Electronic Resource
Springer
Contributions to mineralogy and petrology
111 (1992), S. 260-263
ISSN:
1432-0967
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract The reaction fayalite+anorthite=garnet (GAF) has been investigated in a piston-cylinder apparatus and in an internally heated gas apparatus. Piston-cylinder reversals were obtained at 900 °C (6.0–6.4 kbar), 950 °C (6.3–6.8 kbar), 1000 °C (6.6–7.1 kbar), and 1050 °C (7.0–7.3 kbar). Gas-apparatus experiments yielded a reversal at 7 kbar (993–1049 °C). Results are consistent with earlier experimental studies. Unless garnet Ca−Fe mixing is attended by an excess entropy of at least 2–3 J/K-atom, discrepancies remain between calculated and experimentally determined slopes for GAF. The discrepancy is greater if there is no Al−Si disorder in anorthite. High temperature thermodynamic data for almandine and grossular are needed to help resolve this problem.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00348956
|
Location |
Call Number |
Expected |
Availability |
