acidophilic heterotrophic bacteria. At. caldus, is a moderately thermophilic (45 to 50ºC), highly acidophilic (pH1.5 to 2.5) sulphur-oxidizing bacterium, and its role as one of the major players in the industrial decomposition of metal sulphide ores has become evident in recent years. At. caldus f from which pTC-F14 was isolated was found to be one of two dominant organisms in a bacterial consortium undergoing pilot-scale testing for the commercial extraction of nickel from ores.
Betkowski, Wladyslaw Benedykt. "A STUDY OF PHOSPHATE ACCESSORY MINERALS, THEIR REACTIVITIES, REPLACEMENTS AND GEOCHRONOLOGY: IMPLICATIONS FOR THE LLALLAGUA TIN PORPHYRY EMPLACEMENT AND MINERALIZATION." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1532539010237075.
Повний текст джерелаSenni, Filippo. "Studio dei minerali accessori del basamento Varisico delle Alpi Apuane." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14453/.
Повний текст джерелаKegley, Dalton Curtis. "Economic Potential of Rare Earth Elements Within Accessory Minerals of Granitic Pegmatite Mine Tailings." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104065.
Повний текст джерелаMaster of Science
Rare Earth elements (REEs) are comprised of the Lanthanide series of elements as well as yttrium and scandium. REEs are economically important due to their critical applications within multiple industries. Current uses include electronics, magnets, lasers, electric motors, optical fibers, nuclear reactor control rods, visual displays, etc. Although the demand for REEs is high, the current sourcing of REEs is quite scarce. This study investigates the Spruce Pine district of North Carolina, testing the economic feasibility of repurposing current mine waste tailings as a rare earth element resource. Spruce Pine is home to several active quartz and feldspar mining operations, with large waste tailing piles generated during the separation process for quartz and feldspar. The mineralogy, composition and REE budget of the tailings was examined to assess the economic viability of rare earth element extraction. The waste tailing piles of two on-going quartz mining operations were sampled to evaluate the potential economic feasibility of rare earth element extraction from key accessory phases, including apatite, remaining from the initial separation process. The results of this investigation support the conclusion that, at the current recovery rate, price of rare earth elements, and cost of refinement, economic recovery of REE from the studied tailings is not viable. However, yttrium and dysprosium offer the highest potential for economic recovery. If some combination of improvements to the extraction process, reduction in cost of refinement, or increase in price were to occur, yttrium and dysprosium are sufficiently abundant that extraction could become economically viable.
Childe, Fiona. "Uranium-lead geochronology of metamorphic accessory minerals south of the Grenville Front, western Québec, Canada." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61060.
Повний текст джерелаMonazite and xenotime grains obtained from high grade metasediments at five locations between 45 and 70 km southeast of the Grenville Front yielded $ sp{207}$Pb/$ sp{206}$Pb ages of 999 $ pm$ 5 Ma to 1021 $ pm$ 2 Ma. Monazite from the norther part of this terrane also defined an upper intercept age of 2596 $ pm$ 3 Ma.
The southernmost sample location, 135 km south of the Grenville Front, yielded both monazite and rutile. Monazite gave an age of 1072 $ pm$ 2 Ma. Small populations of rutile yielded an age of 916 $ pm$ 2 Ma. (Abstract shortened by UMI.)
Prent, Alexander Martijn. "Microchemical and Microstructural Analysis of Major and Accessory Minerals During Fluid-Rock Interactions and Deformation." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/77367.
Повний текст джерелаLouw, Lilly-Ann. "Analysis of an 18kb accessory region of plasmid pTcM1 from Acidithiobacillus caldus MNG." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1667.
