Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2947c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 11, pp.2947-2951
Physics
7
Scientific paper
The self-diffusion of oxygen has been measured in an FeTi basalt melt at one atmosphere from 1320-1500°C under different oxygen fugacities. Diffusivities were determined by measuring isotopic exchange between spheres of melt and flowing oxygen in a vertical tube furnace. The oxidation state of the melt was varied by performing experiments in either O 2 or CO 2 gas. The diffusion data for experiments in both gases can be fit to the equation D = 1.4 × 10 exp (-60(±7) × 10 3 / RT ) cm 2 / s . The observed self-diffusivities for oxygen in the basalt melt are one to two orders of magnitude lower than published chemical diffusivities at one atmosphere. Diffusivities in basalt melt at each temperature in O 2 and CO 2 gas are similar within experimental error ( 0.2 log D units at the 1 level) and indicate that oxygen self-diffusion is insensitive to the oxidation state of Fe in natural basalt melts. The redox independence of oxygen self-diffusion observed in this study suggests that oxygen transport in natural magmas will not be significantly affected by changes in their redox state caused by degassing and/or crystallization.
Canil Dante
Muehlenbachs Karlis
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