Results 291 to 300 of about 87,697 (345)
Some of the next articles are maybe not open access.
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.
openaire +1 more source
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 ...
openaire +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry
, 1994T. Holland, J. Blundy
semanticscholar +1 more source
A REE-in-plagioclase–clinopyroxene thermometer for crustal rocks
Contributions to Mineralogy and Petrology, 2017Chenguang Sun, Yan Liang
semanticscholar +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source