Other
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89..115g&link_type=abstract
Earth and Planetary Science Letters, Volume 89, Issue 1, p. 115-122.
Other
8
Scientific paper
The diffusion rate of oxygen in magnetite (Fe3O4) has been measured under hydrothermal conditions between 800° and 500°C at 1000 bars pressure, and yields the Arrhenius relation: D = 3.5 × 10-6 exp(-45,000/RT) kcal/g-atom O. The diffusion rate was found to be the same, within the estimated uncertainty of a factor of 2, for measurements at 100, 1000, and 2000 bars (20-200 MPa) water pressure, and for oxygen fugacities buffered by magnetite-hematite and approximately Ni-NiO. The activation energy and diffusion mechanism probably change to that given by Castle and Surman [10] at temperatures below 460°C. The oxygen diffusion rate in magnetite is between those of quartz and hornblende. Closure temperatures fall in the range 380°C for 0.1 mm radius grains cooling at 1°C/m.y. to 675°C for 1 mm radius and cooling at 1000°C/m.y. if the present data are used, but will be lower for the fine grain sizes and slow cooling rates if the Castle and Surman data are used.
Giletti Bruno J.
Hess K. C.
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