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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

High-pressure phase transitions of kalsilite and related potassium bearing aluminosilicates

Lin-gun Liu
Geochemical Journal, Vol. 12, No. , P. 275-277, 1978

ABSTRACT

Phase behaviours of kalsilite and its related potassium bearing aluminosilicates (orthoclase and leucite) have been investigated in the pressure region between 120 and 300kbar and at about 1, 000°C in a diamond-anvil press coupled with laser heating. Kalsilite, similar to leucite, has been found to decompose into a mixture of the hollandite-type KAlSi3O8 plus a proposed high-pressure form of KAlO2. The transition was observed at loading pressures greater than 170kbar, and it may be accompanied by a 46% increase in the zero-pressure density. Results of this study show that the hollandite-type KAlSi3O8 is the only so-far-known potassium bearing silicate which is stable under the lower mantle conditions.

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