Grain boundary diffusion of oxygen, potassium and calcium in natural and hot-pressed feldspar aggregates
Article Abstract:
A study of the grain boundary diffusion rates of oxygen, potassium and calcium in powdered, natural or hot-pressed feldspar quantities revealed variations in formal charge and/or size of diffusing elements as significant influences on diffusion levels of the relative grain boundaries. Oxygen grain boundary diffusion rates were identical in both the natural and hot-pressed rocks, while potassium and calcium had varying diffusion coefficients, suggesting the presence of alternate diffusional transport mechanisms such as connected fluid-filled channels for regulating diffusion rates.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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Oxygen diffusion in anhydrous sanidine feldspar
Article Abstract:
Investigation of anhydrous oxygen diffusion in sanidine feldspar was conducted via oxygen exchange experiments. Single crystals of sanidine feldspar and oxygen gas enriched in oxygen isotope 18 were studied at the temperature range of 869-1053 degrees Celsius, total pressure 1 atmosphere, for 28 days. The experimental data obey a single Arrhenius relationship. Results indicate that oxygen diffusion in anhydrous sanidine feldspar is marginally slower than oxygen diffusion in anhydrous anorthite. These suggest that oxygen transport in feldspar is by an interstitial mechanism.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Argon diffusion domains in K-feldspar II: kinetic properties of MH-10
Article Abstract:
A sample of MH-10 alkali feldspar was step heated to 850 degrees Centigrade and split.The results of the study confirmed earlier conclusions on the correlation between the MH-10 age spectrum and Arrhenius plots that the argon diffusion boundaries generated in the laboratory and in nature are consistent. Thermal histories calculated from adjacent samples with variable kinetic parameters supported this conclusion. It was also suggested that laboratory heating did not alter sample diffusion behaviors or affect the thermal reconstruction.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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