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Tutti et al. 2001

Tutti, F., Dubrovinsky, L.S., Saxena, S.K. and Carlson, S. (2001). Stability of KAlSi₃O₈ Hollandite-type structure in the Earth's lower mantle conditions. Geophysical Research Letters 28: doi: 10.1029/2000GL012786. issn: 0094-8276.

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. ¿ 2001 American Geophysical Union

BACKGROUND DATA FILES

	Abstract

Keywords
Geochemistry, Composition of the mantle, Mineralogy and Petrology, Experimental mineralogy and petrology

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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