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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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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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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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The structures of the plagioclase felspars. V. The heat-treatment of lime-rich plagioclases
Mineralogical Magazine and Journal of the Mineralogical Society, 1954This work has been primarily concerned with plagioclase felspars within the composition range Ab30An70 to Ab0An100, i.e. felspars with the anorthite-type structure. Some results for less basic specimens will be quoted where appropriate ; a fuller description of the effects of heat-treatments on intermediate plagioclase felspars will be published later.
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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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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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2012
The zoning of plagioclase feldspars was studied with the four-axis universal stage. The composition, in terms of the extinction angle X’ʌ010, ⊥a, was measured for each zone in several crystals in each of nearly fifty rocks. The values of the extinction angles for each zone were plotted against the distance of the zone from the rim of the crystal, and ...
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The zoning of plagioclase feldspars was studied with the four-axis universal stage. The composition, in terms of the extinction angle X’ʌ010, ⊥a, was measured for each zone in several crystals in each of nearly fifty rocks. The values of the extinction angles for each zone were plotted against the distance of the zone from the rim of the crystal, and ...
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Plagioclase-saturated hygrothermobarometry and plagioclase-melt equilibria using machine learning
Goldschmidt2023 abstracts, 2023Kyra Cutler +2 more
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