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Geochimica et Cosmochimica Acta, 1976
Results of experiments investigating the crystallization of plagioclase from natural and synthetic melts are presented and are analyzed in terms of empirical and semiquantitative mixing models for the melt. Elemental partition constants were determined from the results and from other published data.
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Results of experiments investigating the crystallization of plagioclase from natural and synthetic melts are presented and are analyzed in terms of empirical and semiquantitative mixing models for the melt. Elemental partition constants were determined from the results and from other published data.
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An igneous plagioclase thermometer
Contributions to Mineralogy and Petrology, 1970An empirical approach has been taken to develop a geothermometer based on plagioclase-magmatic liquid equilibrium. Compositions of coexisting plagioclase and liquid (glass) obtained by electron microprobe analysis of quenched samples from equilibrium melting experiments of natural granitic rocks at water pressures of 0.5 and 1.0 kilobars have been used
Kudo, Albert M., Weill, Daniel F.
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Cation Diffusion in Plagioclase Feldspar
Science, 1984Steep compositional gradients in igneous plagioclase feldspar from slowly cooled intrusive bodies imply a maximum value of the intracrystalline diffusion coefficient for NaSi ⇄ CaAl exchange, D max ∼10 -20 centimeters squared per second for temperatures in the range 1250° to 1000°C ...
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Tunnelling in plagioclase feldspars
Journal of Physics D: Applied Physics, 2007Electrons trapped in a certain unidentified defect in feldspars can escape it by tunnelling to a nearby site. We show that, for plagioclase feldspars with up to 5% Ca cation (peristerites), the tunnelling rate is directly related to the Ca content. Any explanation must take into account the two-phase nature of such crystals, and three different models ...
D J Huntley, M R Baril, S Haidar
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The structures of the plagioclase felspars: VI. Natural intermediate plagioclases
Mineralogical Magazine and Journal of the Mineralogical Society, 1956SummarySpecimens from some forty different localities over the composition range from about 20 % An to about 70 % An have been examined by X-ray single-crystal methods. The majority of these specimens show the normal intermediate plagioclase pattern characterized by weak pairs of subsidiary layer-lines of variable separation. It has been found that the
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Experimental Deformation Of Plagioclases
1970Strength properties and spatial orientation of deformation structures are de-cribed for 11 plagioclases, An2–An95, deformed in compression tests at 25° — 800°C, 5–10 kb confining pressure. At 800°C 10 kb, all single crystals oriented favorably for albite and pericline twin gliding have yield strengths of about 2 kb regardless of composition or ...
I. Y. Borg, H. C. Heard
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Mineralogical Magazine and Journal of the Mineralogical Society, 1934
During the examination of the basalts of Calciferous Sandstone age which are mapped on the one-inch Sheet 23 (Hamilton, Lanarkshire) Scotland, the peculiarities of zoning exhibited by the porphyritic felspar were studied in some detail. As only a summary of the details is possible in the memoir explanatory of the geology of this Sheet, the description ...
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During the examination of the basalts of Calciferous Sandstone age which are mapped on the one-inch Sheet 23 (Hamilton, Lanarkshire) Scotland, the peculiarities of zoning exhibited by the porphyritic felspar were studied in some detail. As only a summary of the details is possible in the memoir explanatory of the geology of this Sheet, the description ...
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