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Experimental determination of melting relationships of beryl in the system BeO-Al2O3-SiO2-H2O between 10 and 25 kbar
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Titel: |
Experimental determination of melting relationships of beryl in the system BeO-Al2O3-SiO2-H2O between 10 and 25 kbar |
In: | Mineralogical Magazine, 50, 1986, 355, S. 55-61 |
veröffentlicht: |
Mineralogical Society
|
Umfang: | 55-61 |
ISSN: |
0026-461X 1471-8022 |
DOI: | 10.1180/minmag.1986.050.355.08 |
Zusammenfassung: | <jats:title>Abstract</jats:title><jats:p>The onset of melting of beryl + H<jats:sub>2</jats:sub>O was determined experimentally in the <jats:italic>P-T</jats:italic> range 10–25 kbar, 900 to 1200°C, by synthesis runs on the composition Al<jats:sub>2</jats:sub>Be<jats:sub>3</jats:sub>Si<jats:sub>6</jats:sub>O<jats:sub>18</jats:sub>. Beryl begins to melt incongruently to chrysoberyl, phenakite, and melt at temperatures slightly above 1000°C. At higher temperatures a divariant stability field exists where beryl, chrysoberyl, phenakite, and melt coexist due to the solubility of H<jats:sub>2</jats:sub>O in beryl and in the melt. The final disappearance of beryl was bracketed between 1050 and 1100°C at 10 kbar and at 1100°C between 10 and 20 kbar. The phases (analysed for Al and Si by electron microprobe) do not show major deviation from stoichiometric composition.</jats:p> |
Format: | E-Article |
Quelle: | Mineralogical Society (CrossRef) |
Sprache: | Englisch |