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Knowledge of oxygen diffusion in garnet is crucial for a correct interpretation of oxygen isotope signatures in natural samples. A series of experiments was undertaken to determine the difusivity of oxygen in garnet, which remains poorly constrained. The first suite included high-pressure (HP), nominally dry experiments performed in piston-cylinder apparatus at: (1)  T  = 1050–1600 °C and  P  = 1.5 GPa and (2)  T  = 1500 °C and  P  = 2.5 GPa using yttrium aluminum garnet (YAG; Y 3 Al 5 O 12 ) cubes. Second, HP H 2 O-saturated experiments were conducted at  T  = 900 °C and  P  = 1.0–1.5 GPa, wherein YAG crystals were packed into a YAG + Corundum powder, along with  18 O-enriched H 2 O. Third, 1 atm experiments with YAG cubes were performed in a gas-mixing furnace at  T  = 1500–1600 °C under Ar flux. Finally, an experiment at  T  = 900 °C and  P  = 1.0 GPa was done using a pyrope cube embedded into pyrope powder and  18 O-enriched H 2 O. Experiments using grossular were not successful.

american mineralogist

Oxygen diffusion in garnet: Experimental calibration and implications for timescales of metamorphic processes and retention of primary O isotopic signatures