Title: Strontium diffusion in sanidine and albite, and general comments on strontium diffusion in alkali feldspars
Abstract: Strontium chemical diffusion has been measured in albite and sanidine under dry, 1 atm, and QFM buffered conditions. Strontium oxide-aluminosilicate powdered sources were used to introduce the diffusant and Rutherford Backscattering Spectroscopy (RBS) used to measure diffusion profiles. For the 1 atm experiments, the following Arrhenius relations were obtained:Sanidine(Or61),temperaturerange725−1075°C,diffusionnormalto(001):D=8.4exp(−450±13kJmol−1/RT)m2s−1.Albite(Or1),temperaturerange675−1025°C,diffusionnormalto(001):D=29×10−9exp(−224±11kJmol−1/RT)m2s−1.The alkali feldspars in this and earlier work display a broad range of activation energies for Sr diffusion, which may be a consequence of the thermodynamic non-ideality of the alkali feldspar system and/or the mixed alkali effect.
Publication Year: 1996
Publication Date: 1996-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 50
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