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• W1974575744 abstract "Oxygen self-diffusion in natural calcite single crystals was studied hydrothermally at 400–800°C and 10–350 MPa confining pressure. Diffusion coefficients (D) were determined from18O concentration profiles measured with an ion microprobe. At 100 MPa confining pressure, the Arrhenius parameters yield an activation energy (Q) = 173 ± 6 kJ/mole and pre-exponential factor (D0) = 7 × 10−9 m2/s over the temperature range 400–800°C, and there is no measurable anisotropy. Constant temperature experiments at 700°C indicate that there is a strong linear correlation (slope = 0.9) of D with water fugacity over the range 4–240 MPa, consistent with the interpretation that, in the presence of water, the dominant oxygen-bearing transport species in calcite is molecular water. A sample containing 1180 ppm Mn shows a marked increase in observed D values at temperatures below ∼ 600°C. However, when pre-annealed at ⩾ 700°C the D values obtained at 550°C are within a factor of four of the value obtained for the low (100 ppm) Mn sample. The results of this study confirm that in contrast to carbon, oxygen diffusion rates in calcite are greatly enhanced when water is present. The difference in the effect of water on Doxygen and Dcarbon in calcite may provide valuable information for evaluating the role of fluids in the thermal histories of calcite-bearing rocks." @default.
• W1974575744 created "2016-06-24" @default.
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• W1974575744 date "1994-02-01" @default.
• W1974575744 modified "2023-10-16" @default.
• W1974575744 title "Oxygen self-diffusion in calcite: Dependence on temperature and water fugacity" @default.
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• W1974575744 doi "https://doi.org/10.1016/0012-821x(94)90092-2" @default.
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