Abstract / Description of output
The diffusion rate of O tracer atoms in anorthite (AnAb) under anhydrous conditions has been measured using SIMS techniques. The tracer source was O 98.4% gas at 1 bar, in the temperature range 1300° C-850° C. The measured diffusion constants are D=1×10 msQ=236±8 kJ mol Comparison of these values with published data for O diffusion in anorthite under hydrothermal conditions shows that "dry" oxygen diffusivities are orders of magnitude lower than equivalent "wet" values at similar temperatures. The effect of these differences on oxygen isotope equilibration during cooling is discussed.
Original language | English |
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Pages (from-to) | 490-495 |
Number of pages | 6 |
Journal | Contributions to Mineralogy and Petrology |
Volume | 100 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Dec 1988 |