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- W7113553 abstract "The effect of pressure on the rate of Al/Si disorder in microcline has been determined at temperatures from 750°C to 900°C and at pressures up to 28 kbar using samples dried at 850°C in Pt capsules prior to sealing. The presence of any water would induce melting, and none was observed. The effect of pressure in the presence of hydrogen is profound in experiments done in piston-cylinder devices using NaCl pressure medium, as has also been observed with albite. The enhanced Al/Si diffusion is even more marked than in albite, although a somewhat higher threshold pressure is necessary to attain fairly rapid rates of Al/Si interchange; disorder is very slow in this temperature range at pressures below 9-10 kbar. At 1050°C and one atmosphere, an authigenic microcline from the Kona dolostone is hardly changed in six weeks. At 900°C and 28 kbar it is disordered in less than two hours. As in the case of albite, the presence of hydrogen is essential for the enhanced diffusion at high pressures; if deprived of hydrogen by replacing the NaCl pressure medium with (anhydrous) glass, or by surrounding the sample with a hydrogen getter such as , the reaction is greatly inhibited. A mechanism involving proton-activated transient coordination increase in which Si-O and Al-O bonds are broken is suggested. The disordering transformation at high pressures takes place as a heterogeneous two-phase reaction, related to low-temperature hydrothermal disordering and unlike the homogeneous change observed at ~1050-1100°C at one atmosphere. This behavior, unlike the homogeneous process in albite, is suggestive of a first-order microcline-sanidine inversion. The hydrogen-enhanced diffusion may be akin to the observed hydrolytic weakening in quartz and olivine and may have ramifications on the rheological behavior of deep crustal and upper mantle rocks. It is suggested that, in the absence of hydrothermal fluids, fluid inclusions may be formed in anhydrous rocks and structural equilibration induced by the presence of hydrogen." @default.
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- W7113553 date "1988-03-01" @default.
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- W7113553 title "Enhanced Al/Si Diffusion in KAlSi<sub>3</sub>O<sub>8</sub>at High Pressures: The Effect of Hydrogen" @default.
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- W7113553 doi "https://doi.org/10.1086/629204" @default.
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