Повний текст джерелаBiomining organisms are generally found in metal-rich, inorganic environments such as iron and sulfur containing ores; where they play a vital role in mineralization and decomposition of minerals. They are typically obligatory acidophilic, mesophilic or thermophilic, autotrophic, usually aerobic, iron-or sulfur oxidizing chemolithotrophic bacteria. The most prominent biomining organisms used in bioleaching of metal sulfides are Acidithiobacillus ferrooxidans, At. thiooxidans, At. caldus, Sulfobacillus spp. and Leptospirillum spp. Biomining enables us to utilize low grade ores that would not have been utilized by conventional methods of mining. Research has focused on the backbone features of plasmids isolated from bacteria of biomining environments. The aim of this study is to sequence and analyze an 18 kb region of the 66 kb plasmid pTcM1 isolated from At. caldus MNG, focusing on accessory genes carried by this plasmid. Fifteen putative genes / open reading frames were identified with functions relating to metabolism and transport systems. The genes are located in two divergently located operons. The first operon carries features related to general metabolism activities and consists of a transcriptional regulator (ORF 2), a succinate / fumarate dehydrogenase-like subunit (ORF 3), two ferredoxin genes (ORF 4 and ORF 7), a putative HEAT-like repeat (ORF 6) which is interrupted by an insertion sequence (ORF 5) and a GOGAT-like subunit (ORF 8). The second operon contains an ABC-type nitrate / sulfonate bicarbonate-like gene (ORF 9), a binding protein-dependent inner membrane component-like gene, another ABC sulfonate / nitrate-like gene (ORF 12i and 12ii) which is interrupted by an insertion sequence (ORF 13) and two hypothetical proteins with unknown functions (ORF 14 and ORF 15). Southern hybridization analysis have shown that most of the genes from the two operons are found in other At caldus strains #6, “f”, C-SH12 and BC13 from different geographical locations. Expression of the GOGAT-like subunit and the succinate / fumarate-like subunit was demonstrated in At. caldus MNG showing that these genes are functional and actively transcribed. The transcriptional regulator (ORF 2) has been shown to repress the downstream genes of putative operon 1. The persistence of these genes on plasmids together with the fact that they are being expressed, represents a potential metabolic burden, which begs the question why they have been maintained on the plasmid from geographically separated strains (and perhaps also growing under very different nutrient availability conditions) and therefore what possible role they may play.
Reid, Christopher Peter. "The role of accessory minerals in inhibiting bentonite erosion in the geological disposal of higher activity radioactive waste." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27847.
Повний текст джерелаMiles, Andrew James. "Genesis of zoned granite plutons in the Iapetus Suture Zone : new constraints from high-precision micro-analysis of accessory minerals." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7751.
Повний текст джерелаChard, Julian Alexander. "Petrochronology of Accessory Minerals in relation to Metamorphism and Fluid-Flow across the Albany-Fraser Orogen and Eucla Basement, Western Australia." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/85448.
Повний текст джерелаVer, Hoeve Thomas James. "Applications of LA-ICP-MS analysis to zircon : assessing downhole fractionation and pre-treatment effects for U-Pb geochronology and trace element variations in accessory minerals from the Bushveld Complex." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60201.
Повний текст джерелаScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Ahamdach, Noureddine. "Mobilité de l'uranium, du thorium et des éléments de terres rares au cours de l'altération latéritique, de l'infiltration d'eau météorique en milieu granitique et de la diagenèse d'une formation volcano-sédimentaire." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL125N.
Повний текст джерелаAmidon, William Henry. "Cosmogenic ³He and ²¹Ne Dating in Accessory Mineral Phases." Thesis, 2010. https://thesis.library.caltech.edu/5817/2/thesis_final.pdf.
Повний текст джерелаAird, Hannah Mary. "Sulfide and Accessory Mineral Assemblages in the Sulfur-Poor Regions of the Stillwater Complex, Montana, USA." Diss., 2014. http://hdl.handle.net/10161/8737.
