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Showing 1 to 20 of 52 for “"Feldspars"”.
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Phase equilibrium investigation of ternary feldspars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1987.
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Alkali feldspars: ordering, composition and optical properties
… </table> Tested by the data from 109 alkali feldspars in the literature and the author's experiments, this model estimates Σt₁ (given X<sub>Or</sub> and V<sub>x</sub>) with a standard error of 0.02, which is essentially the same as when Σt₁ is estimated from refined lattice parameters …
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K, Na distribution and unit cell parameters of alkali feldspars.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Structural variations of feldspars at high pressure and high temperature
… of phase boundaries and reactions involving feldspars in the Earth's crust. Until recently, no systematic approach has been applied to describe the structural behavior of feldspars as a function of pressure, temperature and composition. In this thesis, high-pressure and high-temperature X-ray …
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Solid State Formation of Barium, Strontium, and Lead Feldspars in Clay - Sulfate Mixtures
Made available in DSpace on 2014-12-04T19:14:10Z (GMT). No. of bitstreams: 1 6104381.pdf: 2667446 bytes, checksum: 616cfbc65a7df5328a0a4440ae5816c7 (MD5) Previous issue date: 1961
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Trace element behaviour in a LCT-pegmatite with rare-element mineralization : the Luolamäki pegmatite, a case study
… three other salient rock-forming mineral groups, feldspars, micas and tourmalines were chosen for analysis. The Luumäki pegmatite is classified as belonging to the LCT-family and being of the petalite-subtype. The previous assumptions of the pegmatites asymmetric inner structure were confirmed …
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The Semliki Basin, Uganda : its sedimentation history and stratigraphy in relation to petroleum accumulation
… are predominantly composed of quartz, potassium feldspars and plagioclase feldspars with subordinate clay minerals. Accessory minerals, such as micas (biotite and muscovite), heavy minerals, garnet and epidote, are present in minor amounts. This mineralogy indicates that the sediments have a …
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Exploration and application of post-infrared high-temperature infrared stimulated luminescence dating techniques: investigation of marine terrace deposits along the northern San Andreas Fault
… receiving significantly more attention than feldspars until the past decade. Recent research has improved the practicality of using feldspars as a reliable dosimeter –an appealing notion as the intrinsic properties of feldspars allow them to date older sediment that may lie beyond the …
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Solid State Nuclear Magnetic Resonance of Quadrupolar Nuclei (Nmr)
… of geologic and chemical interest including feldspars, phyllosilicates, zeolites and aluminas. High magnetic field strengths (8.5 T) and Magic Angle Sample Spinning (MASS) yield high resolution spectra for quadrupolar nuclei with odd integral nuclear spins. Among the nuclei studied are …
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Authigenic analcite in the Golden Valley Formation southwestern North Dakota
… The abundances of analcite and the detrital feldspars are inversely related.</p> <p>Analcite composition, distribution with respect to the feldsparas, presence of sericite, and the absence of a vitroclastic texture, suggests that analcite in the arkose was derived from a post-depositional …
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Quantification of swelling clays in mineral mixtures and rocks using infrared spectroscopy.
… contained relatively high concentrations of feldspars and clays, accurately, with all components predicted within +/-2.8 wt%. PLS model was optimized in order to obtain more accurate quantification of components in the sandstones, in particular for the "cleaner" sandstones, i.e. those which …
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The Elastic Behavior of Plagioclase Feldspar at High Pressure
Feldspars are one of the archetypical families of framework silicates. They not only comprise around 60% volumetrically of the Earth's crust, but are among some of the most structurally complicated minerals. Investigation into the structural behavior of various intermediate plagioclases at pressure …
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Role of Li and B bearing fluids in crystallization and alteration of granitic pegmatites, San Diego, California
… quartz, elbaite tourmaline, and spodumene. Feldspars in pockets are usually altered to kaolinite. This study investigates the role that fluid-soluble elements, Li, B, Cl, and F, have in controlling the mineralogy of pegmatites and subsolidus alteration includes two of these pegmatites: the …
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The relationship of the Yucca Mountain repository block to the regional groundwater system: A geochemical model
… consisted of zeolites, smectites, authigenic feldspars and quartz polymorphs from described diagentic mineral zones. Reaction steps were ion exchange with zeolites. (Abstract shortened with permission of author.).
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Petrogenesis of the Springfield Granodiorite, southeast Pennsylvania Piedmont
… zircon. The magmatic assemblage of quartz+two feldspars+biotite+sphene+hornblende+magnetite permits its utilization of AI-in-hornblende as a geobarometer (Schmidt, 1992) and yields a pressure estimate of 9 kbars. The initial 87Sr/86Sr ratio of 0.708, suggests an evolved source for the magma …
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Characterization of Quarry By-Products as a Partial Replacement of Cement in Cementitious Composites
… may be reactions with the various clays and feldspars in the quarry by-products with calcium hydroxide, which suggests a degree of reactivity that is not necessarily pozzolanic or hydraulic.
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Studies of Magmatic Systems
… crystallization mainly of pyroxene and feldspars. These data and the results from the modeling, suggest a genetic link between the Ponza trachyte and coeval alkali olivine basalts on the nearby Ventotene Island. 2) We evaluated the range of magmatic temperatures within the …
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Intensive parameters of a sulfide and aluminosilicate-bearing granite, Hancock County, Maine
… phases such as andalusite and fibrolite. Feldspars have been partially altered to muscovite, and biotite has partially altered to chlorite. Sulfides and tourmaline appear to have formed late in the crystallization sequence. Prior to the intrusion of the Lucerne the fine-grained granite …
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