Me. Kooi et al., THE SYSTEM CO2-N-2 AT HIGH-PRESSURE AND APPLICATIONS TO FLUID INCLUSIONS, Geochimica et cosmochimica acta, 62(16), 1998, pp. 2837-2843
Postulated fluid-fluid immiscibility of 50-50% CO2-N-2 mixtures has be
en checked by high-pressure experiments (<5 GPa; <400 K) and could be
rejected. The implications for the interpretation of high-density flui
d inclusions (<42 cm(3)/mole) in eclogite and granulite-facies rocks a
re discussed: only models based on LG-immiscibility are applicable for
molar volume calculations also in the very-high-pressure range. The p
osition of the critical curve for CO2-N-2 could be more accurately det
ermined with the help of experimental and fluid inclusion data. The S-
2-F isopleth and the three-phase (S1S2F) line have been established fo
r 50.6% N-2 composition. Copyright (C) 1998 Elsevier Science Ltd.