Stability of KAlSi₃O₈ hollandite-type structure in the earth's lower mantle conditions

Summary, in English

The stability of KAISi₃O₈ 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. KAISi₃O₈ 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.

• Författare: F. Tutti; L. S. Dubrovinsky; S. K. Saxena; S. Carlson
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2001-07-15
• Språk: Engelska
• Sidor: 2735-2738
• Publikation/Tidskrift/Serie: Geophysical Research Letters
• Volym: 28
• Issue: 14
• Länkar: http://dx.doi.org/10.1029/2000GL012786
• Dokumenttyp: Artikel i tidskrift
• Förlag: American Geophysical Union (AGU)
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0094-8276