Mechanisms of hydrothermal crystallization of quartz at 250°C and 15 kbar

Details Mechanisms of hydrothermal crystallization of quartz at 250°C and 15 kbar Mechanisms of hydrothermal crystallization of quartz at 250°C and 15 kbar

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..173m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 2, pp.173-182

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52

Scientific paper

Oxygen isotopic exchange between quartz and water, using a novel technique in which both 18 O/ 16 O and 17 O/ 16 O fractionations were measured, yielded an equilibrium fractionation 18 = 9.0 at 250°C and 15 kbar. The reaction proceeds predominantly by solution of fine grains and growth of larger grains. Exchange by solid-state diffusion is immeasurably slow at this temperature. Under the same experimental conditions, cristobalite behaves quite differently, becoming transformed to sub-micron quartz crystals in a few minutes. The phase transformation is accompanied by a kinetic isotope effect yielding quartz in isotopic disequilibrium with water. It is possible that such disequilibrium products are also formed in other experiments involving phase transitions or mineral syntheses.

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