Electronic Resource
Springer
Contributions to mineralogy and petrology
43 (1974), S. 99-110
ISSN:
1432-0967
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Metamorphic fluorine reactions in silica deficient dolomite have been investigated between 300 and 560° C in the pressure range from 700 to 2000 bars. The equilibrium temperature for the reaction: 1 talc + 7 dolomite + 2 fluorite ⇌ 2 chondrodite + 9 calcite + 5 CO2 + 1 H2O was experimentally determined as a function of the CO2-content of the CO2-H2O gas phase for the total pressure of 2000 bars. The results are given as an isobaric equilibrium curve in the $$T - X_{CO_2 } $$ -diagram of Fig. 2. The equilibrium data were checked and confirmed by reversed reactions. Under the specified pressure conditions the equilibrium temperatures for the above reaction changes from 380° C for very low $$X_{CO_2 } $$ -values to approximately 500° C for $$X_{CO_2 } $$ -values around 0.5, and then remains slightly above 500° C in the $$X_{CO_2 } $$ -interval between 0.5 and 1.0. The temperature conditions for the formation of chrondrodite from tremolite, dolomite, and fluorite are similar to those for the reaction including talc.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00572713
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