Other
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1275b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1275-1283
Other
4
Scientific paper
The NH + 4 and K + distribution between phlogopite and a chloride vapour phase was investigated at 550°C and 2000 bars. Some preliminary data are reported for 650°C and 2000 bars. The apparent distribution coefficient, K * D = ( NH + 4 / K + ) phlogopite p , t ( NH + 4 K + ) vapour 1 bar , 25° C , is 1.29 ± 0.30 at 550°C and 1.44 ± 0.20 for the preliminary data at 650°C. At 550°C a series of runs was performed to study the equilibration time of the exchange reaction. Bulk compositions requiring a large change in solid composition did not equilibrate within 28 days, indicating a rather sluggish reaction mechanism. The extrapolation to low NH + 4 concentrations in natural rock systems may provide estimates of NH + 4 concentrations for metamorphic fluids in equilibrium with NH + 4 bearing minerals. The assumption that Rb + behaves similarly to NH + 4 allows a rough estimate of the distribution coefficients for NH + 4 in other minerals. Semiquantitative modelling based on the derived distribution coefficients of NH + 4 and Rb + may elucidate fluid / rock equilibria during closed system behaviour. The release of nitrogen by breakdown of NH 4 -bearing biotite during prograde or retrograde processes in metamorphic rocks may explain the presence of N 2 -gas in fluid inclusions.
Bos Ariejan
Duit Willem
Jansen Ben H. J.
van der Eerden Ad M. J.
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