Повний текст джерелаLayered igneous intrusions such as the Stillwater Complex in Montana contain the most economic concentrations of platinum-group elements (PGE) in the world, yet the processes involved in the enrichment of these PGE remain unclear. Some researchers propose that the PGE were enriched into sulfide phases through purely magmatic processes, while others postulate that late-stage, high-temperature fluids caused remobilization of the more soluble elements upwards from the base of the crystal pile. Although much work has been carried out on the economic PGE-enriched ore zone (J-M reef), the silicate mineralogy and the bulk geochemistry of the Complex, the detailed petrographic trends have not been investigated. This dissertation comprises a detailed petrographic study into the assemblages associated with sulfide and other trace minerals throughout the stratigraphy.
Sampling was carried out from both surface outcrops and drill cores over four consecutive field seasons. Polished thin sections were produced which were then examined by petrographic microscope and electron microprobe. In addition, bulk rock analysis was carried out by x-ray fluorescence spectrometry (XRF).
In brief, the sulfide and trace mineral assemblage studies described below reveal a number of interesting observations. An upwards trend from pentlandite-rich to pyrrhotite-rich to chalcopyrite + pyrite-rich assemblages is observed below the reef, and the same trend occurs above the reef with the transition occurring just below the reef, in upper GN-I. Trace element analysis shows that Cu levels are higher above the reef than below it, and that although Zn and Cu contents are correlated below the reef, a restricted range of Zn contents occurs above the reef, while Cu is highly variable. As all `low-temperature' assemblages (those associated with extensive silicate alteration or the presence of greenschist facies minerals such as chlorite, clinozoisite and epidote) were discounted, the majority of sulfide assemblages present were either pristine(multiphase, often globular in shape, with no associated silicate alteration) or high-temperature (multiphase, with high-temperature minerals such as biotite, hornblende, carbonates, etc, and with little associated silicate alteration) in occurrence. Some differences were observed between the hanging-wall and footwall rocks, including the presence of native copper, sphalerite in a calcite-hornblende vein, and high-temperature carbonates in footwall and not hanging-wall rocks. The high-temperature carbonates observed comprise dolomite with exsolved patches of calcite. The textural relationships and Fe-Mn compositions of the Stillwater carbonates are similar to those of mantle carbonates. High-temperature desulfidation is also observed both above and below the reef, in the form of pyrite being converted to magnetite, and chalcopyrite to a Cu-Fe-oxide (delafossite). Both sets of assemblages are associated with little to no silicate alteration. When taken together, the upwards increase in Cu and S, the variable Cu contents above the reef, the native copper, high-temperature carbonates and high-temperature sphalerite-bearing veins below the reef, and the evidence for desulfidation are all most readily explained by the remobilization of selected phases by a high-temperature fluid. This dissertation provides evidence that the fluid present in the latter stages of Stillwater formation had a carbonic as well as a Cl-rich component, and would therefore have been efficient in PGE remobilization.
Dissertation
McFarlane, Christopher R. M. "Diffusion, closure temperatures, and accessory mineral petrogeneses in a high-temperature aureole : refining the integration of P-T and t /." Thesis, 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3116116.
Повний текст джерелаLuvizotto, George Luiz [Verfasser]. "Trace element signatures in rutile : characterization of standards and applications to accessory mineral behavior in metamorphic rocks / vorgelegt von George Luiz Luvizotto." 2008. http://d-nb.info/992028906/34.
Повний текст джерелаAlexander, Brian W. Brantley Susan Louise. "Controls on groundwater chemistry in the Cape Cod Aquifer, Massachusetts the impact of accessory mineral phases on solute concentrations, 87sr/86sr, and rare earth element distributions /." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3742/index.html.
Повний текст джерелаReguir, Ekaterina. "Distribution of incompatible trace elements in rock-forming and accessory minerals from carbonatites as a tracer of magma evolution." 2011. http://hdl.handle.net/1993/4761.
Повний текст джерелаWall, Corey J. "Uranium-Lead Geochronology of Granophyres from the Archean Stillwater Complex, Montana (USA): Characterization of Uranium-Bearing Accessory Minerals (Zircon, Titanite, Rutile) and Preliminary Dating Results." 2009. http://hdl.handle.net/2429/6732.
Повний текст джерела