Pressure-Enhanced Al/Si Diffusion and Oxygen Isotope Exchange

  • Julian R. Goldsmith
Chapter
Part of the Advances in Physical Geochemistry book series (PHYSICAL GEOCHE, volume 8)

Abstract

A number of experimentalists working in mineralogical systems have been aware of enhanced reactions at elevated pressures, although little comment exists in the literature. In working with carbonate systems in the opposed anvil, “simple squeezer” device (e.g., Goldsmith and Graf, 1960), initially rapid reaction rates were noted and assumed to be largely a result of shear stresses and intimate contact (compaction), produced by the externally applied high pressure. This explanation does not apply, however, to hydrostatic hydrothermal systems, and Goldsmith and Newton (1974) found that reversed equilibria of the alkali feldspar solvus below 600 °C could not be attained in reasonable laboratory times at \({{\text{H}}_{\text{2}}}{\text{O}}\) less than approximately 9 kbar, but that it was readily achieved at pressures of 10 kbar or more. Smith and Parsons (1974) reversed the solvus at 1 kbar in runs of > 2300 h, but the brackets are not tightly constrained. Reaction rate differences at 1 and 9 kbar H20 pressure are striking.

Keywords

Oxygen Isotope Oxygen Exchange Molecular Water Plagioclase Feldspar Proton Activity 
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  • Julian R. Goldsmith

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