Other
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..657g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 5, pp.657-673
Other
4
Scientific paper
Optical and analytical studies were performed on 400 N 2 + CO 2 gas bearing inclusions in dolomites and quartz from Triassic outcrops in northern Tunisia. Other fluids present include brines (NaCl and KCl bearing inclusions) and rare liquid hydrocarbons. At the time of trapping, such fluids were heterogeneous gas + brine mixtures. In hydrocarbon free inclusions the N 2 /( N 2 + CO 2 ) mole ratio was determined using two different non-destructive and punctual techniques: Raman microprobe analysis, and optical estimation of the volume ratios of the different phases selected at low temperatures. In the observed range of compositions, the two methods agree reasonably well. The N 2 + CO 2 inclusions are divided into three classes of composition: (a) N 2 /( N 2 + CO 2 ) > 0,57: Liquid nitrogen is always visible at very low temperature and homogenisation occurs in the range -151°C to - 147°C (nitrogen critical temperature) dry ice (solid CO 2 ) sublimates between -75°C and -60°C; (b) 0,20 < N 2 /( N 2 + CO 2 ) 0,57: liquid nitrogen is visible at very low temperature but dry ice melts on heating; liquid and gas CO 2 homogenise to liquid phase between -51°C to -22°C; (c) N 2 /( N 2 + CO 2 ) 0,20: liquid nitrogen is not visible even at very low temperature (-195°C) and liquid and gas CO 2 homogenise to liquid phase between -22°C and -15°C. The observed phases changes are used to propose a preliminary phase diagram for the system CO 2 -N 2 at low temperatures. Assuming additivity of partial pressures, isochores for the CO 2 -N 2 inclusions have been computed. The intersection of these isochores with those for brine inclusions in the same samples may give the P and T of trapping of the fluids.
Dhamelincourt P.
Guilhaumou Nicole
Touray Jean Claude
Touret J.
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