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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 40 for “"mineral chemistry"”.
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Mineral Chemistry of Heavy Minerals in the Old Hickory Deposit, Sussex and Dinwiddie Counties, Virginia
… largest of a series of Pliocene (?) age heavy mineral sand deposits in Virginia and North Carolina. The high density of heavy minerals allows for selective concentration during transport and deposition. Under the right conditions, placers of considerable size can be formed. The elliptically …
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Some aspects of the mineral chemistry of the peridotite xenolith suite from the Bultfontein Diamond Mine, Kimberley, South Africa
… which are interpreted as metasomatic minerals together with ilmenite, rutile, sulphides, and rare zircon. The variations in texture, mineral chemistry, equilibration conditions and bulk chemistry are described. No diamond-bearing assemblages have been found. The textures vary from …
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CHARACTERIZING THE AURIFEROUS SYSTEM AT PORKY LAKE WITHIN THE PINE LAKE GREENSTONE BELT, NORTHERN SASKATCHEWAN, WITH A FOCUS ON PETROGRAPHY AND MINERAL CHEMISTRY
Gold mineralization occurs within the Pine Lake greenstone belt in several known and prospective deposits in northern Saskatchewan, Canada. The mineralization systematics at some of these locations within the Seabee Gold Operation, including the Porky Main and Porky West deposits, are poorly …
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Petrografia, litoquímica, química mineral e termobarometria de rochas cálcioalcalinas de alto K de textura porfirítica, ediacaranas, no extremo NE da Província Borborema (NE do Brasil)
The mineral chemistry from granites, chemical of whole rock and review of petrography were used to determine the crystallization conditions and the implications in the genesis of high-K calc-akaline granites that are porphyritics, localizated in the Rio Piranhas-Seridó (RPSD) and São José de …
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Petrogenesis of the Spruce Pine pegmatites, North Carolina
… The granodiorite and the pegmatites are mineralogically and chemically identical, indicating that they formed from a common magma. The pegmatites appear to have formed in the granodiorite, becoming larger and more abundant near the margins of the plutons before intruding into the …
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Geochemistry and petrogenesis of kimberlite intrusions from the eastern lobe the Du Toitspan kimberlite pipe, South Africa
… pipe have been analysed for their whole-rock geochemistry and mineral chemistry (olivine and phlogopite) with the aim of developing semi-quantitative models that constrain their petrogenesis and characterise their respective source region(s). Investigated intrusions include; D13-phlogopite …
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An experimental and petrologic investigation of the source regions of lunar magmatism in the context of the primordial differentiation of the Moon
… olivine-hosted melt inclusions, intercumulus mineral assemblages, and cumulus mineral chemistry to argue that the 76535 was altered by metasomatism by a migrating basaltic melt. This process could effectively raise radioisotope systems above their mineral-specific blocking temperatures and …
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Petrological insights into pre- and syn-eruptive degassing at Ambrym volcano, Vanuatu
… time. Petrography, major element modelling, mineral chemistry and dissolved volatile contents indicate that Ambrym is a water-poor, CO2-rich system, characterised chiefly by quiescent convection-driven degassing through two central intracaldera cones. Examination of the 1986 trachyandesite …
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Igneous processes of the early solar system
… presents data that reveal correlations between mineral modal proportions and mineral chemistry that are used to guide experiments and models of ureilite petrogenesis. Chapter 2 details and applies the experimental results to describe ureilite petrogenesis as the result of progressive heating of …
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Nanoscale geochemistry of critical elements; applications for mineral exploration and recovery from secondary sources
… of this thesis is to investigate the nanogeochemistry of critical elements in both mineral exploration and resource recovery contexts. Single particle inductively coupled plasma mass spectrometry (spICP-MS) is employed in Chapter 2 to improve characterization of mineral nanoparticles with …
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Duality of magmatism at Kirkland Lake, Ontario, Canada.
… by mode of emplacement, minerology and geochemistry. Mineral chemistry indicates that rocks from both suites evolved under oxidizing conditions in domains 1 and 3. Rare earth element compositions indicate a similar upper mantle source for both magmatic suites. Major element compositions …
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A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… rare earth element, gold, tin and tungsten, mineralisation in the NE-trending, intracratonic branch of the deeply eroded, Late Proterozoic/Early Palaeozoic, Pan-African Damara Orogen is hosted by meta-arkoses, marbles and metaturbidites in the magmatic arc (Central Zone; CZ) of the orogen, a …
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Planetary Materials Science and Astrobiology
… contain signatures of diverse processes in their mineralogy, chemistry, textures and assemblages. The record contained in planetary materials reflects the complex and commonly overprinting relationships between many processes. Discerning what mechanisms have operated to produce the rocks we …
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Brittle-viscous deformation cycles at the base of the seismogenic zone in the continental crust
… electron backscatter diffraction (EBSD), and mineral chemistry were applied to reconstruct the variations in pressure, temperature, fluid pressure, and differential stress that mediated deformation and strain localization along BFZ045 across the BDTZ. Ductile deformation took place at 400-500° …
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Platinum-group element mineralisation in the Shetland ophiolite complex
… which are unusual in ophiolites. Aspects of this mineralisation suggest both magmatic and hydrothermal concentration processes, although neither individually explain the observed paragenesis. This study examines the distribution of PGE within a representative fresh vertical section of the …
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Geochemical properties of the Beni Bousera (N. Morocco) peridotites : a field and laboratory approach to understanding melt infiltration and extraction in an orogenic peridotite massif
… a new dataset comprised of whole rock and mineral chemistry data that is used to suggest the massif is more heterogeneous than previously interpreted, and that "secondary" peridotites and dunites were formed by different petrogenic processes than the remainder of the massif. Trends in the …
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The Middle Fork Plutonic Complex: a plutonic association of coeval peralkaline and metaluminous magmas in the north-central Alaska Range
… and assimilation. Trends in whole rock and mineral chemistry also reflect interactions between the magmas. Consanguinous hypersolvus syenite and AF granite mineralogy appears to be controlled by fluorine in the magma chamber. Magmatic mineral assemblages reflect increasingly reduced magmatic …
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The record of magma storage conditions in mineral compositions below a glacial to ice-free Askja volcano, Iceland
… units. The purpose of this study was to use mineral compositions and textures from basaltic lavas to reconstruct magma chamber conditions before, during and after glaciation. In this study, 36 lava flow and gabbro xenolith samples were collected from seven separate units: two glacial, the …
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