Stability of KAlSi3O8 Hollandite-type structure in the Earth's lower mantle conditions

Details Stability of KAlSi3O8 Hollandite-type structure in the Earth's lower mantle conditions Stability of KAlSi3O8 Hollandite-type structure in the Earth's lower mantle conditions

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2735t&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 14, p. 2735-2738

Physics

8

Geochemistry: Composition Of The Mantle, Mineralogy And Petrology: Experimental Mineralogy And Petrology

Scientific paper

The stability of KAlSi3O8 hollandite-type structure is investigated in a series of synthesis experiments between 20 and 95 GPa at 650(+/-50)°C and between 1200 to 2300°C, using electrically- and laser-heated diamond anvil cells, respectively. Potassium feldspar transformed to a hollandite-type structure in the experimental pressure range from 20 to 95 GPa at temperatures between 1200 to 2300°C, whereas it remained amorphous at 65(+/-5) GPa and 650(+/-50)°C. KAlSi3O8 hollandite is, therefore, a stable phase under the pressure and temperature conditions of at least 2200 km deep in the lower mantle and could be an important host for potassium in that region.

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