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Showing 1 to 20 of 46 for “"Silicate minerals"”.
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Thermal Transformations in Some Layer Silicate Minerals
Made available in DSpace on 2014-12-04T19:13:19Z (GMT). No. of bitstreams: 1 0004018.pdf: 3823742 bytes, checksum: 9021f0d070a16c286831ba2acd916168 (MD5) Previous issue date: 1952
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The structures and crystal chemistry of the aluminum-silicate minerals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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Determination of sodium in silicate minerals by neutron activation analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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Sugilite and associated metamorphic silicate minerals from Wessels Mine, Kalahari manganese field
… horizons and the formation of zoned silicate-mineral assemblages. The presence of unusual minerals such as glaucochroite, iron akermanite, xonotlite and hydrogarnets of various types constrains the main phase of metamorphism to between 400 and 450 °C in a low pressure, hydrous …
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The interaction between silicate minerals and C-O-H bearing melts in the Earth's mantle
… dissociation of H2O to OH- bonded to melt silicate components at these conditions, although results for forsterite at 13 GPa are inconclusive due to uncertainties in the dry melting temperature. This simple model is unsuccessful in predicting the depression of melting temperature due to H2O …
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A chemical study of the silicate minerals of the Great Gossen Lead and surrounding rocks in southwestern Virginia
… found in the ore zone. The ferromagnesian minerals show marked iron depletion within 2-5 feet of the sulfide ore. Ore zone chlorite and biotite show a significant increase in magnesium; garnets show a similar increase in manganese. The cores of garnets from the ore zone show the influence …
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The kinetics and thermodynamics of clay mineral reactions
… high surface area, and reactivity clay minerals are important participants in the diagenesis of clastic rocks. The kinetic and thermodynamic stability of clays is in general poorly understood. This dissertation research measured the rate of transformation of kaolinite to muscovite/illite …
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Electron donor contributions to denitrification in the Elk Valley Aquifer, North Dakota
… carbon (OC), pyrite (FeS2), and ferrous iron silicate minerals. In the EVA tracer tests, increases in sulfate indicated that the oxidation of pyrite explained a significant of the denitrification. The contributions of the three electron donors varied between tests and from test to test with …
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Stable isotope geochemistry of the Okenyenya igneous complex, Namibia : constraints on contamination and fluid interaction
The δ¹⁸O values of coexisting silicate minerals in rocks comprising the tholeiitic olivine gabbro - quartz monzodiorite suite, are consistent with the attainment of isotope equilibrium and largely closed system conditions. The majority of the temperatures calculated by conventional mineral-pair …
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Effect of Cooling Rates on Mineralization in Portland Cement Clinker
… variables that has a significant impact on the minerals produced during the cement making process. The goal of the industry has been to produce cement clinker containing minerals that are highly reactive with water. Highly reactive clinker minerals will equate to improved mortar strength and …
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Assessment of the potential carbon footprint of engineered processes for the mineral carbonation of PGM tailings
… that entails the reaction of CO2 with oxides or silicates of magnesium, calcium or iron to produce stable carbonate compounds. Magnesium-rich tailings from the platinum industry in South Africa have been identified as a potentially viable and attractive feedstock for CO2 sequestration through …
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Petrofabric investigation of the sulfide-rich basal zone of the Duluth Complex
… that crystallographic preferred orientations of silicate minerals are generally subparallel to magnetic lineations, confirming the magmatic origin of the magnetic fabric. X-ray computed tomography (XCT) reveals that, where silicate minerals are well-aligned, sulfides form interconnected, …
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Investigating the use of sodium metasilicate to improve the flotation performance of altered PGE ores
… ores worldwide. This is because the phyllosilicate minerals derived from hydration reactions of silicate minerals (i) form electrostatic coatings on valuable minerals that in turn hinders collector adsorption, (ii) alter the viscosity of the slurry leading to poor gas dispersion and (iii) …
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Nitrogen cycling in young mine soils in Southwest Virginia
… to plants. The geologic N came from either 2:1 silicate minerals (fixed NH₄<sup>+</sup>) or coal fragments (nonhydrolyzable organic N). Active N, consisting of hydrolyzable organic N and exchangeable N, comprised the minor fraction of indigenous N available to plants.
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ΠΑΡΑΛΑΒΗ ΜΟΡΦΩΝ ΑΡΓΙΛΙΟΥ ΤΟΥ ΕΔΑΦΟΥΣ (ΝΕΑ ΜΕΘΟΔΟΣ ΜΕ ΠΥΡΟΚΑΤΕΧΙΝΗ)
… SAMPLES OF AMORPHOUS ALUMINUM HYDROXIDES, SILICATE MINERALS AND ACID SOILS WERE TREATED REPEATEDLY WITH 50 ML OF 0,1M SOLUTION OF CATECHOL AT 80 CIN THE PRESENCE OF 1ML 5% NH3.THE EXTRACTED QUANTITIES OF AL AND FE WERE COMPARED WITH THOSE EXTRACTED BY THE CBD METHOD. THE RESULTS OF THE …
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An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa
… a natural process whereby CO₂ is fixed to CaFeMg-silicates to form Ca-, Fe-, and Mg-carbonates. This process is thermodynamically favourable and the products are benign and stable over millions of years. Pyroxene-rich tailings generated from the processing of PGM ores in South Africa have the …
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Solute Chemistry and Isotopic Investigation of the Groundwater Flow Paths in Honey Lake Basin, Lassen County, California and Washoe County, Nevada
… terrains to lacustrine sediments with evaporite minerals, in a closed basin environment. Temperature data reveal that thermal waters circulate to 1.6-3.0 km and 2.8-3.8 km along two major fault zones. Shallow groundwaters above 17°C are determined to have a component of thermal water and mixing …
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Boron metasomatism in the Alta stock contact aureole, Utah
… by a variety of metamorphic and metasomatic silicate minerals (forsterite and humite group are the most significant). Aureole whole-rock B concentrations increase toward the contact, indicating that B originated in the stock and migrated down-temperature in exsolved magmatic fluids. Boron …
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Analysis of a room temperature partial extraction technique for heavy metals from soils
… at extended contact times were found to attack silicate minerals, but solutions stronger than have previously been used may be utilized without damage to the soil structure. Extractions utilizing heat and concentrated acids were too destructive to be considered true partial extractions.
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