Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.5037c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 24, pp.5037-5043
Physics
5
Scientific paper
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 ( Or 61 ), temperature range 725-1075° C , diffusion normal to (001): D =8.4 exp (-450±13 kJ mol -1 /RT) m 2 s -1 . Albite ( Or 1 ), temperature range 675-1025° C , diffusion normal to (001): D =2.9 × exp (-224±11 kJ mol -1 /RT) m 2 s -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.
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