Precise determinations of the equilibria kyanite <--> sillimanite and kyanite <--> andalusite and a revised triple point for Al2SiO5 polymorphs
American Mineralogist
By: Steven R. Bohlen, Art Montana, and Derrill M. Kerrick
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Abstract
Investigates the equilibria kyanite ??? sillimanite and kyanite ??? andalusite using the piston-cylinder apparatus to refine the phase relationships among Al2SiO3 polymorphs. Experiments at the US Geological Survey constrain the kyanite ??? sillimanite equilibrium to 14.3-14.6, 11.4-11.7, 9.5-10.0, and 6.0-6.5 kbar at 1000, 900, 800, and 600??C, respectively. At UCLA, experiments limite the equilibrium to 14.4-14.6, >12.9, 11.8-12.2 and 7.0-8.0 kbar at 1000, 950, 900, and 700??C, respectively. The equilibrium kyanite ??? andalusite was reversed between 7.4 and 8.0 kbar, 800??C at UCLA. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Precise determinations of the equilibria kyanite <--> sillimanite and kyanite <--> andalusite and a revised triple point for Al2SiO5 polymorphs |
| Series title | American Mineralogist |
| Volume | 76 |
| Issue | 3-4 |
| Year Published | 1991 |
| Language | English |
| Publisher | Mineralogical Society of America |
| Description | 4 p. |
| First page | 677 |
| Last page | 680 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |